Samacheer Kalvi Class 12 Bio Botany Solutions Chapter 8 Environmental Issues

12th Bio Botany Guide Environmental Issues Text Book Back Questions And Answers

I. Choose The Correct Answer

 

Question 1. Which of the following would most likely help to slow down the greenhouse effect.
(a) Converting tropical forests in to grazing land for cattle.
(b) Ensuring that all excess paper packing is buried to ashes.
(c) Redesigning landfill dumps to allow methane to be collected.
(d) Promoting the use of private rather than puplic transport.
Answer: (c) Redesigning landfill dumps to allow methane to be collected.
In simple words: Collecting methane from landfills prevents this strong greenhouse gas from going into the air. Methane is a potent greenhouse gas, and capturing it helps reduce its impact on global warming.

🎯 Exam Tip: Remember that reducing greenhouse gas emissions is key to slowing down the greenhouse effect. Identify actions that either prevent gas release or remove gases from the atmosphere.

 

Question 2. With respect to Eichhornia. Statement A: It drains off oxygen from water and is seen growing in standing water. Statement B: It is an indigenous spicies of our country.
(a) Statement A is correct and Statement B is wrong.
(b) Both Statements A and B are correct.
(c) Statement A is correct and Statement B is wrong.
(d) Both Statements A and Bare wrong.
Answer: (a) Statement A is correct and Statement B is wrong.
In simple words: Statement A is true because Eichhornia, or water hyacinth, takes oxygen from water and grows in still water. Statement B is false because Eichhornia is actually an alien species, not native to our country. This makes it an invasive plant that harms local ecosystems.

🎯 Exam Tip: When evaluating statements, break them down and check each part for accuracy. Invasive species like Eichhornia are often problematic due to their rapid growth and impact on native flora and fauna.

 

Question 3. Find the wrongly matched pair.
(a) Endemism - Species confined to a region and not found anywhere else.
(b) Hotspots - Western ghats.
(c) Ex-situ Conservation - Zoological parks.
(d) Sacred groves - Saintri hills of Rajasthan.
(e) Alien sp. Of India - Water hyacinth.
Answer: (e) Alien sp. Of India - Water hyacinth.
In simple words: Water hyacinth is indeed an alien species in India, but the question asks for the *wrongly* matched pair. All other options are correctly matched. Water hyacinth is an invasive species, meaning it is not native and can cause harm to the environment.

🎯 Exam Tip: Pay close attention to keywords like "wrongly matched" to ensure you select the incorrect association, not the correct one.

 

Question 4. Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?
(a) Ammonia
(b) Methane
(c) Nitrous oxide
(d) Ozone
Answer: (d) Ozone.
In simple words: The ozone layer protects Earth from harmful ultraviolet (UV) radiation. When the ozone layer becomes thinner, more UV rays reach the surface, which can cause skin cancer in people. Ozone depletion is a serious environmental issue.

🎯 Exam Tip: Understand the role of the ozone layer in protecting life on Earth and the consequences of its depletion, such as increased UV radiation and health risks.

 

Question 5. One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as
(a) \( \text{N}_2\text{O} \) and \( \text{CO}_2 \)
(b) CFCs and \( \text{N}_2\text{O} \)
(c) \( \text{CH}_4 \) and \( \text{CO}_2 \)
(d) \( \text{CH}_4 \) and CFCs
Answer: (b) CFCs and \( \text{N}_2\text{O} \).
In simple words: Chlorofluorocarbons (CFCs) account for 14% of global warming, and Nitrous oxide (\( \text{N}_2\text{O} \)) accounts for 6%. These gases trap heat in the atmosphere, leading to a rise in global temperatures.

🎯 Exam Tip: Memorize the approximate contributions of major greenhouse gases to global warming, as this is a common factual question in environmental science.

 

Question 6. One of the chief reasons among the following for the depletion in the number of species making endangered is.
(a) over hunting and poaching
(b) green house effect
(c) competition and predation
(d) habitat destruction
Answer: (d) habitat destruction.
In simple words: The main reason many animal and plant species become endangered is because their natural homes, or habitats, are destroyed. Losing their habitat means they lose food, shelter, and places to reproduce, making it hard for them to survive.

🎯 Exam Tip: Habitat destruction is consistently identified as the leading cause of biodiversity loss. Focus on understanding the various ways habitats are destroyed and their implications.

 

Question 7. Deforestation means
(a) growing plants and trees in an area where there is no forest
(b) growing plants and trees in an area where the forest is removed
(c) growing plants and trees in a pond
(d) removal of plants and trees
Answer: (d) removal of plants and trees.
In simple words: Deforestation simply means cutting down and removing trees from a forest area. This action often changes the land permanently, preventing new trees from growing back naturally.

🎯 Exam Tip: Understand the direct definition of deforestation and distinguish it from afforestation (planting trees) or reforestation (replanting in previously forested areas).

 

Question 8. Deforestation does not lead to
(a) Quick nutrient cycling
(b) soil erosion
(c) alternation of local weather conditions
(d) Destruction of natural habitat weather conditions
Answer: (a) Quick nutrient cycling.
In simple words: Deforestation slows down how nutrients move through the soil and plants, it does not make it quicker. When trees are removed, the soil loses its protection, leading to more erosion, changes in local weather, and habitat destruction.

🎯 Exam Tip: When answering "does not lead to" questions, consider all effects of the process and identify the one that is contrary or unrelated to the common consequences.

 

Question 9. The unit for measuring ozone thickness
(a) Joule
(b) Kilos
(c) Dobson
(d) Watt
Answer: (c) Dobson
In simple words: The thickness of the ozone layer is measured using a unit called the Dobson Unit. This unit helps scientists track changes in the ozone layer's density.

🎯 Exam Tip: Familiarize yourself with standard scientific units, especially those related to environmental measurements like ozone thickness.

 

Question 10. People's movement for the protection of environment in sirsi of Karnataka is
(a) Chipko movement
(b) Amirtha Devi Bishwas movement
(c) Appiko movement
(d) None of the options
Answer: (c) Appiko movement.
In simple words: The Appiko movement was a famous environmental effort in Karnataka, where people hugged trees to prevent them from being cut down. It was inspired by the Chipko movement but took place in a different region.

🎯 Exam Tip: Distinguish between similar environmental movements, noting their specific regions and key leaders or actions. The Chipko movement was in the Himalayas, while Appiko was in Karnataka.

 

Question 11. The plants which are grown in silivpasture system are
(a) Sesbania and Acacia
(b) Solenum and Crotalaria
(c) Clitoria and Begonia
(d) Teak and sandal
Answer: (a) Sesbania and Acacia.
In simple words: In a silvopasture system, certain trees and shrubs are grown alongside pasture grasses for livestock. Sesbania and Acacia are good choices for this system because they provide fodder and improve soil quality.

🎯 Exam Tip: Understand the principles of agroforestry systems like silvopasture, including suitable plant species and their benefits to both livestock and the environment.

 

Question 12. What is the ozone hole?
Answer: The ozone hole is the term used when the ozone layer becomes thinner over a specific area, usually the polar regions. This thinning allows more harmful ultraviolet (UV) radiation from the sun to reach Earth's surface. This increased UV radiation can cause skin cancer and other health issues.
In simple words: The ozone hole means the ozone layer in the sky gets thinner in one spot. This lets more bad sun rays come down to Earth.

🎯 Exam Tip: Clarify that the "ozone hole" is not an actual hole, but rather a significant thinning of the ozone layer. Also, mention the primary cause (CFCs) and the major consequence (increased UV radiation).

 

Question 13. Give four examples of plants cultivated in commercial agroforestry.
Answer: In commercial agroforestry, various trees are grown along with crops or livestock to provide multiple benefits. Four examples of plants cultivated in this system are Casuarina, Eucalyptus, Malai vembu, Teak, and Kadambu trees. These trees can offer timber, fuel, fodder, and help improve soil health.
In simple words: Casuarina, Eucalyptus, Malai vembu, Teak, and Kadambu trees are often grown in planned forest farms. They give us wood, help the soil, and provide other useful things.

🎯 Exam Tip: When providing examples, choose distinct species that highlight the diversity and multiple uses of plants in agroforestry systems.

 

Question 14. Expand CCS.
Answer: CCS stands for Carbon Capture and Storage. This is a technology that captures carbon dioxide (\( \text{CO}_2 \)) emissions from industrial sources, like power plants, and then stores it deep underground instead of releasing it into the atmosphere. The goal of CCS is to reduce the amount of greenhouse gases that contribute to global warming. It is also known as Geological sequestration.
In simple words: CCS means Carbon Capture and Storage. It's a way to grab carbon dioxide from factories and bury it deep underground so it doesn't warm the Earth.

🎯 Exam Tip: When defining an acronym, always state the full form first, then provide a concise explanation of what the technology or concept involves and its main purpose.

 

Question 15. How do forests help in maintaining the climate?
Answer: Forests play a crucial role in maintaining the Earth's climate in several ways:

• They regulate carbon dioxide (\( \text{CO}_2 \)) levels in the atmosphere by absorbing it for photosynthesis.
• Larger forest areas mean more \( \text{CO}_2 \) is removed from the air, which helps reduce the effects of global climate change.
• Forests also regulate ecosystems, protect biodiversity, and are vital for the carbon cycle.
• In tropical regions, trees release water vapor into the air through transpiration, which increases cloud cover and helps cool temperatures.

In simple words: Forests keep the climate stable by breathing in carbon dioxide and keeping the air clean. They also help make clouds and keep places cool by releasing water.

🎯 Exam Tip: Focus on the two main mechanisms by which forests regulate climate: carbon sequestration (removing \( \text{CO}_2 \)) and influencing the water cycle (transpiration leading to cooling and cloud formation).

 

Question 16. How do sacred groves help in the conservation of biodiversity?
Answer: Sacred groves are small patches of forest or trees that are protected by local communities due to strong religious beliefs. These groves are often considered homes of deities, like village gods or goddesses. This cultural and religious significance means they are preserved, which helps conserve many plants and animals within them. In Tamil Nadu, for example, 448 such groves have been documented, providing important ecosystem services such as protecting water sources, supplying fodder, medicinal plants, and regulating local climate. This traditional approach ensures that rich biodiversity is maintained.
In simple words: Sacred groves are small forests kept safe by local people because of their religious beliefs. These protected areas help save many different types of plants and animals, and they also provide useful things like water and medicines.

🎯 Exam Tip: Highlight the dual aspect of sacred groves: cultural/religious protection and their tangible role in biodiversity conservation and ecosystem services. Mentioning specific examples, like those in Tamil Nadu, strengthens the answer.

 

Question 17. Which one gas is most abundant out of the four commonest greenhouse gases? Discuss the effect of this gas on the growth of plants?
Answer: Carbon dioxide (\( \text{CO}_2 \)) is the most abundant among the common greenhouse gases. While \( \text{CO}_2 \) is essential for plant photosynthesis, its excess in the atmosphere, due to global warming, has several negative effects on plant growth and overall ecosystems:

• It can lead to lower agricultural productivity in tropical areas.
• Increased temperatures cause more frequent heat waves, which can lead to more weeds, pests, and fungi, harming crops.
• It contributes to strong storms and severe flood damage, which can destroy crops and habitats.
• It also causes water shortages and reduced irrigation, impacting plant health.
• Changes in \( \text{CO}_2 \) levels can alter flowering seasons and affect pollinators, disrupting plant reproduction.
• It can change where different species of plants grow, pushing some out of their natural areas.

In simple words: Carbon dioxide is the biggest greenhouse gas. Too much \( \text{CO}_2 \) makes the Earth warmer, which can hurt plants by causing heat waves, floods, water shortages, and changing when they flower.

🎯 Exam Tip: Clearly state \( \text{CO}_2 \) as the most abundant gas. When discussing its effects on plants, differentiate between its role in photosynthesis (necessary) and the negative consequences of *excessive* levels due to global warming.

 

Question 18. Suggest a solution to water crisis and explain its advantages.
Answer: Rainwater harvesting (RWH) is an effective solution to the water crisis. It involves collecting and storing rainwater instead of letting it run off. Rainwater can be gathered from rooftops, rivers, or other surfaces and directed into a deep pit where it percolates into the ground, replenishing groundwater. RWH is a sustainable and cost-effective method used in both urban and agricultural areas.
The environmental benefits of Rainwater Harvesting include:

1. It improves the amount of underground water and helps conserve water.
2. It reduces the impact of droughts by providing an alternative water source.
3. It decreases soil erosion by reducing surface run-off.
4. It lessens the risk of floods.
5. It improves groundwater quality and raises the water table, which also helps decrease salinity.
6. No land is wasted for storage, and there is no need to move people.
7. Storing water underground is an environmentally friendly way to manage water, supporting local communities.

In simple words: Rainwater harvesting helps collect and save rain for later use. This fills up underground water, stops floods, and gives us more clean water to use, which is good for the environment and people.

🎯 Exam Tip: Define rainwater harvesting clearly, then list its advantages, ensuring you cover both environmental and practical benefits. Emphasize its sustainability and cost-effectiveness.

 

Question 19. Explain afforestation with case studies.
Answer: Afforestation is the process of planting trees in an area that has not been forested before, or where previous forest cover has been lost, to create new forests or restore vegetation. For example, trees are planted on dam slopes to reduce water run-off, erosion, and siltation. This also provides environmental benefits like carbon capture and water retention.
A notable case study is "The Forest Man of India," Jadav "Molai" Payeng, who was born in 1963. He single-handedly planted a vast forest on a barren wasteland. His efforts transformed Majuli, the world's largest river island on the Brahmaputra, into a dense forest that is now home to rhinos, deer, elephants, tigers, and various birds. By October 2013, he was recognized by former vice-chancellor Sudhir Kumar Sopory. In 2015, he received the Padma Shri, India's fourth-highest civilian award, and an honorary doctorate for his contributions.
Additionally, projects like the Tamil Nadu Afforestation Project (TAP) aim to restore degraded forests, improve the quality of life for villagers, enhance biodiversity, and promote water conservation through reforestation and community involvement.
In simple words: Afforestation means planting new trees where there were none, or where they were lost. Jadav Payeng, called the "Forest Man of India," grew a huge forest all by himself. Projects like the Tamil Nadu Afforestation Project also help plant trees to make the environment better and help local people.

🎯 Exam Tip: Define afforestation clearly, then provide one or two compelling case studies (like Jadav Payeng's work or a specific project) to illustrate its practical application and impact. Include key details to make the case study convincing.

 

Question 20. What are the effects of deforestation and benefits of agroforestry?
Answer:Effects of deforestation:

• Burning forest wood releases stored carbon, which negatively impacts the atmosphere, unlike carbon sequestration.
• Trees and plants hold soil particles together; removing forest cover increases soil erosion and reduces soil fertility, leading to desertification in dry regions.
• Increased water run-off due to deforestation boosts soil erosion and causes flash flooding, which also reduces moisture and humidity.
• Changes in local rainfall patterns can cause droughts, leading to bad weather conditions and disrupting the water cycle.
• Deforestation significantly reduces biodiversity by destroying habitats.
• It causes loss of livelihood for forest dwellers and rural populations who depend on forests.
• It increases global warming, accounting for about one-third of total \( \text{CO}_2 \) emissions.
• It leads to a loss of essential resources like fuel, medicinal herbs, and wild edible fruits.

Benefits of agroforestry:

• Agroforestry helps conserve soil and water, stabilizes soil (reducing salinity and improving water tables), and prevents landslides and water run-off.
• It improves nutrient cycling between different plant species and helps maintain organic matter in the soil.
• Trees in agroforestry create a microclimate for crops, maintaining \( \text{CO}_2 \) balance, atmospheric temperature, and relative humidity.
• It is suitable for dry lands with low rainfall, providing a good alternative land use pattern.
• Multipurpose tree species like Acacia are used for various industries, providing wood pulp, tanning materials, paper, and firewood.
• Agroforestry is recommended for various purposes, including farm forestry to expand forests, mixed forestry, and creating shelterbelts and linear strip plantations.

In simple words: Cutting down forests causes soil to wash away, changes weather, harms animals, and makes the Earth warmer. But growing trees with crops (agroforestry) helps protect the soil, saves water, improves the air, and gives us many useful things.

🎯 Exam Tip: Clearly separate the effects of deforestation from the benefits of agroforestry. For each section, provide specific, distinct points to demonstrate a comprehensive understanding of both concepts.

12th Bio Botany Guide Environmental Issues Additional Important Questions And Answers

I. Match

 

Question 1. Match the column I with column II and select correct option

(a) A - 4,B - 3, C - 1, D - 2
(b) A - 3, B - 2, C - 1, D - 4.
(c) A - 2, В - 1, C - 3, D - 4.
(d) A - 1, B - 3, C - 2, D - 4.
Answer: (a) A - 4,B - 3, C - 1, D - 2
In simple words: This matching correctly pairs methane with its high global warming potential, UV radiation with skin cancer, 0.3cm/300DU with ozone layer thickness, and nitrogenous fertilizers with global warming contribution. Each match links a cause or characteristic to its effect or measure.

🎯 Exam Tip: For matching questions, systematically go through each item in Column I and find its most appropriate match in Column II. This helps ensure accuracy, especially when options are similar.

 

Question 2. Match the column I with column II and select correct option

(a) A - 1,B - 2, C - 3, D - 4
(b) A - 2, B - 1, C - 4, D - 3.
(c) А - 2, В - 3, C - 4, D - 1
(d) A - 3, B - 2, C - 1, D - 2.
Answer: (b) A - 2, B - 1, C - 4, D - 3
In simple words: This matching correctly links ozone depletion to chlorofluorocarbons, World Ozone Day to September 16, the Kyoto Protocol to 2007, and the Montreal Protocol to 1987. These pairs connect environmental issues, awareness days, and important international agreements.

🎯 Exam Tip: Knowing key dates and the primary causes or objectives of environmental issues and protocols is vital for these types of questions. The Montreal Protocol aimed to protect the ozone layer, while the Kyoto Protocol focused on greenhouse gas emissions.

 

Question 3. Match the column I with column II and select correct option

(a) A - 3, B - 1, C - 4, D - 2
(b) A - 2, B - 3, C - 4, D - 1.
(c) А - 1, В - 2, C - 3, D - 4.
(d) A - 3, B - 2, C - 1, D - 4.
Answer: (a) A - 3, B - 1, C - 4, D - 2
In simple words: This matching shows that Pinus trees are affected by sulfur dioxide pollution, Petunias indicate nitrate pollution, Gladiolus flowers show fluoride pollution, and Black locust trees are indicators of heavy metal contamination. Different plants react differently to various pollutants, making them useful as bioindicators.

🎯 Exam Tip: Learn specific plant species that serve as bioindicators for different types of pollution. This knowledge helps understand the environmental health of an area.

 

Question 1. Choose the correct statement from the following.
(a) Agricultural drones are animals used to do heavy agricultural works.
(b) CARTOSAT-2 is used to watch border surveillance.
(c) The production of flowering plants combined with pasture is reffered to silvopasture system.
(d) GTS is a satellite navigation system used to determine the ground position of an object
Answer: (b) CARTOSAT-2 is used to watch border surveillance.
(d) GTS is a satellite navigation system used to determine the ground position of an object
In simple words: CARTOSAT-2 is a satellite that helps monitor borders from space, which is a true statement. Also, the GTS (Global Positioning System) is a satellite system that finds the exact spot of things on Earth, which is also correct. Agricultural drones are machines, not animals, and silvopasture involves trees and pasture, not just flowering plants.

🎯 Exam Tip: Carefully read each statement and identify specific facts about technologies and systems. Pay attention to definitions and applications to differentiate correct from incorrect statements.

III. Choose The Incorrect Statement

 

Question 1. Choose the incorrect statement related to effects of ozone depletion.
(a) Juvenile mortality of animal, Increased incidence of mutations.
(b) Increases the incidence of cataract, throat and lung irritation, emphysema, skin cancer.
(c) Flood/ drought, sea water rise, Imbalance in ecosystem affecting flora and fauna.
(d) Diminishing the functioning of immune system is not related to ozone depletion.
Answer: (d) Diminishing the functioning of immune system is not related to ozone depletion.
In simple words: All the other options describe real problems caused by ozone depletion, but a weakening immune system is also a known effect. So, stating it is "not related" makes this the incorrect statement.

🎯 Exam Tip: When identifying incorrect statements, carefully evaluate each option for factual accuracy. Sometimes, an option is incorrect because it falsely denies a known effect.

 

Question 2. Choose the incorrect statement related to forestry.
(a) The tank foreshore plantations have been a major source of firewood in Tamilnadu.
(b) The production of woody plants combined with pasture is referred to silvopasture system.
(c) Trees provide micro climate for crops and maintain \( \text{O}_2 - \text{CO}_2 \) balance.
(d) Agro-forestry is an integration of trees, animals, water bodies and humans.
Answer: (d) Agro-forestry is an integration of trees, animals, water bodies and humans.
In simple words: Agroforestry focuses on growing trees with crops or livestock, usually on the same land, to improve both farming and the environment. It does not typically include water bodies or humans as integral parts of its definition.

🎯 Exam Tip: Remember the core components of different forestry systems. Agroforestry is primarily about trees, crops, and livestock working together on land, not integrating water bodies or humans as elements of the system itself.

IV. Choose The Correct Statement

 

Question 1. Choose the correct statement from the following.
(a) Agricultural drones are animals used to do heavy agricultural works.
(b) CARTOSAT-2 is used to watch border surveillance.
(c) The production of flowering plants combined with pasture is referred to silvopasture system.
(d) GTS is a satellite navigation system used to determine the ground position of an object.
Answer: (b) CARTOSAT-2 is used to watch border surveillance. And (d) GTS is a satellite navigation system used to determine the ground position of an object.
In simple words: Agricultural drones are machines, not animals. Silvopasture involves woody plants and pasture, not specifically flowering plants. However, CARTOSAT-2 is indeed used for border surveillance, and GTS is correctly described as a satellite navigation system for location.

🎯 Exam Tip: For questions with multiple correct options, identify each accurate statement. Always be cautious of misleading definitions for technical terms.

V. Pick Out The Odd One Out And Give Reason

 

Question 1. In-situ, Ex-situ, National parks, Biosphere Reserves, Remote seming.
(a) Remote seming, while other are related to biodiversity conservation.
(b) National parks, while others are man made project.
(c) Biosphere reserves, detecting and monitoring the physical characteristic of an area.
(d) None of the options
Answer: (a) Remote seming, while other are related to biodiversity conservation.
In simple words: In-situ conservation, ex-situ conservation, national parks, and biosphere reserves are all ways to protect living things and their habitats. "Remote sensing" is a method of gathering information from a distance, like using satellites, and it's not a conservation method itself, making it the odd one out.

🎯 Exam Tip: Understand the definitions of conservation methods (in-situ, ex-situ) and tools (remote sensing). This helps in categorizing and identifying outliers.

 

Question 2. Reduces flood hazards, decreases salinity Reduces soil erosion, carbon sink.
(a) Reduces soil erosion while others are related to Rainwater harvesting system.
(b) Carbon sink, while others are related to benefits of Rain water harvesting.
(c) Decreases salinity, while others are related to rain water harvesting.
(d) Reduces soil erosion, while others are eco friendly method.
Answer: (b) Carbon sink, while others are related to benefits of Rain water harvesting.
In simple words: Reducing flood hazards, decreasing salinity, and reducing soil erosion are all good outcomes or benefits of rainwater harvesting. A "carbon sink" is about absorbing carbon dioxide, which is a different environmental concept, making it the odd one out among the benefits listed for rainwater harvesting.

🎯 Exam Tip: Focus on the common theme of the given list. If most items relate to a specific practice (like rainwater harvesting), the item that doesn't fit that theme is usually the odd one out.

 

Question 3. Lichens, Ficus, Pinus, Rose, Gladiolus.
(a) Lichens, while others are \( \text{SO}_2 \) pollution.
(b) Gladiolus is the heavy metal indicator, while others are related to \( \text{SO}_2 \) pollution.
(c) Gladiolus. while others are indicator for \( \text{SO}_2 \) pollution.
(d) Pinus is the nitrate indicator, while others are \( \text{SO}_2 \) pollution.
Answer: (c) Gladiolus. while others are indicator for \( \text{SO}_2 \) pollution.
In simple words: Lichens, Ficus, Pinus, and Rose are all types of plants or organisms that can indicate \( \text{SO}_2 \) pollution. However, Gladiolus is known as an indicator for heavy metal pollution, not \( \text{SO}_2 \) pollution. This makes the statement about Gladiolus being an \( \text{SO}_2 \) indicator incorrect compared to the others.

🎯 Exam Tip: Know specific bioindicators for different types of pollution. Misidentifying an indicator species for a pollutant is a common trick in these types of questions.

VI. Pictorial Questions

 

Question 1. Relative contribution of green house gas are shown below. Which one of the given option is correct?
(a) A – others, B – \( \text{CH}_4 \), C – CFC, D – \( \text{O}_2 \)
(b) A – \( \text{CH}_4 \), B – \( \text{CO}_2 \), C – \( \text{O}_2 \),D – CFC
(c) А – \( \text{СО}_2 \), В – \( \text{CH}_4 \), C – CFC, D – \( \text{O}_2 \)
(d) A – others, B – \( \text{CH}_4 \), C – CFC, D – \( \text{CO}_2 \)
Answer: (d) A – others, B – \( \text{CH}_4 \), C – CFC, D – \( \text{CO}_2 \)
In simple words: The diagram shows different greenhouse gases and their contribution. Option (d) correctly matches the parts of the diagram to 'others', methane (\( \text{CH}_4 \)), chlorofluorocarbons (CFC), and carbon dioxide (\( \text{CO}_2 \)).

🎯 Exam Tip: Familiarize yourself with the relative contributions of major greenhouse gases to global warming; \( \text{CO}_2 \) is the largest, followed by \( \text{CH}_4 \), CFCs, and \( \text{N}_2\text{O} \).

 

Question 2. Examine the diagram Which is showing the percentage. Find out the Green house gas related to its percentage.
Answer: Carbon dioxide (\( \text{CO}_2 \)) is 60%, Methane (\( \text{CH}_4 \)) is 20%, Chlorofluorocarbons (CFC) is 14%, and Nitrous oxide (\( \text{N}_2\text{O} \)) is 6%. These are the four main greenhouse gases and their approximate contributions to global warming.
In simple words: The chart breaks down how much different greenhouse gases add to global warming. Carbon dioxide adds the most, then methane, then CFCs, and then nitrous oxide.

🎯 Exam Tip: It is crucial to remember the approximate percentages of major greenhouse gases that contribute to global warming as they are standard figures in environmental science.

VII. Assertion And Reason

 

Question 1. Assertion: Sacred groves and sacred lakes are community protected Bio-diversity conservation.
Reason: Which are based on strong religious belief system,
(a) A is correct R is wrong.
(b) A is correct but R does not explains A.
(c) A is correct and R is the correct explanation for A
(d) A and R are wrong.
Answer: (c) A is correct and R is the correct explanation for A
In simple words: Both the assertion (that sacred groves and lakes protect biodiversity) and the reason (that this protection comes from strong religious beliefs) are true. The religious beliefs are the core reason why these natural areas are protected by local communities.

🎯 Exam Tip: In Assertion-Reason questions, first check if both statements are individually true. Then, determine if the Reason directly explains the Assertion.

 

Question 2. Assertion : Appiko movement started in Gubbi Gadde village sirsi in karnataka by panduranga Hegde.
Reason: It is started to protest against felling of trees, monoculture, forest policy and deforestation
(a) Both are wrong.
(b) A and R is correct
(c) A is correct R- does not explains A.
(d) A is wrong R is correct.
Answer: (b) A and R is correct
In simple words: The Appiko movement was indeed started by Panduranga Hegde in Gubbi Gadde, Karnataka. The main goal of this movement was to stop trees from being cut down, to fight against planting only one type of tree, and to protest bad forest policies. Both statements are correct and the reason explains the assertion.

🎯 Exam Tip: When evaluating historical movements, verify the key figures, locations, and primary objectives. This helps in confirming the accuracy of both assertion and reason.

VIII. Spot The Error

 

Question 1. Correct the following statement: Biosphere Reserves, National parks and wildlife sanctuaries are community protected Bio-diversity conservation.
Answer: Biosphere Reserves, National parks and wildlife sanctuaries are Government protected Bio-diversity conservation.
In simple words: The mistake in the original statement is saying these areas are "community protected." They are actually protected by the "Government" to save different kinds of plants and animals.

🎯 Exam Tip: Differentiate between community-managed and government-managed conservation areas; national parks and biosphere reserves fall under government protection.

IX. Choose The Incorrect Pair

 

Question 1. Choose the incorrect pair.
(a) Protein Bank-Fodder production.
(b) Livefence, foddertree – Erythrina spp.
(c) Agro forestry – Extension of forest, mixed forestry.
(d) Social forestry-Jadav,Molaipayeng.
Answer: (d) Social forestry-Jadav,Molaipayeng.
In simple words: Jadav "Molai" Payeng is famous for single-handedly planting a large forest, earning him the title "Forest Man of India," but he is not primarily associated with the social forestry movement. Social forestry usually involves local communities managing forest resources.

🎯 Exam Tip: Accurately associate key individuals with their specific environmental movements or contributions to avoid confusion.

X. Read The Following Statement With Two Blanks A And B Select The Correct Option For Blank A And B.

 

Question 1. Eichhornia crassipes is an invasive weed native to south America. It affects the growth of A and finally leads to B.
(a) Phytoplankton, eutrophication
(b) Prosopis, oxygen content
(c) Topography, geology
(d) Plants, environmental issues
Answer: (a) Phytoplankton, eutrophication
In simple words: Eichhornia crassipes, also known as water hyacinth, grows very fast in water. It covers the water surface, blocking sunlight and affecting small water plants called phytoplankton. This overgrowth uses up oxygen in the water, which can lead to eutrophication, harming other aquatic life.

🎯 Exam Tip: Understand the ecological impacts of invasive species like water hyacinth, particularly its role in nutrient cycling and oxygen depletion in aquatic ecosystems.

XI. Fill In The Blanks Answers

 

Question 1. Biochar is another long term method to store carbon.
Answer: Biochar
In simple words: Biochar is a special kind of charcoal made from plants. When you put it in the soil, it helps to keep carbon locked away for a long time, which is good for the environment.

🎯 Exam Tip: Remember biochar as a key method for carbon sequestration, which involves capturing and storing atmospheric carbon dioxide.

 

Question 2. Carbon foot print is the total amount of green house gases produced by human activated.
Answer: Carbon foot print
In simple words: Your carbon footprint is a measure of all the greenhouse gases you release into the air through your daily activities, like driving a car or using electricity.

🎯 Exam Tip: Define carbon footprint clearly as the total greenhouse gas emissions caused by an individual, event, organization, or product.

 

Question 3. Eating indigenous fruits and products are reduce Carbon foot print.
Answer: Carbon foot print
In simple words: When you eat fruits and products from your local area, it means less fuel is used to transport them, which helps to lower the total amount of greenhouse gases released.

🎯 Exam Tip: Explain the connection between local consumption and reduced carbon footprint, emphasizing transportation and production emissions.

 

Question 4. The forest, soil, ocean are Natural and landfills are artificial sinks.
Answer: Natural, artificial
In simple words: Forests, soil, and oceans naturally take in carbon, acting as "sinks." Landfills are man-made places that can also trap carbon, making them "artificial" sinks.

🎯 Exam Tip: Distinguish between natural carbon sinks (like forests and oceans) and artificial carbon sinks (like landfills or engineered storage solutions).

 

Question 5. The thickness of the ozone column of air is measured in terms of Dobson unit.
Answer: Dobson unit
In simple words: We measure how much ozone is in the air using a special unit called the Dobson Unit. It helps us know if the ozone layer is getting thinner.

🎯 Exam Tip: Clearly state "Dobson Unit" as the standard unit for measuring the total column ozone in the atmosphere.

 

Question 6. Carbon dioxide is the anthropogenic greenhouse gas.
Answer: Carbon dioxide
In simple words: Carbon dioxide is the main greenhouse gas that humans release into the air, mostly from burning fossil fuels like coal and gas. This extra gas causes the Earth to get warmer.

🎯 Exam Tip: Identify \( \text{CO}_2 \) as the primary anthropogenic greenhouse gas due to its high volume of emissions from human activities.

 

Question 7. Tank foreshore plantations have been a major source of fire wood in Tamilnadu.
Answer: Tank foreshore
In simple words: In Tamilnadu, the plantations grown along the edges of tanks (water reservoirs) have historically been an important source of wood for fuel.

🎯 Exam Tip: Recognize specific regional examples of resource management, such as the significance of tank foreshore plantations in Tamilnadu.

 

Question 8. World ozone Day is celebrated on September 16.
Answer: September 16
In simple words: Every year on September 16th, people around the world celebrate World Ozone Day. This day reminds us about the importance of protecting the Earth's ozone layer.

🎯 Exam Tip: Remember important environmental dates like World Ozone Day (September 16) as they often appear in general knowledge and environmental awareness questions.

XII. Choose The Correct Option

 

Question 1. Which creates a breeding habitat for disease causing mosquito Anopheles?
(a) Eichhornia crassipes
(b) Lantana camara
(c) Prosopis juliflora
(d) Parthenium hysterophorus
Answer: (a) Eichhornia crassipes
In simple words: Eichhornia crassipes, also known as water hyacinth, forms dense mats on water surfaces. These mats provide a perfect place for mosquitoes like Anopheles (which spread malaria) to breed and hide, helping diseases spread.

🎯 Exam Tip: Link invasive aquatic plants, like water hyacinth, to their ecological impacts, specifically creating breeding grounds for disease vectors.

 

Question 2. Which one the activities is replacement of conventional electrification project solar panels or other energy efficient boilers?
(a) Clean Development Mechanism (CDM)
(b) Chloro Fluoro Carbon (CFC)
(c) Certified Emission Reduction (CER)
(d) TamilNadu Afforestation Project (TAP)
Answer: (a) Clean Development Mechanism (CDM)
In simple words: The Clean Development Mechanism (CDM) is a program that lets developed countries invest in projects in developing countries that reduce greenhouse gas emissions, like switching to solar power, to earn credits. This helps both sides fight climate change.

🎯 Exam Tip: Understand that CDM is a flexible mechanism under the Kyoto Protocol designed to promote sustainable development and emissions reductions in developing countries.

 

Question 3. Some of the major species cultivated in Agroforestry for commercial use:
(a) Erythrina, Albizzia
(b) Malaivembu, Kadambu
(c) Acacia, Azadirachta Indica
(d) Sesbania, Acacia
Answer: (b) Malaivembu, Kadambu
In simple words: Malaivembu and Kadambu trees are often grown together with crops or livestock in agroforestry systems because they grow quickly and can be used for wood or other products, bringing money to farmers.

🎯 Exam Tip: When listing commercial agroforestry species, consider those known for rapid growth and multiple uses, which enhance farm income.

 

Question 4. Which one of the following is not a carbon sequestration method?
(a) Forest conservation and soil conservation
(b) Carbon foot print
(c) Biochar
(d) Increasing the number of animals.
Answer: (d) Increasing the number of animals.
In simple words: Carbon sequestration means taking carbon dioxide out of the air and storing it. Forest and soil conservation, as well as using biochar, help store carbon. But increasing the number of animals, especially livestock, often leads to *more* greenhouse gas emissions like methane, not less.

🎯 Exam Tip: Understand that carbon sequestration methods aim to *reduce* atmospheric carbon. Activities that increase greenhouse gas emissions, such as some types of animal farming, are not sequestration methods.

 

Question 5. Chlorella, sceuedesmus, chroococcus and chlamydomonas are used globally for
(a) conservation movement
(b) micro climate.
(c) carbon sequestration
(d) Biochar preparation.
Answer: (c) Carbon sequestration
In simple words: These are all types of microalgae (tiny plants). They are used to capture carbon dioxide from the air, turning it into their own biomass, which is a way of storing carbon and reducing greenhouse gases.

🎯 Exam Tip: Microalgae are efficient biological agents for carbon sequestration due to their rapid growth and high photosynthetic rates.

 

Question 6. Botanical garden, zoological park, in-vitro conservation, cryo preservation, seedling, tissue culture and DNA banks are Ex-situ conservation.
(a) Sacred groves
(b) In-situ conservation.
(c) Ex-situ conservation
(d) Appiko movement
Answer: (c) Ex-situ conservation
In simple words: Ex-situ conservation means protecting plants and animals *outside* their natural homes, like in zoos, botanical gardens, or seed banks. All the examples listed are ways of doing this.

🎯 Exam Tip: Clearly distinguish between in-situ (on-site) and ex-situ (off-site) conservation methods, remembering specific examples for each category.

 

Question 7. 448 grooves were documented through out Tamil Nadu
(a) 446
(b) 447
(c) 448
(d) 449
Answer: (c) 448
In simple words: In Tamil Nadu, there were 448 sacred groves (small forest patches with religious importance) officially recorded and studied for their biodiversity.

🎯 Exam Tip: Specific numbers related to environmental surveys or biodiversity documentation often appear in exams; try to recall them accurately.

 

Question 8. Species which is present in some part of continent or present in single island is.
(a) Endemic
(b) Epidemic
(c) Pandamic
(d) Sporadic
Answer: (a) Endemic
In simple words: An "endemic" species is a type of plant or animal that is found only in a specific small area, like a particular island or a small part of a country, and nowhere else in the world.

🎯 Exam Tip: Understand the term "endemic" as describing species native and restricted to a specific geographic region, making them particularly vulnerable to habitat loss.

 

Question 9. Approximately one third of India flora have been identified in Indian Himalayas, Peniris India, and Andaman nicobar island it is endemic species.
(a) pandamic
(b) epidemic
(c) endemic
(d) sporadic
Answer: (c) endemic.
In simple words: A large portion of India's plant life, especially in places like the Himalayas and the Andaman-Nicobar Islands, is unique to those areas and not found anywhere else. These species are called endemic.

🎯 Exam Tip: The term "endemic" is crucial for understanding biodiversity hotspots and the unique species found in them.

 

Question 10. Bentinckia condappana tree, which is endemic to Western ghats of Tamil Nadu and kerala
(a) Western ghats
(b) Peninsular
(c) Coastal
(d) Slope
Answer: (a) Western ghats.
In simple words: The Bentinckia condappana tree is a special kind of tree that grows naturally only in the Western Ghats region, which spans parts of Tamil Nadu and Kerala. It cannot be found anywhere else.

🎯 Exam Tip: Specific examples of endemic species and their native regions are important for questions on biodiversity and ecological geography.

 

Question 11. Lianas, Nepenthes khasiyana is endemic to Khasi hills of meghalaya
(a) Western ghat
(b) Peninsular
(c) Meghalaya
(d) Khasi hills
Answer: (d) Khasi hills
In simple words: The plant Nepenthes khasiyana, a type of pitcher plant, is found only in the Khasi hills, which are located in Meghalaya. It is unique to this specific region.

🎯 Exam Tip: Be precise about geographic locations; "Khasi hills" is a more specific area within "Meghalaya," which is relevant for endemic species.

 

Question 12. Macroalgae and Marine grasses and Mangroves have ability to mitigate \( \text{CO}_2 \).
(a) \( \text{N}_2\text{O} \)
(b) CFC
(c) \( \text{CO}_2 \)
(d) \( \text{CH}_4 \)
Answer: (c) \( \text{CO}_2 \)
In simple words: Large seaweeds (macroalgae), marine grasses, and mangrove trees can all help reduce global warming. They do this by taking in carbon dioxide (\( \text{CO}_2 \)) from the atmosphere or water and storing it in their bodies, a process called carbon sequestration.

🎯 Exam Tip: Recognize marine ecosystems (like mangroves and seagrass beds) as important "blue carbon" sinks that absorb large amounts of atmospheric carbon dioxide.

 

Question 13. Trees like Eugenia Caryo phyllata, Tecomastans cinnamomum verum have high capacity to sequester Carbon.
(a) \( \text{N}_2\text{O} \)
(b) Carbon
(c) Methane
(d) CFC
Answer: (b) Carbon
In simple words: These types of trees are very good at taking carbon out of the air and storing it within their wood and leaves. This process helps to reduce the amount of carbon dioxide in the atmosphere, which is good for the environment.

🎯 Exam Tip: The term "sequester" specifically refers to the capture and long-term storage of carbon, primarily by plants and soil.

 

Question 14. Which one of the following is an alien invasive species?
(a) Mangifera indica
(b) Eichhornia crassipes
(c) Solanum nigrum
(d) Zizipus jujupa
Answer: (b) Eichhornia crassipes
In simple words: An alien invasive species is a plant or animal that is brought to a new place and then grows so much that it harms the local environment. Eichhornia crassipes, or water hyacinth, is a well-known example that has spread widely and caused problems.

🎯 Exam Tip: Be able to identify common examples of alien invasive species and understand their negative impacts on native ecosystems.

 

Question 15. Environmental management tool is an Environmental Impact assessment.
(a) Biodiversity Impact assessment
(b) Environmental Impact assessment
(c) Bio monitoring
(d) GIS
Answer: (b) Environmental Impact assessment
In simple words: An Environmental Impact Assessment (EIA) is a tool used to study what big projects, like building a new factory, might do to the environment before they start. It helps in making decisions that cause less harm to nature.

🎯 Exam Tip: Define Environmental Impact Assessment (EIA) as a crucial planning tool to predict and mitigate environmental consequences of proposed projects.

 

Question 16. GPS system is used in mining, Aviation, surveying agricultural and marine ecosystem.
(a) GIS
(b) GPS
(c) BIA
(d) EIA
Answer: (b) GPS
In simple words: The Global Positioning System (GPS) uses satellites to pinpoint exact locations on Earth. This is very useful in many fields like mining, flying, mapping land, farming, and studying the ocean, because precise location information is needed.

🎯 Exam Tip: Focus on GPS as a location-determining technology, indispensable for various applications requiring precise geographic coordinates.

 

Question 17. InSAT3DR Satellites used in Disaster management.
(a) Earth observation
(b) Communication
(c) Disaster management
(d) Weather forecasting
Answer: (c) Disaster management
In simple words: INSAT-3DR is a type of satellite mainly used to help manage disasters. It provides important information that helps people prepare for, respond to, and recover from natural calamities like floods or cyclones.

🎯 Exam Tip: Recognize that specific satellite missions are designed for particular applications, with INSAT-3DR having a significant role in disaster management due to its weather and imagery capabilities.

 

Question 18. Now a days, scientists suggest carbon sequestration is a solution for global warming. The reason is
(a) The balance between photosynthesis and respiration is disturbed
(b) The absorption process of plants from the soil is disturbed
(c) Due to high intensity of light respiration process is disturbed
(d) Carbon sequestration is not the solution for global warming.
Answer: (d) Carbon sequestration is not the solution for global warming.
In simple words: While carbon sequestration helps reduce carbon in the air, it's not a complete solution on its own. It's one part of a bigger plan needed to fully stop global warming, which also requires cutting down on how much carbon we release in the first place.

🎯 Exam Tip: Understand that carbon sequestration is a valuable mitigation strategy but not a standalone solution, as it needs to be combined with significant emission reductions.

 

Question 19. Reforestation refers to
(a) Chipko movement
(b) Development of forest in an area which was already subjects to deforestation
(c) Development of forest through cultivabel land
(d) None of the options
Answer: (b) Development of forest in an area which was already subjects to deforestation.
In simple words: Reforestation means planting new trees in an area where trees were cut down or destroyed in the past. The goal is to bring the forest back to how it was before.

🎯 Exam Tip: Differentiate reforestation (replanting in previously forested areas) from afforestation (planting trees in areas that were never forests).

 

Question 20. World's most problematic aquatic weed is
(a) Clitoria
(b) Parthenium
(c) Eichhornia crassipes
(d) sesbania
Answer: (c) Eichhornia crassipes.
In simple words: Eichhornia crassipes, also known as water hyacinth, grows very fast and covers large areas of water. It causes many problems like blocking waterways, killing fish, and creating breeding grounds for mosquitoes, making it the most troublesome aquatic weed worldwide.

🎯 Exam Tip: Recognize Eichhornia crassipes (water hyacinth) as a globally significant invasive aquatic weed due to its rapid proliferation and severe ecological impacts.

 

Question 21. Which of the following gas related to release cars with catalytic converter and buring of organic matter.
(a) CO2
(b) Methane
(c) N2O
(d) CFC
Answer: (c) N2O
In simple words: Nitrous oxide (N2O) is a gas that comes from car exhausts with catalytic converters and from burning organic materials. It is a greenhouse gas, trapping heat in the atmosphere.

🎯 Exam Tip: Remember to link specific greenhouse gases to their main sources, like N2O from vehicle emissions and organic matter burning.

 

Question 22. The Ozone layer of troposphere is called
(a) Middle Ozone
(b) Ozone Shield
(c) Bad Ozone
(d) Good Ozone
Answer: (c) Bad Ozone
In simple words: The ozone that is found in the troposphere (the lowest part of Earth's atmosphere) is considered "bad" because it is a pollutant harmful to living things. It is different from the "good" ozone in the stratosphere that protects us from UV rays.

🎯 Exam Tip: Differentiate between tropospheric ozone (bad, pollutant) and stratospheric ozone (good, UV shield) for full understanding.

 

Question 23. Which one of the following is a livefence of fodder?
(a) Gliricidia sepium
(b) Nerium
(c) Aloevera
(d) Chrysanthemum
Answer: (a) Gliricidia sepium
In simple words: Gliricidia sepium is a plant used as a living fence that also provides food for animals. This helps farmers get more from their land by combining a boundary with a food source.

🎯 Exam Tip: Know common examples of plants used in agroforestry practices, especially those serving multiple purposes like live fences and fodder.

 

Question 24. Coral bleeching observed in Gulf of mannar, Tamil Nadu due to ............
(a) Decreases of fresh water
(b) Low rainfall
(c) Green house
(d) Dust particles
Answer: (c) green house
In simple words: Coral bleaching, like that seen in the Gulf of Mannar, happens because of the greenhouse effect. This makes ocean water warmer, causing corals to turn white and often die.

🎯 Exam Tip: Connect environmental issues like coral bleaching to their root causes, such as increased ocean temperatures from the greenhouse effect.

 

Question 25. Read the following statement and fill it with correct answer in the blank A and B the ozone layer of the troposphere is called A and the ozone layer of startosphere is known as B ............
(a) important, useful
(b) bad and lower
(c) bad zone, good zone
(d) good zone,bad zone
Answer: (c) bad zone, good zone
In simple words: The ozone layer in the lower atmosphere (troposphere) is harmful and called "bad ozone," while the ozone layer in the upper atmosphere (stratosphere) is helpful and called "good ozone" because it protects us from the sun.

🎯 Exam Tip: Clearly distinguish between the two types of ozone based on their atmospheric location and impact: tropospheric (bad) and stratospheric (good).

 

Question 26. The purple and blue colours of ozone picture indicate ............ ozone.
(a) Least
(b) High
(c) Medium
(d) Large
Answer: (a) Least
In simple words: When you see pictures of the ozone layer, purple and blue colors show where there is the smallest amount of ozone. These colors help us see where the ozone layer is thin.

🎯 Exam Tip: Remember the color coding for ozone maps: blue/purple indicates lower ozone concentration, while red/yellow indicates higher concentration.

 

Question 27. The yellow and red colours of ozone picture indicate ............ ozone.
(a) more
(b) medium
(c) low
(d) least
Answer: (a) more
In simple words: In ozone maps, yellow and red colors show areas with more ozone. These colors help scientists and others understand where the ozone layer is denser.

🎯 Exam Tip: Visual representations like color-coded maps are crucial for understanding environmental data, such as ozone density.

 

Question 28. The objective of clean development mechanism are/is
(a) Prevention of dangerous climate change
(b) Reduction of emission of green house gases
(c) Both (a) and (b)
(d) Reduction of electricity generation and its need.
Answer: (c) Both (a) and (b)
In simple words: The Clean Development Mechanism (CDM) works to stop harmful climate change and cut down on greenhouse gas emissions. It helps countries work together on projects to achieve these goals.

🎯 Exam Tip: Understand that mechanisms like CDM have dual objectives: mitigating climate change and reducing emissions, often through project-based approaches.

 

Question 29. Remote sensing is .
(a) Mapping ocean bottom and its resources
(b) Mapping forest fire
(c) Mapping species distribution
(d) all the above
Answer: (d) all the above
In simple words: Remote sensing uses technology to collect information about the Earth from a distance. It can be used for many things, like mapping the ocean floor, tracking forest fires, and seeing where different animals and plants live.

🎯 Exam Tip: Remote sensing is a versatile tool with broad applications in environmental monitoring, covering aspects from land to oceans and biodiversity.

 

Question 30. Bentinckia and Baccaurea are ............ plants.
(a) Invasive species
(b) Endemic
(c) Silvopasture
(d) None of these
Answer: (b) Endemic
In simple words: Bentinckia and Baccaurea are types of plants that are endemic. This means they are only found in certain specific places and nowhere else in the world.

🎯 Exam Tip: The term "endemic" refers to species found exclusively in a particular geographical area, making their conservation especially important.

 

Question 31. Eichornia. prosopis are plants ............
(a) endemic
(b) Invasive
(c) Silvopasture
(d) None of these
Answer: (b) Invasive
In simple words: Eichhornia (water hyacinth) and Prosopis (mesquite) are considered invasive plants. This means they are not native to an area and can spread quickly, harming the local plants and ecosystem.

🎯 Exam Tip: Understand the impact of invasive species, which can outcompete native plants and disrupt ecological balance.

 

Question 32. The management of forest and afforestation on barren lands is ............
(a) agroforestry
(b) Silvopasture
(c) Social forestry
(d) Afforestation
Answer: (c) Social forestry
In simple words: When forests are managed and trees are planted on empty, unused land, it is often called social forestry. This aims to benefit local communities and the environment.

🎯 Exam Tip: Social forestry emphasizes community involvement in forest management and tree planting, often on degraded or unused land for various benefits.

 

Question 33. Which is fast growing and more adopted species?
(a) Invasive species
(b) epidemic species
(c) Pandamic species
(d) Wild species
Answer: (a) Invasive species
In simple words: Invasive species are often fast-growing and adapt very well to new places, which is why they can quickly take over and cause problems for native plants and animals. They spread easily and thrive in many different environments.

🎯 Exam Tip: Recognize that the aggressive growth and adaptability of invasive species are key characteristics that make them problematic for native ecosystems.

 

Question 34. The plant species (or) community acts as a measure of enviornmental conditions is referred as ............
(a) Both b and d
(b) Plant indicators
(c) Protocol
(d) Biological indicators
Answer: (b) Plant indicators
In simple words: Some plants or groups of plants can show us what the environment is like, almost like a natural gauge. They are called plant indicators because their presence or health tells us about things like pollution or soil type.

🎯 Exam Tip: Understand that plant indicators provide valuable information about environmental conditions, acting as living sensors for pollution or other changes.

 

Question 35. The international treaty called ............ (1987) was held in Canada on substances that deplete ozone layer.
(a) Montreal Protocol
(b) Kyoto protocol
(c) CDM
(d) CER
Answer: (a) Montreal Protocol
In simple words: The Montreal Protocol is an important international agreement signed in 1987 in Canada. Its main purpose was to stop the use of chemicals that harm the Earth's ozone layer, like CFCs.

🎯 Exam Tip: Identify key international agreements like the Montreal Protocol with their specific goals, such as protecting the ozone layer by phasing out harmful substances.

 

XIII. Two Marks

 

Question 1. Why the green house gases cause global warming
Answer: The greenhouse effect is a natural process where certain gases in the atmosphere trap radiant heat from the sun. This trapping of heat causes the Earth's temperature to rise. The main gases responsible for this heat capture are called Greenhouse gases and include CO2, CH4, and N2O. An easy way to think of it is like a blanket around the Earth, keeping it warm.
In simple words: Greenhouse gases act like a blanket, trapping the sun's heat in our atmosphere and making the Earth warmer.

🎯 Exam Tip: When explaining global warming, clearly state the role of greenhouse gases in trapping heat and leading to an increase in Earth's temperature.

 

Question 2. Draw the pie diagram which shows Relaitive contribution of green house gases.
Answer: The greenhouse effect is a process where gases in the atmosphere trap heat, which raises Earth's temperature. Gases like CO2, CH4, N2O, and CFCs are the main ones that cause this. This pie chart shows how much each contributes to global warming:

In simple words: This chart shows which gases cause the most global warming. Carbon dioxide (CO2) causes the most, followed by methane (CH4), CFCs, and then other gases.

🎯 Exam Tip: When asked to draw a pie diagram, ensure accurate percentages and clearly label each segment with the correct gas and its contribution.

 

Question 3. Why dust and humid night than dust free nights? (or) Does clouds and dust particles cause global warming?
Answer: Yes, clouds and dust particles can also contribute to the greenhouse effect, just like certain gases. This is why nights with clouds and humidity often feel warmer than clear, dry nights without dust. Clouds and dust trap heat near the Earth's surface, acting like an extra blanket. This can also lead to global warming by further enhancing the heat-trapping effect in the atmosphere.
In simple words: Yes, clouds and dust particles can trap heat, making humid, dusty nights warmer. They add to global warming by holding more heat in the air.

🎯 Exam Tip: Remember that while gases are primary, other atmospheric components like clouds and dust also play a role in trapping heat and influencing local temperatures.

 

Question 4. Differentiate bad ozone from good ozone.
Answer:

In simple words: "Bad ozone" is found close to the ground and is harmful, while "good ozone" is high up in the sky and protects us from the sun.

🎯 Exam Tip: Clearly state the location (troposphere vs. stratosphere) and the primary function (harmful pollutant vs. protective shield) for both types of ozone.

 

Question 5. Which is indicating the least ozone part and more ozone part of the atmosphere?
Answer: When we look at color-coded images of the total ozone, different colors show the amount of ozone in the atmosphere. The purple and blue colors indicate where there is the least ozone. On the other hand, the yellows and reds show where there is more ozone. This visual representation helps us understand areas of ozone depletion or concentration. Knowing these color codes helps in monitoring the ozone layer's health.
In simple words: On ozone maps, blue and purple show less ozone, while yellow and red show more ozone.

🎯 Exam Tip: Be able to interpret color scales on scientific diagrams, especially for environmental data like ozone concentration (e.g., blue/purple for low, red/yellow for high).

 

Question 6. What would be the result of ozone depletion on living organisms?
Answer: Ozone depletion has several harmful results for living organisms. UVB radiation from the sun, which is normally blocked by ozone, increases and can destroy biomolecules, leading to skin aging and damage to living tissues. This UV radiation also causes DNA damage, which can increase the risk of skin cancer. Overall, it can harm many life forms by weakening their cells and increasing their chances of developing diseases.
In simple words: Less ozone means more harmful UV rays reach us, which can damage our skin, cells, and DNA, leading to problems like skin cancer.

🎯 Exam Tip: Focus on the direct impacts of increased UV radiation, such as damage to biomolecules, DNA, skin aging, and enhanced cancer risk, as key points.

 

Question 7. Is there any hole in the ozone?
Answer: No, there isn't an actual "hole" in the ozone layer. The term "ozone hole" refers to a severe decline in the thickness of the ozone layer over a specific, restricted area, particularly around the polar regions. This thinning happens when chlorofluorocarbons (CFCs), which are widely used in refrigeration, aerosols, and some industrial cleaning processes, damage the ozone shield. This decline allows more harmful UV radiation to reach Earth's surface.
In simple words: There is no real "hole" in the ozone layer, but it gets very thin in certain places, like over the poles. This thinning happens because chemicals like CFCs damage the ozone.

🎯 Exam Tip: Clarify that the "ozone hole" is a region of significant thinning, not an actual void, and link it directly to the damaging effects of CFCs.

 

Question 8. What are the main objectives of Montreal protocol?
Answer: The main goal of the Montreal Protocol is to gradually stop the production and use of substances that deplete the ozone layer. This international agreement aims to limit the damage these substances cause to the Earth's ozone layer, protecting all life on Earth from harmful ultraviolet radiation. By reducing these ozone-depleting substances, the protocol helps in the recovery of the ozone layer over time.
In simple words: The Montreal Protocol's main goal is to stop making and using chemicals that harm the ozone layer to protect the Earth.

🎯 Exam Tip: State clearly that the Montreal Protocol's core objective is the phase-out of ozone-depleting substances to protect the ozone layer.

 

Question 9. What is Agroforestry?
Answer: Agroforestry is a land-use system that combines trees, crops, and livestock on the same plot of land. Its main objective is to create a beneficial interaction among these components. This approach helps farmers use their land more efficiently, providing multiple products and environmental benefits at the same time. This system can improve soil health and increase overall farm productivity.
In simple words: Agroforestry is a way of farming where trees, crops, and animals are all grown together on the same land to help each other and the farm.

🎯 Exam Tip: Define agroforestry by its key components (trees, crops, livestock) and emphasize the integrated nature of this sustainable land management practice.

 

Question 10. What is silvopasture? (or) What is of degraded forests recreation forestry?
Answer: Silvopasture is a system that combines the production of woody plants with pasture for grazing animals. In this approach, trees and shrubs can be grown to produce fodder for livestock, timber, fuelwood, or fruit. It also helps improve the soil quality. For degraded forests, silvopasture can be a way of recreation forestry, restoring productivity while still allowing for some use. This method helps in both conservation and sustainable resource use.
In simple words: Silvopasture is a farming method where trees are grown on land used for grazing animals. The trees can provide food, wood, or improve the soil.

🎯 Exam Tip: Explain silvopasture by highlighting the intentional combination of trees and livestock for mutual benefits and resource diversification.

 

Question 11. Differentiate Agroforestry and Social forestry
Answer:

In simple words: Agroforestry mixes trees, crops, and animals on one farm. Social forestry is about local communities managing and planting forests for many benefits.

🎯 Exam Tip: Emphasize the integration of different elements in agroforestry versus the community-centric and broader environmental goals of social forestry.

 

Question 12. What could be the causes for deforestation?
Answer: Deforestation is mainly caused by converting forests into agricultural land for crops and livestock ranching. This is a major reason why forests are cleared. Also, developmental activities contribute significantly to deforestation. These include building roads, installing electric power lines, and constructing dams, which all require clearing large areas of forest. These actions often lead to a loss of natural habitats.
In simple words: Forests are cut down mainly to make land for farms and animals. Building roads, power lines, and dams also cause deforestation.

🎯 Exam Tip: When discussing deforestation causes, prioritize the conversion of forest land for agriculture and major infrastructure development projects.

 

Question 13. Who is called as Forest Man of India? Why?
Answer: Jadav Payeng is known as the Forest Man of India. He earned this title because he single-handedly transformed Majuli, the world's largest river island located on the Brahmaputra River, into a dense forest. This forest is now home to many animals like rhinos, deer, elephants, tigers, and various birds, and is larger than Central Park. He was honored for his incredible contributions to environmental conservation. His dedication shows how one person can make a huge difference in ecological restoration.
In simple words: Jadav Payeng is called the Forest Man of India because he alone planted a huge forest on an island, bringing back many animals.

🎯 Exam Tip: For questions about individuals, name the person and clearly state their significant achievement and its impact, such as Jadav Payeng's afforestation efforts.

 

Question 14. What is invasive species?
Answer: An invasive species is a non-native species introduced to an ecosystem that spreads naturally and quickly. These species interfere with native species and pose a serious threat to the ecosystem, often causing significant economic loss. They can outcompete native plants and animals for resources, disrupt food chains, and alter habitats. Their rapid growth and adaptation can make them very difficult to control once established. This can lead to a reduction in local biodiversity.
In simple words: Invasive species are plants or animals that are not from a place but spread fast and harm the native plants, animals, and the environment.

🎯 Exam Tip: Define invasive species by focusing on their non-native origin, rapid spread, and the negative impact they have on native ecosystems and biodiversity.

 

Question 15. Conservation movement – What does it signifies.
Answer: A conservation movement signifies community-level participation in preserving and protecting our environment. It highlights the idea that our environment is a shared treasure for all living organisms on Earth. Therefore, every individual should be aware of this importance and actively participate in programs aimed at conserving the local environment. These movements bring people together to save nature for future generations. Protecting natural resources is a key part of these movements.
In simple words: A conservation movement means people working together to protect our shared environment because it's important for everyone and all living things.

🎯 Exam Tip: Emphasize community participation and the shared responsibility for environmental protection as the core significance of conservation movements.

 

Question 16. What is Five F's? Which is related to what?
Answer: The "Five F's" is a slogan associated with the Chipko movement. The main aim of this movement was to promote self-sufficiency in basic needs for communities by focusing on food, fodder, fuel, fiber, and fertilizer. By securing these five essential resources locally, communities could reduce their dependence on external resources and protect their natural environment. This holistic approach helped communities meet their needs sustainably.
In simple words: The "Five F's" are food, fodder, fuel, fiber, and fertilizer, a slogan from the Chipko movement to help communities get their basic needs locally.

🎯 Exam Tip: Identify the "Five F's" and their connection to the Chipko movement, emphasizing the goal of community self-sufficiency through local resource management.

 

Question 17. Each grove is an abode of a diety mostule Village God (or) Goddesses, like Aiyanar (or) Amman – What does it states?
Answer: This statement describes sacred groves, which are patches of cultivated trees protected by the community based on strong religious beliefs. Each grove is considered the home of a village deity, such as Aiyanar or Amman. This religious connection helps protect these areas, often leading to better conservation of biodiversity. Across Tamil Nadu, 448 such groves have been documented, and some have been studied for their rich plant and animal life. These groves also provide important services to local areas, like protecting watersheds and providing medicinal plants.
In simple words: Sacred groves are forest patches protected by villagers who believe them to be homes of gods, helping to save plants and animals.

🎯 Exam Tip: Explain sacred groves by linking their protection to religious beliefs and highlighting their role in biodiversity conservation and ecosystem services.

 

Question 18. What is Biochar?
Answer: Biochar is a type of charcoal created from burning plant matter, such as crop waste or wood, in a process with very little oxygen. It is considered another long-term method for storing carbon, which helps reduce carbon in the atmosphere. The resulting carbon-rich, slow-decomposing substance is then added to soil. This process is beneficial for both carbon sequestration and improving soil fertility. Biochar can stay in the soil for hundreds to thousands of years.
In simple words: Biochar is a special charcoal made from burnt plants that helps store carbon for a long time and makes soil better.

🎯 Exam Tip: Define biochar by its origin (partly burnt plant matter) and its dual benefits: long-term carbon storage and soil improvement.

 

Question 19. What is carbon foot print?
Answer: A carbon footprint (C.F.P) is the total amount of greenhouse gases produced by human activities. These activities include things like agriculture, industries, deforestation, waste disposal, and burning fossil fuels, either directly or indirectly. Every action we take, from driving a car to eating food, leaves a carbon footprint. It measures our overall impact on the climate in terms of emissions. Understanding this helps us find ways to reduce our impact.
In simple words: A carbon footprint is the total amount of greenhouse gases made by all human activities, like farming, factories, and burning fuel.

🎯 Exam Tip: Explain carbon footprint as the total greenhouse gas emissions resulting from human activities, including both direct and indirect sources.

 

Question 20. What are the benefits related to environmental impact assessment?
Answer: Environmental Impact Assessment (EIA) provides several benefits. It helps ensure a healthier environment by identifying and mitigating potential harm from projects. EIA supports the maintenance of biodiversity by ensuring development doesn't severely damage natural habitats. It also leads to decreased resource usage and promotes sustainable practices. Finally, EIA contributes to a reduction in gas emissions and overall environmental damage, making projects more eco-friendly. This systematic process helps prevent future problems.
In simple words: Environmental Impact Assessment (EIA) helps make sure new projects lead to a healthier environment, protect nature, use fewer resources, and create less pollution.

🎯 Exam Tip: List the benefits of EIA clearly, focusing on healthier environment, biodiversity, resource efficiency, and reduced pollution.

 

Question 21. What is Biomonitoring?
Answer: Biomonitoring is the act of observing and assessing the current state of an ecosystem. This includes monitoring changes in the ecosystem itself, looking at biodiversity components, evaluating the landscape including natural habitats, and observing populations and species. It helps track how healthy an environment is and how it's changing over time. For example, by watching certain species, we can understand if pollution levels are rising or falling. This makes it an important tool for environmental management.
In simple words: Biomonitoring means watching and checking the health of an ecosystem by looking at changes in nature, animals, and plants.

🎯 Exam Tip: Define biomonitoring as the observation and assessment of an ecosystem's current state, including its various components like biodiversity and populations.

 

Question 22. What is Agricultural drone?
Answer: An agricultural drone is an unmanned aerial vehicle (UAV) specifically designed to help with increased crop production and to monitor crops and their growth. Farmers can use these drones to get a "bird's-eye view" of their fields from the sky. This technology makes farming more efficient and precise, helping to manage crops better. For example, they can quickly spot areas that need water or have pests. This saves time and resources.
In simple words: An agricultural drone is a flying robot that helps farmers grow more crops and watch their fields from above.

🎯 Exam Tip: Describe agricultural drones as UAVs used for crop production, monitoring, and enabling farmers to get an aerial view of their fields.

 

Question 23. What are the uses of agricultural drone (or) Bio monitoring?
Answer: Agricultural drones are used for many purposes, including biomonitoring. These "bird's-eye view" instruments can detect various issues like irrigation problems, changes in soil, and pest or fungal infestations. They are also a cost-effective and safe method for spraying pesticides and fertilizers. This helps farmers manage their fields more efficiently and respond quickly to problems. Using drones saves time and helps keep crops healthy.
In simple words: Agricultural drones help find farm problems like watering issues, bad soil, or pests. They also safely spray pesticides and fertilizers.

🎯 Exam Tip: When listing uses of agricultural drones, focus on their role in identifying problems (irrigation, pests, soil) and efficient application of treatments.

 

Question 24. What Geographic Information system?
Answer: A Geographic Information System (GIS) is a computer system designed for capturing, storing, checking, and displaying data related to positions on the Earth's surface. It can also manipulate, analyze, manage, and present special or geographic data. For example, GIS can be used in mining, surveying, agricultural planning, and marine ecosystem studies. This system helps us understand spatial relationships and patterns in environmental data. It's like a smart map that can show many layers of information.
In simple words: GIS is a computer system that collects, stores, and shows information about places on Earth, like maps, to help us understand different locations.

🎯 Exam Tip: Define GIS as a computer system for handling geospatial data, emphasizing its capabilities for capturing, storing, analyzing, and displaying information.

 

Question 25. What are the scope of GPS satellite? (or) (Global Positioning System)
Answer: The Global Positioning System (GPS) is a satellite navigation system used to find the exact ground position of an object. Its scope involves a constellation of approximately 30 well-spaced satellites orbiting the Earth. These satellites work together to make it possible to determine precise geographic locations anywhere on the planet. GPS is used in many fields, including mining, surveying, agriculture, and marine ecosystems, providing accurate location data for various applications. It has become essential for modern navigation and mapping.
In simple words: GPS satellites help us find exact locations on Earth. They are used for navigation and mapping in many areas like mining and farming.

🎯 Exam Tip: Explain GPS by focusing on its function as a satellite navigation system for determining precise geographic positions and its wide range of applications.

 

Question 26. Which is providing exact picture and data on identification of even a single tree to large area and wild lifor for classification?
Answer: Remote sensing is the process that provides exact pictures and data for identifying and classifying even single trees across large areas, including wildlife. It involves detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation from a distance. This technology is a powerful tool in conservation practices, as it helps create detailed maps of vegetation and wildlife. For example, it can track forest fires or map species distribution, making it invaluable for environmental management. Remote sensing gives us a clear overview that's impossible to get from the ground.
In simple words: Remote sensing takes detailed pictures from far away to identify single trees, large forests, and wildlife, helping us to classify them.

🎯 Exam Tip: Highlight remote sensing's ability to provide detailed, large-scale data for classification and monitoring, particularly for individual features like trees and wildlife.

 

Question 27. What are green house gases?
Answer: Greenhouse gases are gases in Earth's atmosphere that trap heat. They are responsible for the greenhouse effect, which warms the planet. These gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFCs). They absorb heat that radiates from the Earth's surface and then re-emit it, causing the atmosphere to warm. This natural process is important for keeping Earth warm enough to live on, but too many greenhouse gases can lead to global warming. Each gas has different sources and heat-trapping abilities.
In simple words: Greenhouse gases are gases in the air, like CO2 and methane, that trap heat from the sun and keep our planet warm.

🎯 Exam Tip: List the primary greenhouse gases (CO2, CH4, N2O, CFCs) and explain their fundamental role in trapping heat and contributing to the greenhouse effect.

 

Question 28. If you buy imported fruit like Kilvi indirectly it increases (GFP) carbon foot print. How?
Answer: If you buy imported fruit like kiwi, it indirectly increases the carbon footprint because the fruit has traveled a long distance. This travel often involves shipping by sea or air, and these transportation methods burn a lot of fossil fuels. Burning fossil fuels releases tons of CO2 into the atmosphere. The farther the fruit travels, the more fuel is used, and the larger its carbon footprint becomes. This shows how choices like buying local food can help reduce environmental impact.
In simple words: Buying imported fruit increases the carbon footprint because it travels long distances by ships or planes, which burn fuel and release a lot of CO2.

🎯 Exam Tip: Explain how transportation distances for imported goods contribute significantly to carbon footprints due to fossil fuel consumption.

 

Question 29. Which is names of Alien invasive species?
Answer: Some common alien invasive species include Eichhornia crassipes (water hyacinth), Prosopis juliflora (mesquite), and Parthenium hysterophorus (carrot grass). These species are not native to the areas where they cause problems. They spread quickly, outcompete native plants, and can harm the local ecosystem and biodiversity. For example, water hyacinth can cover water bodies, blocking sunlight and reducing oxygen for aquatic life. Knowing these names helps in identifying and managing such harmful species. Each of these can significantly alter an ecosystem.
In simple words: Alien invasive species are plants like water hyacinth, mesquite, and carrot grass, which are not from here and cause problems for local plants and animals.

🎯 Exam Tip: Provide clear examples of alien invasive species and briefly mention their common names and why they are considered invasive.

 

Question 1. What are the effects of Green House Gases? Give example.
Answer: An increase in greenhouse gases causes permanent changes in the ecosystem and weather patterns. For example, coral bleaching happens when corals lose their color and health due to warmer ocean temperatures. This change negatively impacts the marine ecosystem.
In simple words: More greenhouse gases lead to lasting changes in nature and weather. Coral bleaching is an example, where warmer waters hurt corals.

🎯 Exam Tip: When discussing environmental effects, always try to link the cause to a specific, observable consequence, like coral bleaching for warmer temperatures.

 

Question 2. Why we want to control global warming? Write the (or) effects of global warming.
Answer: We need to control global warming because rising global temperatures cause sea levels to go up. This happens as polar ice caps and glaciers melt, which could make many coastal cities around the world go underwater. It is crucial to act now to protect our future.
In simple words: We must stop global warming because it makes oceans rise as ice melts, threatening to flood many cities.

🎯 Exam Tip: Focus on the direct and significant impacts of global warming, such as sea level rise and its threat to coastal areas, to highlight the urgency.

 

Question 3. What are the reasons for global warming?
Answer: There are several reasons for global warming:
• A big rise in population has increased the need for more food, fibers, and fuels.
• This greater demand has led to many environmental issues in farming and land use.
• We are losing biodiversity and land quality, which also reduces the amount of fresh water available. All these human activities contribute to global warming.
In simple words: Global warming is caused by more people needing more things, which leads to farming issues, loss of diverse plants and animals, and less clean water.

🎯 Exam Tip: When explaining causes of environmental issues, always connect human activities directly to their impact on nature. Think of a chain reaction.

 

Question 4. Global warming is a threatening problem nowadays. What are the stratifies to deal with it?
Answer: To deal with global warming, we need to use several strategies:
• We should increase the amount of plants and trees growing everywhere.
• We need to use less fossil fuels, like coal and oil, and reduce other greenhouse gases.
• We also need to use less nitrogen fertilizers and aerosols.
These steps help to keep the Earth's climate stable.
In simple words: To fight global warming, we must plant more trees, use less fossil fuels and greenhouse gases, and reduce nitrogen fertilizers and aerosols.

🎯 Exam Tip: When suggesting solutions, provide clear, actionable steps that address the root causes of global warming, such as reducing emissions and increasing natural carbon sinks.

 

Question 5. Why ozone layer is known as ozone shield?
Answer: The ozone layer is a part of Earth's upper atmosphere, called the stratosphere. It absorbs most of the sun's harmful ultraviolet (UV) radiation. Because it protects life on Earth from this dangerous radiation, it is called the "ozone shield." This protective layer is vital for all living organisms.
In simple words: The ozone layer is called an ozone shield because it blocks most of the sun's harmful UV rays from reaching Earth.

🎯 Exam Tip: Clearly state the function of the ozone layer and directly explain why its protective role earns it the name "ozone shield."

 

Question 6. What is Dobson unit?
Answer: The Dobson Unit (DU) is a special unit used to measure the total amount of ozone in the atmosphere. One Dobson Unit means that if all the ozone in a column of air was brought down to the Earth's surface at 0°C and normal pressure, it would form a layer 0.01 millimeters thick. The total ozone layer above the Earth's surface is usually about 0.3 centimeters (or 3 millimeters) thick. This measurement helps scientists track changes in the ozone layer.
In simple words: A Dobson Unit measures how much ozone is in the air. If all the ozone was squished to the ground, one DU would be a very thin layer, like 0.01 mm.

🎯 Exam Tip: When defining scientific units, provide both the numerical equivalent and a simple explanation of what it measures, along with a real-world context if possible.

 

Question 7. Can we see ozone layer?
Answer: No, we cannot directly see the ozone layer with our eyes. Even though it is not very dense, it causes a faint blue color in the sky, especially at very low concentrations. Scientists use satellites to visualize and study the ozone layer's changes and thickness. These tools help us understand its condition.
In simple words: We cannot see the ozone layer. It gives the sky a light blue color, and satellites are used to observe it.

🎯 Exam Tip: Distinguish between direct human perception and scientific observation methods when answering questions about invisible atmospheric phenomena.

 

Question 8. Why was Montreal protocol signed?
Answer: The Montreal Protocol was signed because research in the 1970s showed that human-made chlorofluorocarbons (CFCs) were destroying ozone molecules in the atmosphere. The Vienna Convention set up the framework for rules to protect the ozone layer. The Montreal Protocol then created specific rules to reduce the production and use of substances that harm the ozone layer. This global agreement helped prevent more damage to the ozone layer.
In simple words: The Montreal Protocol was signed because CFCs were harming the ozone layer. It created rules to stop making those harmful chemicals.

🎯 Exam Tip: When explaining international protocols, remember to mention the problem it addresses, the key substances involved, and its main goal.

 

Question 9. What is Montreal protocol? What is its aim?
Answer: The Montreal Protocol is an international agreement signed in Canada in 1987. Its main goal is to gradually stop the production and use of substances that deplete the ozone layer. This helps to limit the damage to Earth's ozone layer. The protocol aimed to phase out chemicals like CFCs that harm our atmosphere.
In simple words: The Montreal Protocol is a global agreement from 1987. It aims to slowly stop making chemicals that destroy the ozone layer to protect Earth.

🎯 Exam Tip: Ensure you include the year and location of the protocol, its primary objective, and the specific type of substances it targeted for full marks.

 

Question 10. What is clean development mechanism (or) Kyoto protocol?
Answer: The Clean Development Mechanism (CDM), established under the Kyoto Protocol (2007), is a project-based system with two main goals. First, it helps prevent dangerous climate change and reduces greenhouse gas emissions. Second, it helps countries lower their emissions and encourages sustainable development. For example, replacing old power plants with solar panels or energy-efficient boilers is a CDM activity. These actions benefit both the environment and local communities.
In simple words: The Clean Development Mechanism, from the Kyoto Protocol, helps reduce climate change and emissions while promoting sustainable projects like solar power.

🎯 Exam Tip: When describing mechanisms like CDM, explain both their environmental and developmental benefits, and provide a clear, real-world example.

 

Question 11. Differentiate protein Bank from live fence of fodder trees and hedges.
Answer:

In simple words: Protein banks are tree plantings for animal feed, while live fences are tree lines used as barriers against wandering animals.

🎯 Exam Tip: When differentiating, clearly state the main purpose and provide examples for each category. Use contrasting words to highlight the differences.

 

Question 12. What is social forestry?
Answer: Social forestry is about managing forests in a way that helps local communities sustainably. It involves reducing pollution, stopping deforestation, restoring forests, and creating jobs indirectly. This approach also focuses on carefully managing existing forests and planting new trees in barren areas. It is a community-led effort for environmental improvement.
In simple words: Social forestry helps local communities manage forests sustainably, reducing pollution, restoring trees, and creating jobs.

🎯 Exam Tip: Define social forestry by emphasizing its community involvement, environmental benefits (depollution, reforestation), and socio-economic outcomes (indirect employment).

 

Question 13. Why forestry extension centres are important? (or) What ae the major activities of forestry extension centre?
Answer: Forestry extension centers are important because they do many activities to help grow and protect forests:
• They offer training on how to grow trees.
• They share information about growing trees with the public.
• They help provide tree seedlings at a lower cost.
• They teach school children and young people about how important forests are through training programs. These centers play a key role in raising awareness and skill development.
In simple words: Forestry centers are important because they teach people how to grow trees, give out saplings, and educate children about forests.

🎯 Exam Tip: When listing activities, use clear bullet points and focus on the practical ways these centers support forestry, from education to resource provision.

 

Question 14. Forest, soil, ocean are called natural sink why? (or) What is carbon sink?
Answer: A carbon sink is any system that can collect and store more carbon from the atmosphere over a period of time than it releases. Forests, soil, and oceans are called natural carbon sinks because they naturally absorb large amounts of carbon dioxide. For example, landfills are artificial sinks, while forests, soil, and oceans are natural sinks, actively removing carbon from the air. These systems are crucial for regulating Earth's climate.
In simple words: A carbon sink is something that takes in and stores more carbon than it lets out. Forests, soil, and oceans are natural carbon sinks because they absorb CO2 from the air.

🎯 Exam Tip: Clearly define a carbon sink and then provide distinct examples of natural sinks, explaining briefly why each qualifies as one.

 

Question 15. Why Eichhorinia crassipes is called Terror of Bengal?
Answer: Eichhornia crassipes is called the "Terror of Bengal" because it grows very fast and widely, severely impacting aquatic ecosystems. Its rapid growth harms the small plants that float in the water (phytoplankton), which are the base of the food chain. This water weed also lowers the oxygen content in water bodies, leading to eutrophication, which is harmful to aquatic life. Furthermore, it creates places where mosquitoes and snails can breed, posing a threat to human health.
In simple words: Eichhornia crassipes is called the "Terror of Bengal" because it grows very fast, harming water plants, reducing water oxygen, and creating breeding spots for mosquitoes and snails.

🎯 Exam Tip: When explaining why a species is considered invasive, detail its specific ecological impacts (e.g., impact on phytoplankton, oxygen levels) and any direct threats to human well-being.

 

Question 16. Differentiate Chipko movement and Appiko movement.
Answer:

In simple words: The Chipko movement involved hugging trees to save them, starting in the Himalayas. The Appiko movement, inspired by Chipko, was a protest against tree felling in Karnataka.

🎯 Exam Tip: When differentiating, clearly state the primary action, geographic location, and key leaders for each movement. Highlight their shared goal of forest protection.

 

Question 17. Differentiate in - Situ conservation and ex-site conservation.
Answer:

In simple words: In-situ conservation protects plants and animals in their natural habitats. Ex-situ conservation protects them outside their natural homes, like in zoos or botanical gardens.

🎯 Exam Tip: For clear differentiation, define each method and provide specific examples for each, highlighting whether protection occurs inside or outside the natural habitat.

 

Question 18. What is Geological sequent ration?
Answer: Geological sequestration is a process where carbon dioxide is captured and stored permanently deep underground in safe sites. These sites include declining oil and gas fields or deep saline aquifers, at a depth of 1 kilometer or more. It can also involve storing liquid carbon dioxide in the ocean or solid storage by reducing it with metal oxides to form stable carbonates. This technology aims to mitigate global warming by keeping carbon out of the atmosphere.
In simple words: Geological sequestration is a way to trap carbon dioxide and store it deep underground or in oceans forever, stopping it from going into the air.

🎯 Exam Tip: Define the process, mention the depth and types of storage sites (underground rocks, ocean, solid carbonates), and state its overall purpose (mitigating global warming).

 

Question 19. Write the benefits of environmental impact assessment.
Answer: The benefits of environmental impact assessment (EIA) include:
• It helps create a healthier environment for everyone.
• It helps protect and maintain biodiversity.
• It leads to less use of natural resources.
• It reduces harmful gas emissions and environmental damage. EIA makes sure that development is done in a way that protects nature and human well-being.
In simple words: Environmental impact assessment helps make our environment healthier, protects diverse life, uses fewer resources, and reduces pollution.

🎯 Exam Tip: When listing benefits, focus on concrete outcomes related to public health, ecosystem protection, and sustainable resource management.

 

Question 20. What is environmental impact assessment?
Answer: Environmental Impact Assessment (EIA) is a tool used to manage the environment. It helps to control and suggest the best ways to use natural resources while having the smallest possible effect on ecosystems and communication between living things. EIA is a key step in planning projects to ensure they are environmentally sound.
In simple words: Environmental impact assessment is a tool that helps manage natural resources to reduce harm to nature and living things.

🎯 Exam Tip: Define EIA as a management tool and explain its dual purpose: regulating resource use and minimizing negative impacts on ecosystems.

 

Question 21. What is Bio - diversity impact Assessment?
Answer: Biodiversity Impact Assessment (BIA) is a decision-making tool. It helps in planning and implementing development projects in a way that includes and protects biodiversity. BIA helps us understand how new projects might affect the variety of life in an area before they are started.
In simple words: Biodiversity Impact Assessment is a tool that helps make decisions about projects to protect different kinds of life and nature.

🎯 Exam Tip: Emphasize that BIA is a proactive decision-making tool specifically for biodiversity, used during planning and implementation of projects.

 

Question 22. How Bio – diversity impacts can be assessed?
Answer: Biodiversity impacts can be assessed by looking at several factors:
• Changes in how land is used and covered, like converting forests to farms.
• Fragmentation and isolation of habitats, which means breaking up natural areas into smaller, separate pieces.
• Extraction of resources, such as cutting down trees or mining.
• External inputs like pollution from emissions, effluents, and chemicals.
• Introduction of invasive, alien, or genetically modified species that can harm local ecosystems.
• The impact on native plants and animals that are under threat. By examining these, we can understand how human activities affect biodiversity.
In simple words: We can check biodiversity impacts by looking at land changes, broken habitats, resource removal, pollution, new species, and harm to native plants and animals.

🎯 Exam Tip: Provide a comprehensive list of measurable indicators (land use, habitat, pollution, species introduction) that help evaluate the impact on biodiversity.

 

Question 23. Write a short note on production of methane?
Answer: Methane is a potent greenhouse gas, about 20 times more effective than carbon dioxide at trapping heat in the atmosphere. Its sources include paddy cultivation (rice fields), cattle rearing (from their digestion), bacteria in water bodies, the production of fossil fuels, and natural fires in non-wetland soils and forests. Understanding these sources helps in managing methane emissions. Methane plays a significant role in global warming due to its strong heat-trapping ability.
In simple words: Methane is a strong greenhouse gas that traps a lot of heat. It comes from rice fields, cows, water bacteria, fossil fuels, and fires.

🎯 Exam Tip: When describing methane, mention its potency as a greenhouse gas relative to CO2, and list diverse natural and anthropogenic sources.

 

Question 24. Write a note on (N2O) Nitrous Oxide?
Answer: Nitrous oxide (N2O) is another greenhouse gas. It occurs naturally in oceans from biological processes in soil and water, and in rainforests due to microbial actions. Human-made sources include the production of nylon and nitric acid, the use of fertilizers in agriculture, animal manures, cars with catalytic converters, and the burning of organic matter. N2O is a long-lived gas that contributes to global warming and ozone depletion. Controlling its emissions is important for environmental health.
In simple words: Nitrous oxide (N2O) comes from oceans, soil, and rainforests naturally. Human activities like making nylon, using fertilizers, and car exhaust also create it.

🎯 Exam Tip: For N2O, include both its natural and human-caused sources, highlighting its impact on both global warming and ozone depletion.

 

Question 25. Write the significances of lakes.
Answer: Lakes and ponds are very important because they offer many environmental benefits and also help our economy and quality of life. They store rainwater, which provides drinking water and helps raise groundwater levels. Lakes also preserve the biodiversity of freshwater habitats and keep them healthy. They act as vital ecosystems, supporting various plant and animal species.
In simple words: Lakes are important for the environment and people. They store rainwater, give us drinking water, help groundwater, and protect many different kinds of life.

🎯 Exam Tip: When discussing the significance of natural features, clearly state their ecological roles (e.g., biodiversity, water regulation) and their direct benefits to human society.

 

XV. Five Marks

 

Question 1. Define Global warming. Write the reasons for it what are green hours Gases? What are the human activities lead to produce green house effect?
Answer:
Global Warming
Global warming is the increase in the average temperature of Earth's atmosphere and oceans. It happens mainly because of the increased amounts of greenhouse gases in the air. This rise in temperature affects climates all over the world.

Reasons for Global Warming
• A sharp increase in population has led to a higher demand for food, fibers, and fuels. This demand puts pressure on natural resources.
• This has caused many environmental problems in agriculture, changed how land is used, led to a loss of biodiversity, and degraded land. It has also reduced fresh water availability, all of which contribute to global warming.

Greenhouse Gases
The gases that trap heat in the atmosphere are called greenhouse gases. These include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFCs). These gases are essential for keeping Earth warm, but too much of them causes problems.

Human Activities Leading to Greenhouse Effect
Human activities that increase the greenhouse effect include:
• Burning fossil fuels, which releases CO2 and CH4.
• Agricultural practices, like certain farming methods and animal husbandry.
• Using electrical items such as refrigerators and air conditioners, which release CFCs.
• Using fertilizers in agriculture, which releases N2O.
• Emissions from cars and other vehicles.
In simple words: Global warming is when Earth gets hotter because too many greenhouse gases (like CO2, methane) are in the air. This happens from burning fuels, farming, using certain appliances, and car exhaust.

🎯 Exam Tip: For comprehensive answers like this, break it down into clear sub-sections. Define terms first, then list causes, specific gases, and human activities in an organized manner.

 

Question 2. Write about Natural and anthropogenic sources of Green House Gases Emission.
Answer:
CO2 (Carbon Dioxide)
• A major human source is coal-based power plants, which burn fossil fuels to generate electricity. This releases large amounts of CO2.
• Burning fuels in car engines, commercial vehicles, and aircraft also contribute significantly to global warming. This is why reducing our reliance on fossil fuels is so important.
• Agricultural practices, such as burning crop stubble, also result in CO2 emissions.
• Natural sources include organic matter decay, volcanoes, warm oceans, and sediments. These natural processes have always been a part of Earth's carbon cycle.

Methane
• Methane is a very powerful greenhouse gas, about 20 times stronger than CO2 at trapping heat in the atmosphere. It is a significant contributor to global warming.
• Its sources include paddy cultivation (rice paddies), cattle rearing (due to their digestive processes), bacteria in water bodies, fossil fuel production, oceans, non-wetland soils, and forest/wildfires. These diverse sources make methane a challenging gas to control.

N2O (Nitrous Oxide)
• Nitrous oxide is naturally produced in oceans from biological sources in soil and water, and in rainforests through microbial actions. These are part of the natural nitrogen cycle.
• Human-made sources include the production of nylon and nitric acid, the use of fertilizers in agriculture, animal manures, cars with catalytic converters, and the burning of organic matter. Understanding these sources is key to reducing N2O emissions.
In simple words: Greenhouse gases come from natural things like volcanoes and rotting plants, and from human things like burning fuel for cars and power, farming, and using some machines. Each gas, like CO2, methane, and N2O, has its own main sources.

🎯 Exam Tip: For each greenhouse gas, differentiate clearly between natural and human-caused (anthropogenic) sources. Provide specific examples for each category to demonstrate full understanding.

 

Question 3. What are the effects of Global warming on plants? (or) What are the changes may occur on plants and climate due to global warming?
Answer: Global warming causes several changes that affect plants and climate:
• It can lead to low agricultural productivity in tropical regions, meaning less food grown.
• More frequent heat waves can occur, which increases weeds, pests, and fungi that thrive in warmer temperatures.
• There is an increase in disease carriers (vectors) and the spread of epidemics.
• Strong storms and severe flood damage become more common.
• Water crises and reduced irrigation affect plant growth.
• Changes in flowering seasons and the behavior of pollinators disrupt plant reproduction.
• Shifts in where different species can live (distributional ranges) lead to some species speaking of extinction. Overall, these changes threaten plant life and ecosystems.
In simple words: Global warming means less food grows in hot places, more pests, more floods, less water, changed flowering times, and some plants might disappear forever.

🎯 Exam Tip: When discussing effects on plants and climate, provide a range of impacts, from agricultural productivity and pest issues to extreme weather and biodiversity loss.

 

Question 4. The presence (or) absence of certain plants indicates the state of environment by its response. What does it called ? Give some examples.
Answer: This phenomenon is called Plant Indicators. Plants indicators are species that show the state of the environment by their presence, absence, or growth. Here are some examples:

In simple words: Some plants are like natural sensors; they show how clean or polluted an area is. For example, lichens tell us about air pollution, and petunias tell us about nitrate in the soil.

🎯 Exam Tip: Define plant indicators clearly and present examples in a table format, linking specific plants to the type of environmental condition they indicate.

 

Question 5. If the ozone layer is affected, U-V radiations on the sun will reach the earth surface and sure many damage. Can you list out some effects of ozone depletion?
Answer: If the ozone layer is damaged, more harmful UV radiation from the sun will reach Earth, causing many problems. The main effects of ozone depletion are:
• It increases the number of young animals dying and leads to more mutations (changes in genetic material).
• It increases health issues like cataracts, irritation in the throat and lungs, emphysema, and skin cancer.
• In plants, the chemicals needed for photosynthesis are affected, which slows down photosynthesis. This can lead to less food being produced.
• Decreased photosynthesis results in more CO2 in the atmosphere, increasing global warming and potentially causing food shortages.
• Changes in temperature alter climate and rainfall patterns, leading to floods, droughts, rising sea levels, and an imbalance in ecosystems, which harms various plants and animals. The immune system also functions less effectively.
In simple words: When the ozone layer is damaged, more harmful sun rays hit Earth. This causes animal deaths, mutations, eye and lung problems, skin cancer, less food from plants, more global warming, floods, droughts, rising sea levels, and a weaker immune system.

🎯 Exam Tip: When listing effects, categorize them into impacts on living organisms (animals, humans, plants) and broader environmental consequences (climate change, sea level). Ensure the link to UV radiation is explicit.

 

Question 6. Write an essay on ozone.
Answer:
Ozone Shield
The ozone layer is a vital part of Earth's stratosphere. It acts like a shield, absorbing most of the sun's dangerous ultraviolet (UV) radiation. This protection is crucial for life on Earth, which is why it's often called the "ozone shield." Without this shield, living organisms would be exposed to harmful radiation.

Ozone Hole
Despite its strength, the ozone shield can be damaged. Chlorofluorocarbons (CFCs), widely used in refrigeration, aerosols, and as industrial cleaning agents, significantly harm the ozone. When the ozone layer's thickness declines over a specific area, it is referred to as an "ozone hole." While not an actual hole, it indicates a severe thinning of this protective layer.

Montreal Protocol
To address this problem, the Montreal Protocol was signed in the 1970s. Research at that time showed that human-made CFCs were reducing and changing ozone molecules in the atmosphere. The protocol established a framework for countries to reduce and eventually phase out the production and consumption of ozone-depleting substances. This international treaty, signed in Canada in 1987, aims to eliminate the damage to Earth's ozone layer and limit future harm.
In simple words: The ozone layer protects us from harmful sun rays, acting like a shield. But chemicals like CFCs can damage it, creating an "ozone hole" (a thin spot). The Montreal Protocol was made to stop making these chemicals and protect the ozone layer.

🎯 Exam Tip: For an essay on ozone, cover its role as a shield, the causes and meaning of the "ozone hole," and the international efforts (like the Montreal Protocol) to protect it. Structure with clear headings.

 

Question 7. Write the objectives and achievements of Afforestation.
Answer:
**Afforestation Objectives:**
• To increase forest cover by planting more trees.
• To improve air quality and increase oxygen production.
• To rehabilitate degraded forests, helping them absorb more carbon dioxide from the atmosphere.
• To encourage raising bamboo plantations. Afforestation aims to create a healthier, more balanced environment through tree planting.
In simple words: Afforestation means planting trees to make forests bigger. It helps clean the air, brings back damaged land, and uses up carbon dioxide.

🎯 Exam Tip: Mention specific benefits like carbon sequestration and improved air quality to score full marks for afforestation objectives.

 

Question 8. What is Bio-Diversity conservation movement.
Answer:
**Conservation movement**
A biodiversity conservation movement is when local communities work together to protect nature. This means preserving the environment, which is valuable for all living things. Everyone should know about these efforts and take part in local programs to save nature. Many historical movements in India show how communities can successfully protect their environment. Protecting diverse life forms helps maintain ecological balance.
In simple words: A biodiversity conservation movement is when communities join hands to protect nature and its many types of life. Everyone should help save the environment and join local efforts.

🎯 Exam Tip: Define community involvement and the goal of preserving diverse life forms for a complete answer on conservation movements.

 

Question 9. Write about endemic centre's and endemic plants.
Answer:
Endemic plants and centers refer to species that are found naturally only in a specific geographic area. These species might be restricted to one place because they are isolated, interact only with specific local species, or have problems spreading their seeds. India has three large endemic centers and 27 smaller ones, including the Himalayas, Peninsular India, and the Andaman Nicobar Islands. Many endemic plants belong to families like Poaceae and Orchidaceae. Such unique species highlight the importance of protecting specific habitats.

In simple words: Endemic plants and centers are about plants and animals found only in one special place. India has several such places, like the Western Ghats. These species need protection because they don't live anywhere else.

🎯 Exam Tip: Clearly define "endemic" and provide examples of both plants and their specific locations for a comprehensive answer.

 

Question 10. Write about two approach to mitigate global warming.
Answer:
**Carbon Capture and Storage (CCS)**
One way to reduce global warming is Carbon Capture and Storage (CCS). This technology captures carbon dioxide from the air and stores it deep underground, often more than 1 kilometer deep. Scientists look for safe places like old oil and gas fields, saline aquifers, or unmineable coal seams for this storage. Liquid CO2 can also be stored in the ocean, or it can be converted into solid carbonates with metal oxides. This process prevents harmful \( \text{CO}_2 \) from entering the atmosphere.
**Carbon Sequestration**
Carbon sequestration is the overall process of capturing and storing carbon dioxide to reduce its amount in the atmosphere and fight climate change. This can happen naturally, like when plants absorb \( \text{CO}_2 \) or when oceans store it. On land, forest and soil conservation methods help keep carbon locked away. Even tiny marine plants like Chlorella and Scenedesmus, and larger seaweeds, are used to capture carbon globally. Effectively, carbon is removed from the air and put into long-term storage.
In simple words: Carbon Capture and Storage (CCS) takes carbon dioxide out of the air and puts it deep underground. This stops the gas from making the Earth warmer. Carbon sequestration is the broader idea of taking and storing carbon.

🎯 Exam Tip: For CCS, mention both the capture and storage aspects, including the depth and types of storage sites. For carbon sequestration, define it as reducing atmospheric carbon through natural or artificial means.

 

Question 11. What is Carbon foot print ? How will you reduce this CFP?
Answer:
**Carbon Foot Print (CPF)**
A carbon footprint is the total amount of greenhouse gases, like carbon dioxide, released into the atmosphere by human activities. This includes everything from farming and industries to cutting down forests and burning fossil fuels. It is like an invisible mark we leave on the planet. Understanding our carbon footprint helps us make choices that are better for the Earth.
**To Reduce Carbon Foot Print**
To reduce your carbon footprint, you can make several daily changes. This includes using fewer electronic devices and traveling less. Try to avoid buying heavily processed and packaged foods. Planting a garden can also help. Eating less meat and seafood is beneficial, as poultry farming, for example, needs less space and causes less pollution than cattle farming. Even simple actions like line-drying clothes instead of using a dryer contribute to a smaller carbon footprint. All these small steps add up to a big difference.
In simple words: Your carbon footprint is all the greenhouse gases you cause to be released, for example, by what you eat or how you travel. You can make it smaller by using less energy, traveling less, and choosing local foods.

🎯 Exam Tip: When defining carbon footprint, ensure you mention it is the total greenhouse gases, not just carbon dioxide, and link it to human activities. For reduction, provide diverse and practical examples.

 

Question 12. Write an essay on Environmental impact Assesment and its benefits.
Answer:
**Environmental Impact Assessment (EIA)**
Environmental Impact Assessment (EIA) is a tool for managing the environment. It helps plan how to use natural resources wisely, making sure there is very little harm to ecosystems and living things. EIA predicts what will happen to the environment if big projects like dams or highways are built. By doing this, it helps lower environmental stress, encouraging better use of resources and proper waste disposal to prevent damage. A key advantage is its ability to foresee problems before they occur, allowing for proactive solutions.
**The benefits of EIA to society**
• A healthier environment
• Maintenance of biodiversity
• Decreased resource usage
• Reduction in gas emission and environment damage.
In simple words: EIA is a tool that checks how big projects might harm nature. It helps to use resources carefully, lower pollution, and protect different types of life, leading to a healthier environment.

🎯 Exam Tip: When explaining EIA, define it as a management tool, describe its purpose (predicting consequences, minimizing impact), and list specific benefits like protecting biodiversity.

 

Question 13. Write about Bio-diversity impact Assesment and How will you anses its impact.
Answer:
**Biodiversity Impact Assessment (BIA)**
A Biodiversity Impact Assessment (BIA) is a tool that helps make decisions about development projects. It ensures that planning and carrying out these projects consider and protect the many different types of life (biodiversity). This assessment also checks the impact on local, unique plants and animals. BIA helps us build things while safeguarding the natural world.
**Bio-diversity Impacts can be assessed by**
• Changes in land use and cover.
• Fragmentation and isolation of habitats.
• Extraction of natural resources.
• External inputs such as emissions, effluents, and chemicals.
• Introduction of invasive, alien, or genetically modified species.
• Impact on endemic and threatened flora and fauna.
In simple words: BIA is a tool to check how building projects affect nature's plants and animals. It helps us understand if we are changing land too much, adding harmful things, or bringing in new species that might harm the local ones.

🎯 Exam Tip: Clearly define BIA as a decision-making tool for development. Mention various factors for assessment, such as land use, invasive species, and impact on local flora and fauna.

 

Question 14. What is Geographic Information system? What are its importance?
Answer:
**Geographic Information System**
A Geographic Information System (GIS) is a computer system that captures, stores, checks, and shows data linked to specific places on Earth. It also helps to sort, look at, manage, and display geographical information. The Global Positioning System (GPS), which uses about 30 satellites orbiting Earth, helps find the exact location of any object on the ground. GIS is a very powerful tool for understanding our planet's features and managing resources effectively.
**Importance of GIS**
• Environmental impact assessment.
• Disaster management.
• Zoning of landslide hazards.
• Determination of land cover and land use.
• Estimation of flood damage.
• Management of natural resources.
• Soil mapping and wetland mapping.
• Irrigation management and identification of volcanic hazards.
• Vegetation studies and mapping of threatened and endemic species.
In simple words: GIS is a computer system that uses location data from Earth to create maps and understand places. It is important for checking nature's health, planning for disasters, mapping land, and understanding where special plants and animals live.

🎯 Exam Tip: Distinguish between GIS as a system for data management and GPS as a satellite-based positioning system. Highlight their combined utility for geographic data analysis and various applications.

 

Question 15. What is Remote sensing and what are its uses?
Answer:
**Remote Sensing**
Remote sensing is a way to gather information about an area without actually touching it. It works by measuring the light and heat that bounce off the Earth's surface from a distance, often using satellites. This tool is very useful for conservation because it can provide detailed images and data, even showing single trees or large areas of plants and animals. It helps in mapping forest fires, seeing where different species live, and finding resources on the ocean floor.
**Applications of Satellites**

In simple words: Remote sensing uses satellites to take pictures and collect data about Earth from far away. It helps us see things like forest fires, types of plants, and even the ocean floor, and is used for weather and disaster prediction.

🎯 Exam Tip: Explain remote sensing as gathering data from a distance, usually via satellites. Provide specific examples of its uses, such as mapping and disaster management, and mention a couple of relevant satellites.