Samacheer Kalvi Class 12 Economics Solutions Chapter 10 Environmental Economics

Part- A

Multiple Choice questions

 

Question 1. The term environment has been derived from a French word ...............
(a) Environ
(b) Environs
(c) Environia
(d) Envir
Answer: (c) Environia
In simple words: The word "environment" comes from the Old French word "environia", which means "to surround". It describes everything that surrounds us.

🎯 Exam Tip: Knowing the origin of key terms can help you understand their meaning better and make it easier to recall the answer in an exam.

 

Question 2. The word biotic means environment
(a) living
(b) non - living
(c) physical
(d) None of the options
Answer: (a) living
In simple words: Biotic refers to anything that is alive or was once alive in an ecosystem. This includes all plants, animals, and microorganisms.

🎯 Exam Tip: Distinguish between 'biotic' (living) and 'abiotic' (non-living) components as this is a fundamental concept in environmental studies.

 

Question 3. Ecosystem is smallest unit of
(a) Ionosphere
(b) Lithosphere
(c) Biosphere
(d) Mesosphere
Answer: (c) Biosphere
In simple words: An ecosystem is like a tiny world within the larger biosphere where living things and their non-living surroundings work together. The biosphere is the total sum of all ecosystems on Earth.

🎯 Exam Tip: Remember that the biosphere is the largest ecological system, encompassing all life and its environments, and ecosystems are its fundamental working units.

 

Question 4. Who developed Material Balance Models?
(a) Thomas and Picardy
(b) Alenkneese and R.V.Ayres
(c) Joan Robinson and J.M.Keynes
(d) Joseph Stiglitz and Edward Chamberlin
Answer: (d) Joseph Stiglitz and Edward Chamberlin
In simple words: The Material Balance Model, which helps us understand how materials flow in an economy and interact with the environment, was created by Joseph Stiglitz and Edward Chamberlin. This model helps to track resources from extraction to waste.

🎯 Exam Tip: For questions about the originators of economic models, try to associate the names with the specific concept they developed.

 

Question 5. Environmental goods are ...............
(a) Market goods
(b) Non - market goods
(c) Both
(d) None of the options
Answer: (b) Non - market goods
In simple words: Environmental goods are things from nature, like clean air or beautiful forests, that we use but usually don't buy or sell in a market. Their value is often hard to measure in money.

🎯 Exam Tip: Understand that non-market goods are valuable but don't have a direct price tag, making them challenging for traditional economic models to incorporate.

 

Question 6. In a pure public good, consumption is ...............
(a) Rival
(b) Non - rival
(c) Both
(d) None of the options
Answer: (a) Rival
In simple words: When a good is 'rival' in consumption, it means that if one person uses it, another person cannot use the same unit of it. For example, if you eat an apple, no one else can eat that exact apple.

🎯 Exam Tip: Differentiate between rivalrous and non-rivalrous goods; a public good is typically non-rival, meaning one person's consumption does not reduce its availability to others.

 

Question 7. One of the most important market failures is caused by ...............
(a) Positive externalities
(b) Negative externalities
(c) Both
(d) None of the options
Answer: (b) Negative externalities
In simple words: Market failures happen when the free market doesn't provide goods or services efficiently. Negative externalities, like pollution from a factory that harms nearby residents, are a big reason for these failures because the cost isn't paid by the factory.

🎯 Exam Tip: Remember that externalities, especially negative ones, create a gap between private costs/benefits and social costs/benefits, leading to market inefficiency.

 

Question 8. The common source of outdoor air pollution is caused by combustion processes from the following ...............
(a) Heating and cooking
(b) Traditional stoves
(c) Motor vehicles
(d) All the options
Answer: (b) Traditional stoves
In simple words: Burning things, especially in old-fashioned stoves, releases a lot of harmful gases and particles into the air outside. These stoves are often used for heating and cooking in some areas.

🎯 Exam Tip: Focus on identifying the primary sources of pollution for specific types, as their impacts can vary greatly.

 

Question 9. The major contributor of Carbon monoxide is
(a) Automobiles
(b) Industrial process
(c) Stationary fuel combustion
(d) None of the options
Answer: (a) Automobiles
In simple words: Cars and other vehicles that run on fuel release a large amount of carbon monoxide into the air. This gas is harmful and comes from the engines burning fuel.

🎯 Exam Tip: Knowing the specific pollutants and their main sources is crucial for understanding air quality issues and their solutions.

 

Question 10. Which one of the following causes of global warming?
(a) Earth gravitation force
(b) Oxygen
(c) Centripetal force
(d) Increasing temperature
Answer: (d) Increasing temperature
In simple words: Global warming is mainly caused by the Earth's temperature going up over time due to more greenhouse gases trapping heat. This rise in temperature is a direct measure of global warming.

🎯 Exam Tip: Understand that global warming is defined by a sustained increase in Earth's average temperature, primarily due to human activities releasing greenhouse gases.

 

Question 11. Which of the following is responsible for protecting humans from harmful ultraviolet rays? .
(a) UV-A
(b) UV-C.
(c) Ozone layer
(d) None of the options
Answer: (c) Ozone layer
In simple words: High up in the Earth's atmosphere, there is a layer of ozone gas that acts like a shield. It absorbs most of the sun's dangerous ultraviolet rays, stopping them from reaching us on the ground.

🎯 Exam Tip: Focus on the ozone layer's role in absorbing harmful UV radiation and its importance for life on Earth.

 

Question 12. Global warming also refers to as
(a) Ecological change
(b) Climate Change
(c) Atmosphere changé
(d) None of the options
Answer: (d) None of the options
In simple words: Global warming specifically means the long-term heating of Earth's climate system observed since the pre-industrial period. While it leads to climate change, the terms are distinct, and none of the given options perfectly capture "global warming" as a direct synonym.

🎯 Exam Tip: While global warming contributes to climate change, they are not exact synonyms. Global warming refers specifically to the increase in Earth's average temperature.

 

Question 13. Which of the following is the anticipated effect of Global Warming?
(a) Rising sea levels
(b) Changing precipitation
(c) Expansion of deserts
(d) All of the options
Answer: (b) Changing precipitation
In simple words: One expected outcome of global warming is that rainfall and snowfall patterns will change. Some places might get more rain, while others might get less, leading to floods or droughts.

🎯 Exam Tip: Remember that global warming impacts weather patterns, leading to more extreme and unpredictable rainfall or drought events globally.

 

Question 14. The process of nutrient enrichment is termed as
(a) Eutrophication
(b) Limiting nutrients
(c) Enrichment
(d) Schistosomoasis
Answer: (b) Limiting nutrients
In simple words: In many environments, the growth of plants and other organisms is controlled by the availability of certain nutrients, meaning those nutrients "limit" how much growth can happen. When there are not enough nutrients, growth is limited.

🎯 Exam Tip: Understand the concept of limiting nutrients, where the scarcity of a specific nutrient restricts the growth of a population or ecosystem, even if other resources are plentiful.

 

Question 15. Primary cause of Soil pollution is ...............
(a) Pest control measures
(b) Land reclamation
(c) Agricultural run off
(d) Chemical fertilizer
Answer: (d) Chemical fertilizer
In simple words: When farmers use too much chemical fertilizer on their fields, these chemicals can build up in the soil and cause harm. This overuse is a main reason for soil becoming polluted.

🎯 Exam Tip: Identify chemical fertilizers as a significant contributor to soil pollution, as their overuse can introduce harmful substances into the soil ecosystem.

 

Question 16. Which of the following is main cause for deforestation?
(a) Timber harvesting industry
(b) Natural afforestation
(c) Soil stabilization
(d) Climate stabilization
Answer: (a) Timber harvesting industry
In simple words: A major reason why forests are cut down is because companies chop trees to get wood for products. This industry removes many trees, leading to deforestation.

🎯 Exam Tip: Recognize that commercial logging and the demand for timber products are primary drivers of deforestation globally.

 

Question 17. Electronic waste is commonly referred as ...............
(a) Solid waste
(b) Composite waste
(c) e- waste
(d) Hospital waste
Answer: (c) e- waste
In simple words: Old or broken electronic items like phones, computers, and televisions are called e-waste. This term is used for all kinds of discarded electronics.

🎯 Exam Tip: Use the specific term "e-waste" when referring to discarded electronic devices, as it highlights the unique challenges of their disposal and recycling.

 

Question 18. Acid rain is one of the consequences of Air pollution
(a) Water Pollution
(b) Land pollution
(c) Noise pollution
(d) Water Pollution
Answer: (a) Water Pollution
In simple words: Acid rain, which is caused by air pollution, can fall into lakes, rivers, and oceans. This makes the water acidic and harms aquatic life, leading to water pollution.

🎯 Exam Tip: While acid rain originates from air pollution, remember its significant impacts on water bodies, soil, and vegetation.

 

Question 19. Sustainable Development Goals and targets are to be achieved by ...............
(a) 2020
(b) 2025
(c) 2030
(d) 2050
Answer: (c) 2030
In simple words: The United Nations set a deadline of 2030 to achieve the Sustainable Development Goals (SDGs). These goals aim to solve big global problems by that year.

🎯 Exam Tip: Be aware of the timeframe for global initiatives like the SDGs, as it often indicates the urgency and scope of the efforts.

 

Question 20. Alkali soils are predominantly located in the ............... plains?
(a) Indus-Ganga
(b) North-Indian
(c) Gangetic plains
(d) All the options
Answer: (d) All the options
In simple words: Alkali soils, which have high salt content, are found mostly in the flat areas of the Indus-Ganga, North-Indian, and Gangetic plains. These regions share similar conditions that lead to such soil types.

🎯 Exam Tip: When a question asks about the location of a specific geographical feature, consider if it's spread across multiple related regions.

 

PART -B

Answer the following questions in one or two sentences.

 

Question 21. State the meaning of environment.
Answer: The environment includes all living and non-living things that surround us, affecting how we live and interact. Environmental economics is a branch that studies how economic activities value and impact these natural surroundings, aiming to balance both. It considers all the financial effects of environmental issues and policies. The goal is to sustainably manage resources for current and future generations.
In simple words: The environment is everything around us, both living and non-living. Environmental economics studies how our money decisions affect nature and how nature affects our money.

🎯 Exam Tip: When defining a concept like 'environment', it's good to include both its natural components and its connection to human activities and economic impact.

 

Question 22. What do you mean by ecosystem?
Answer: An ecosystem is a complex system where a group of living organisms, like plants and animals, interact with each other and with their non-living environment. It's a natural unit where all parts are connected. For example, a forest with its trees, animals, soil, and water is an ecosystem.
In simple words: An ecosystem is where living things and their non-living surroundings work together. It's a community of life interacting with its natural habitat.

🎯 Exam Tip: Remember that an ecosystem always involves both biotic (living) and abiotic (non-living) components interacting within a defined area.

 

Question 23. Mention the countries where per capita carbon dioxide emission is the highest in the world.
Answer: The countries with the highest per capita carbon dioxide emissions in the world often include those with high industrial activity and energy consumption. These nations tend to have larger carbon footprints per person. The major contributors mentioned are:

• United States of America – (USA)
• European Union – (EU)
• Japan
• Russian Federation
• United Arab Emirates (UAE)
• Saudi Arabia
• China

In simple words: Countries like the USA, EU nations, Japan, Russia, UAE, Saudi Arabia, and China have the highest amount of carbon dioxide released per person. This is often due to their industries and lifestyles.

🎯 Exam Tip: When listing countries for such questions, aim to include a mix of developed and rapidly industrializing nations if possible, as their emission drivers can differ.

 

Question 24. What are environmental goods? Give examples.
Answer: Environmental goods are resources provided by nature that are usually not bought or sold in typical markets. They offer benefits to people but do not have a direct price tag. These goods are crucial for our well-being and the health of the planet.
Eg: Rivers, Forests, Mountains
In simple words: Environmental goods are things from nature that are valuable to us but don't have a market price, like clean rivers, thick forests, and tall mountains.

🎯 Exam Tip: When asked for examples of environmental goods, think of natural resources that provide widespread public benefits but are not easily privatized or traded.

 

Question 25. What are the remedial measures to control noise pollution?
Answer: To control noise pollution, several measures can be adopted to reduce unwanted sounds in our environment. These steps focus on reducing sound at its source or blocking its spread. Effective control helps improve public health and quality of life.
1. Use of noise barriers
2. Newer roadway for surface transport
3. Traffic control
4. Regulating times for heavy vehicles
5. Installations of noise barriers in the workplace
6. Regulation of Loudspeakers
In simple words: We can control noise pollution by building sound walls, making quieter roads, managing traffic better, having rules for loud vehicles and loudspeakers, and putting up noise barriers in noisy workplaces.

🎯 Exam Tip: When listing remedial measures, try to categorize them (e.g., source control, pathway control) to ensure a comprehensive answer.

 

Question 26. Define Global warming.
Answer: Global warming refers to the ongoing increase in the average temperature of Earth's surface and its atmosphere. This phenomenon is primarily caused by the buildup of greenhouse gases, like carbon dioxide, which trap heat in the atmosphere. This trapping of heat makes our planet hotter over time.
In simple words: Global warming means our Earth is getting hotter because gases like carbon dioxide are building up and trapping heat in the air.

🎯 Exam Tip: For a definition of global warming, ensure you mention both the increase in temperature and the role of greenhouse gases as the cause.

 

Question 27. Specify the meaning of seed ball.
Answer: A seed ball, sometimes called a seed bomb, is a small ball made of seeds wrapped in materials like clay and compost, then dried. This method protects the seeds until the right time for them to grow. It's a simple way to plant seeds easily and help grow plants sustainably.
1. A seed ball (or seed bomb) is a seed that has been wrapped in soil materials, usually a mixture of clay and compost, and then dried.
2. Essentially, the seed is 'pre-planted' and can be sown by depositing the seed ball anywhere suitable for the species, keeping the seed safely until the proper germination window arises.
3. Seed balls are an easy and sustainable way to cultivate plants that provide a larger window of time when the sowing can occur.
In simple words: A seed ball is a small mix of seeds, soil, and compost, shaped into a ball and dried. You can throw it anywhere, and the seeds will stay safe inside until it's time for them to sprout.

🎯 Exam Tip: Highlight the protective nature of seed balls and their role in facilitating easier and more sustainable planting, especially in challenging environments.

 

PART -C

Answer the following questions in one paragraph

 

Question 28. Brief the linkage between economy and environment.
Answer: Human life is deeply connected to both living and non-living elements of the environment, influencing our social, political, and economic systems. Our well-being directly depends on the health of our surroundings. This close relationship between how we run our economy and its impact on the environment is often explained through a 'Material Balance Model.' This model shows how materials flow through the economy, from natural resources to waste, linking our economic activities directly to environmental consequences. Recognizing this connection helps us understand the importance of sustainable practices.
In simple words: Our lives and economy are linked to the environment. The way we produce and consume things affects nature, and a healthy environment is needed for our economy to thrive. This connection is shown in a model that tracks materials.

🎯 Exam Tip: When discussing the economy-environment link, emphasize the two-way relationship: how the economy uses and affects the environment, and how environmental quality impacts economic well-being.

 

Question 29. Specify the meaning of material balance principle.
Answer: The Material Balance Model, developed by Alenkneese and R.V.Ayres, helps explain the strong link between the economy and the environment. This model views the entire economic process as a physically balanced flow, meaning that everything that goes into the economy as an input, like raw materials, must eventually come out as an output, whether as goods or as waste. It follows the first law of thermodynamics, which states that matter cannot be created or destroyed, only changed. In simple terms, this means "what goes in must come out" of any production system, highlighting the circular nature of resource use and waste generation. This principle underscores the importance of managing both inputs and outputs to reduce environmental harm.
In simple words: The material balance principle means that everything we use in our economy, from raw materials to final products, eventually becomes waste or pollution. It's like a cycle where what goes in must come out, linking our economy directly to the environment.

🎯 Exam Tip: Focus on the "what goes in must come out" aspect of the material balance principle and its connection to the first law of thermodynamics, as this is the core idea.

 

Question 30. Explain different types of air pollution.
Answer: Air pollution can be categorized into two main types based on where it occurs. Both forms can have serious health and environmental impacts, making their understanding crucial for mitigation efforts.
Types of Air pollution:
1. Indoor Air Pollution: This type of pollution refers to harmful substances found in the air inside homes, schools, and workplaces. For example, cooking with solid fuels on open fires or using traditional stoves can lead to high levels of indoor air pollution, trapping dangerous fumes in enclosed spaces. Good ventilation is key to reducing this.
2. Outdoor Air Pollution: This involves pollutants present in the open air. The main sources of outdoor air pollution include gases and particles from vehicle exhaust, burning solid fuels in industries, and general industrial processes. These sources release contaminants into the wider atmosphere, affecting large populations and ecosystems.
In simple words: Air pollution happens both inside and outside. Indoor air pollution comes from things like cooking fumes inside buildings, while outdoor air pollution comes from cars and factories releasing smoke into the open air.

🎯 Exam Tip: Clearly differentiate between indoor and outdoor air pollution by giving distinct examples for each type and briefly mentioning their origins.

 

Question 31. What are the causes of water pollution?
Answer: Water pollution is caused by various factors that introduce harmful substances into water bodies, making them unsafe for use and harming aquatic life. Addressing these causes is essential for maintaining clean water resources. Every human activity can somehow contribute to water contamination if not managed well.
1. Discharge of sewage and wastewater.
2. Dumping of solid wastes.
3. Discharge of industrial wastes.
4. Oil spill
5. Acid rain
6. Global warming
7. Eutrophication
In simple words: Water pollution happens because of many things like dirty water from homes and factories, trash dumped in water, oil spills, and even acid rain. Global warming and too many nutrients (eutrophication) also harm water.

🎯 Exam Tip: When listing causes, group them by source (e.g., domestic, industrial, agricultural) to show a systematic understanding of the problem.

 

Question 32. State the meaning of e-waste.
Answer: E-waste, or electronic waste, refers to discarded electronic devices that have reached the end of their useful life. It's a growing problem in our modern, technology-driven society. This includes a wide range of old, unwanted, or broken electronics, from small gadgets to large appliances. E-waste is a physical form of waste from our information technology-focused world.
1. Electronic waste which is commonly referred as "e-waste” is the new byproduct of the Info-Tech society.
2. It is a physical waste in the form of old discarded, end of life electronics.
3. It includes a broad and growing range of electronic devices from large household appliances such as refrigerators, air conditioners, cellular phones, computers and other electronic goods".
4. Similarly, e-waste can be defined as the result when consumer, business and household devices are disposed or sent for re-cycling (example, television, computers, audio-equipments, VCR, DVD, telephone, Fax, Xerox machines, wireless devices, video games, other households electronic equipment).
In simple words: E-waste is all the old or broken electronic items we throw away, like computers, phones, and TVs. It's a big problem in our digital world because these items need to be properly recycled.

🎯 Exam Tip: Define e-waste by its nature (discarded electronics) and its origin (the Info-Tech society), and mention the range of devices it includes.

 

Question 33. What is land pollution? Mention the causes of land pollution.
Answer: Land pollution is defined as the harm caused to land by dumping waste, which changes the natural environment and makes it degraded. Any substance released or placed on the land that alters its natural state contributes to this type of pollution. It affects soil quality, biodiversity, and ecosystem health. Understanding the causes is the first step towards managing this problem.
Causes:

• Deforestation and Soil erosion
• Agricultural Activities
• Mining Activities
• Landfills
• Industrialization
• Construction activities
• Nuclear waste.

In simple words: Land pollution is when waste damages the land, changing it badly. This happens because of cutting down trees, farming, mining, landfills, factories, construction, and nuclear waste.

🎯 Exam Tip: When explaining land pollution, provide a clear definition and then give a comprehensive list of its various causes, including human activities and waste disposal.

 

Question 34. Write a note on a) Climate change and b) Acid rain Climate Change:
Answer:
(a) Climate Change: Climate change refers to long-term shifts in temperatures and weather patterns, often seen as seasonal changes over extended periods. These changes are mainly due to the increasing buildup of greenhouse gases in the atmosphere. Human activities since the industrial revolution have significantly increased carbon dioxide concentrations, leading to a warmer planet. This warming has already caused higher coastal water temperatures, altered rainfall, and more intense storms globally.
1. climate change refers to seasonal changes over a long period with respect to the growing accumulation of greenhouse gases in the atmosphere.
2. Recent studies have shown that human activities since the beginning of the industrial revolution, have contributed to an increase in the concentration of carbon dioxide in the atmosphere by as much as 40%, from about 280 parts per million in the pre-industrial period, to 402 parts per million in 2016, which in turn has led to global warming.
3. Several parts of the world have already experienced the warming of coastal waters, high temperatures, a marked change in rainfall patterns, and increased intensity and frequency of storms. Sea levels and temperatures are expected to be rising.
(b) Acid Rain: Acid rain is a consequence of air pollution, occurring when emissions from factories, cars, or heating systems mix with water in the atmosphere. These emissions contain harmful gases like nitrogen oxides, sulfur dioxide, and sulfur trioxide. When these gases combine with water, they form sulfurous acid, nitric acid, and sulfuric acid, which then fall to Earth as acid rain. This natural process can also occur through volcanic eruptions. Acid rain has damaging effects on plants, aquatic animals, and buildings.
1. Acid rain is one of the consequences of air pollution.
2. It occurs when emissions from factories, cars or heating boilers contact with the water in the atmosphere.
3. These emissions contain nitrogen oxides, sulphur dioxide and sulphur trioxide which when mixed with water become sulfurous acid, nitric acid and sulfuric acid.
4. This process also occurs by nature through volcanic eruptions.
5. It can have harmful effects on plants, aquatic animals and infrastructure.
In simple words: Climate change means long-term changes in weather, mostly because more greenhouse gases are trapping heat. Acid rain happens when pollution from factories and cars mixes with clouds, making the rain acidic, which harms plants and water.

🎯 Exam Tip: For each concept, define it clearly, explain its causes (especially human activities), and mention its significant impacts on the environment.

 

PART -D

Answer the following questions in about a page.

 

Question 35. Briefly explain the relationship between GDP growth and the quality of environment.
Answer: The relationship between GDP growth and environmental quality is complex and often shows a declining trend in environmental health as economies grow, especially in capitalist systems. Environmental quality encompasses the natural properties and characteristics that affect living beings. Pure public goods, like a clean environment, can be consumed by everyone without excluding anyone, but this also leads to the "free rider" problem, where individuals consume without contributing, causing resources to deplete. Currently, the contribution of natural resources to GDP and their depletion are not fully accounted for in national income calculations. Environmental economics highlights that market failures, often caused by negative externalities like pollution from production and consumption, significantly impact environmental quality. An externality is when an action imposes costs or benefits on a third party who is not involved in the transaction. Positive externalities, like beehives helping apple pollination, are beneficial, while negative ones, such as factory pollution, are harmful. These externalities often occur outside the market and are not included in GDP calculations. If we properly measure and include both positive and negative externalities, we can get a clearer picture of how GDP growth truly correlates with environmental quality, moving towards a more sustainable economic model.
In simple words: As countries grow their economies (GDP), the environment often gets worse because natural resources are used up and pollution increases. This happens because the cost of environmental harm is not usually included in the price of goods. If we could count these hidden environmental costs, we would see a clearer link between how much money a country makes and how healthy its environment is.

🎯 Exam Tip: When discussing GDP and environment, use terms like 'externalities' and 'market failure' to show a deeper economic understanding. Explain how current GDP metrics don't fully capture environmental costs.

 

Question 36. Explain the concepts of externality and its classification Externality:
Answer: Externalities are effects that happen outside of a direct transaction. They are external or spillover effects that arise from production or consumption activities and impact third parties who are not directly involved. These effects occur because economic units depend on each other.
In simple words: Externalities are when what one person or company does affects others who are not part of the deal. They can be good or bad.

🎯 Exam Tip: Remember to clearly define externalities and mention that they are 'spillover effects' impacting third parties to score full marks.

 

Positive Consumption Externality:
Answer: This happens when someone benefits from another person's consumption without paying for it. For instance, if some people in a neighborhood pay for a private security agency to patrol their area, other residents nearby also get better security without having to pay any cost themselves. This makes the whole neighborhood safer.
In simple words: When you get a benefit from something someone else buys or uses, but you don't have to pay for it.

🎯 Exam Tip: When explaining positive externalities, always provide a clear example like security services or vaccinations to illustrate the concept. This helps show the direct benefit to others.

 

Negative Consumption Externality:
Answer: This occurs when one person's consumption causes harm or dissatisfaction to others. For example, a person smoking a cigarette might enjoy it, but the smoke causes discomfort and health issues (dissatisfaction) for non-smokers nearby. This negative effect is passed on to others. Avoiding these effects is crucial for public health.
In simple words: When something one person enjoys doing causes problems or harm to other people nearby.

🎯 Exam Tip: For negative consumption externalities, pollution-related examples like smoking or loud music are very effective as they clearly show the harm to third parties.

 

Positive Production Externality:
Answer: This is when a company's production activity benefits others without a direct payment. For instance, beehives placed near orchards benefit both the beekeeper (who gets honey) and the apple producer (whose trees are pollinated by the bees). This kind of mutual benefit without a direct trade is called reciprocal untraded interdependency. Another example is when a company trains its workers, and those skilled workers later join other companies, providing a benefit to the new employers without them having to pay for the initial training. Promoting such positive spillovers can boost overall economic efficiency.
In simple words: When a company makes something, and in doing so, it also helps other companies or people for free.

🎯 Exam Tip: Highlight "reciprocal untraded interdependency" for the beehive example to show a deep understanding of positive production externalities.

 

Question 37. Explain the importance of sustainable development and its goals.
Answer: Sustainable development is a way of developing that meets the needs of people living today without harming the ability of future generations to meet their own needs. It is important to balance economic growth, social fairness, and environmental protection. The United Nations set 17 Sustainable Development Goals (SDGs) to be achieved by 2030, based on principles of universality, integration, and transformation. These goals cover many areas like ending poverty, ensuring good health, providing quality education, protecting the environment, and promoting peace. Working towards these goals helps create a better and more sustainable world for everyone.

Sustainable Development Goals (SDGs):
1. End Poverty in all its forms everywhere
2. End hunger, achieve food security and improved nutrition and promote sustainable agriculture
3. Ensure healthy lives and promote well-being for all at all ages
4. Ensure inclusive and quality education for all and promote lifelong learning
5. Achieve gender equality and empower women and girls
6. Ensure access to water and sanitation for all
7. Ensure access to affordable, reliable, sustainable, and modern energy for all.
8. Promote inclusive and sustainable economic growth, employment, and decent work for all.
9. Build resilient infrastructure, promote sustainable industrialization, and foster innovation.
10. Reduce inequality within and among countries
11. Make cities inclusive, safe, resilient, and sustainable
12. Ensure sustainable consumption and production pattern
13. Take urgent action to combat climate change and its impacts
14. Conserve and sustainably use the oceans, seas, and marine resources
15. Sustainably manage forests, combat desertification, halt and reverse land degradation, halt biodiversity loss
16. Promote just, peaceful and inclusive societies
17. Revitalize the global partnership for sustainable development.
In simple words: Sustainable development means using resources wisely so that people today can live well, and people in the future can also live well. There are 17 big goals set by the UN to help make this happen, like ending poverty and protecting the planet.

🎯 Exam Tip: When explaining sustainable development, always include the core definition and mention the three pillars: economic growth, social inclusion, and environmental protection. Listing a few key SDGs will also strengthen your answer.

 

I. Choose the best Answer

 

Question 1. "All the conditions, circumstances, and influences surrounding and affecting the development of an organism or group of organisms" is called ........................
(a) Environment
(b) Economics
(c) Eco system
(d) Biosphere
Answer: (a) Environment
In simple words: The "environment" includes everything around a living thing that helps it grow and live. It refers to all the conditions that surround and influence life.

🎯 Exam Tip: When defining "environment," focus on the key idea that it encompasses all external factors that influence living organisms.

 

Question 2. ........................ refers to external effects resulting from the act of production or consumption on the third parties.
(a) Externalities
(b) Ecosystems
(c) Pollution
(d) Environmental quality
Answer: (a) Externalities
In simple words: Externalities are effects on others when a product is made or used, but these effects are not part of the price. These are unintended side effects.

🎯 Exam Tip: Remember that externalities are specifically about effects on 'third parties' not involved in the original economic transaction. This is a crucial distinction.

 

Question 3. ........................ Economics involves theoretical and empirical studies of the economic effects.
(a) Biosphere
(b) Political
(c) Environment
(d) Philosophical
Answer: (c) Environment
In simple words: Environmental Economics studies how our economy and environment affect each other. It looks at the money side of environmental problems.

🎯 Exam Tip: Environmental economics often deals with how economic activities impact nature and how environmental policies affect the economy.

 

Question 4. ........................ is the introduction of contaminants into the natural environment.
(a) Externalities
(b) Pollution
(c) Ecosystem
(d) Spillover effects
Answer: (b) Pollution
In simple words: Pollution means putting harmful things into nature, which makes it dirty or unsafe. These contaminants change the environment negatively.

🎯 Exam Tip: The core of pollution is the introduction of 'contaminants' that harm the environment. This definition is essential.

 

Question 5. ........................ is the current increase in temperature of the Earth's surface as well as its atmosphere.
(a) Global warming
(b) Climate change
(c) Pollution
(d) None of the options
Answer: (a) Global warming
In simple words: Global warming means the Earth's average temperature is going up, making the planet hotter. This rise in temperature affects weather patterns globally.

🎯 Exam Tip: Differentiate global warming (temperature rise) from climate change (broader shifts in weather patterns) when describing this concept.

 

Question 6. Vehicles smoke happens to release high amounts of ........................
(a) Carbon - di - oxide
(b) Carbon - monoxide
(c) Carbon
(d) Oxygen
Answer: (b) Carbon - monoxide
In simple words: Cars and other vehicles release a lot of carbon monoxide, which is a harmful gas. This gas is colorless and odorless but very toxic.

🎯 Exam Tip: Remember that carbon monoxide is a particularly dangerous emission from vehicle exhaust due to its toxicity, even in small amounts.

 

Question 7. Negative Production externalities are caused by ........................
(a) Industries
(b) Agriculture
(c) Transport
(d) Computer
Answer: (a) Industries
In simple words: Many industries create pollution or other negative effects that harm people outside of their factory. These harmful side effects are called negative production externalities.

🎯 Exam Tip: Industries are a prime example of sources for negative production externalities due to pollution, waste, and resource depletion.

 

Question 8. ........................ is unwanted or excessive sound that can have deleterious effects on human health and environmental quality.
(a) Sound pollution
(b) Water pollution
(c) Noise pollution
(d) Land pollution
Answer: (c) Noise pollution
In simple words: Noise pollution is loud, unwanted sound that can harm people's health and the environment. It can come from many sources like traffic or factories.

🎯 Exam Tip: Emphasize that noise pollution is about 'unwanted or excessive sound' and its 'deleterious effects' on health and the environment.

 

Question 9. ........................ is unwanted or excessive sound that can have deleterious effects on human health and environmental quality.
(a) Air pollution
(b) Water pollution
(c) Noise pollution
(d) Land pollution
Answer: (c) Noise pollution
In simple words: Noise pollution means having too much loud or annoying sound around us, which can make us sick or hurt nature. It disrupts natural ecosystems.

🎯 Exam Tip: This question is a direct repeat of Question 8. Ensure you select the same correct answer to maintain consistency.

 

Question 10. ........................ is a system of agricultural production which avoids the use of synthetic fertilizer, pesticides, and livestock additives.
(a) Organic farming
(b) Green Revolution
(c) Sustainable Development
(d) Green Initiatives
Answer: (a) Organic farming
In simple words: Organic farming is a way to grow food without using man-made chemicals like pesticides or artificial fertilizers. It focuses on natural methods.

🎯 Exam Tip: Key phrases for organic farming are "avoids synthetic inputs" and "relies on natural processes."

 

Question 11. ........................ is an increased level of nutrients in water bodies.
(a) Eutrophication
(b) Global warming
(c) Acid rain
(d) Oil spill
Answer: (a) Eutrophication
In simple words: Eutrophication is when too many nutrients, like fertilizers, get into water, causing too much plant growth, especially algae. This can harm other life in the water.

🎯 Exam Tip: Connect eutrophication directly to 'excess nutrients' leading to 'algal blooms' and subsequent oxygen depletion in water bodies.

 

Question 12. ........................ is the supplier of all forms of resources like renewable and non-renewable.
(a) Environment
(b) Environmental goods
(c) Environmental quality
(d) Environmental wastes
Answer: (a) Environment
In simple words: The environment provides us with all resources, both those that can be replaced (like sunlight) and those that cannot (like oil). It is the source of all raw materials.

🎯 Exam Tip: Highlight the environment's role as the fundamental source of all resources, distinguishing it from 'environmental goods' which are specific benefits.

 

III. Choose the correct pair:

 

Question 1.
(a) Environmental Goods - Industries
(b) Environmental Quality - Properties and characteristics of the Environment
(c) The Air Prevention and Control of Pollution Act - 1985
(d) Acid Rain - Sound pollution
Answer: (b) Environmental Quality - Properties and characteristics of the Environment
In simple words: Environmental quality is about how good or healthy the environment is, looking at its features and conditions. It describes the state of nature around us.

🎯 Exam Tip: When evaluating correct pairs, look for direct and accurate definitions or associations. Environmental quality is inherently linked to the characteristics of the environment.

 

Question 2.
(a) Concentration of carbon dioxide in the pre-industrial - 380 ppm
(b) Concentration Co2 in 2016 - 400ppm
(c) Externalities - spillover effects
(d) Organic farming - Chemical Fertilizers
Answer: (c) Externalities - spillover effects
In simple words: Externalities are simply the side effects that spill over and affect others, either positively or negatively. They are the indirect results of economic actions.

🎯 Exam Tip: The term "spillover effects" is almost synonymous with "externalities," making this pair a strong match. Knowing synonyms helps in MCQs.

 

Question 3.
(a) Alkali soils - Indo - Gangetic plains
(b) E - wastes - Environmental wastes
(c) Ozone Layer - Infrared rays
(d) Non - conventional - Petrol
Answer: (a) Alkali soils - Indo - Gangetic plains
In simple words: Alkali soils, which have high salt content, are mostly found in the Indo-Gangetic plains region. This region has unique soil characteristics.

🎯 Exam Tip: Geographic distribution of soil types is a common knowledge point. Linking specific soil types to their typical regions is useful.

 

IV.Choose the incorrect pair:

 

Question 1.
(a) Environmental goods - Mountains, Rivers
(b) Ecosystem - the foundation of the Biosphere
(c) Spillover effects - Externalities
(d) Negative Production Externality - beehives
Answer: (d) Negative Production Externality - beehives
In simple words: Beehives near orchards actually create a positive effect (pollination) for others, not a negative one. Therefore, associating beehives with negative production externalities is incorrect.

🎯 Exam Tip: Always carefully analyze the relationship in each pair. Beehives are a classic example of a positive externality because they benefit crops through pollination.

 

Question 2.
(a) Non - conventional fuels - Biogas, CNG, LPG
(b) Eutrophication - the bloom of algae in the water
(c) Indoor air pollution - cooking with solid fuels on open fires
(d) Industrial wastes - Noise pollution
Answer: (d) Industrial wastes - Noise pollution
In simple words: Industrial wastes typically cause land or water pollution, not noise pollution directly. Noise pollution comes from loud sounds, not physical waste.

🎯 Exam Tip: Understand the specific types of pollution and their causes. Industrial waste causes solid or water pollution, while industrial machinery causes noise pollution.

 

II. Match the following:

 

Question 1.
A) Environia - 1) R. V Ayres
B) Material Balance Approach - 2) To surround
C) Non - conventional fuel - 3) Electronic wastes
D) E - waste - 4) Biogas
Answer: (c) 2 1 4 3
In simple words: Environia relates to "to surround," Material Balance Approach is linked to R.V. Ayres, Non-conventional fuel refers to Biogas, and E-waste is Electronic wastes. These pairs correctly link terms with their meanings or related concepts.

🎯 Exam Tip: For matching questions, break down each option and identify the direct or definitional connection to correctly form the pairs.

 

Question 2.
(a) Acid Rain - 1) Sound pollution
(b) Eutrophication - 2) Water pollution
(c) Oil spills - 3) Air pollution
(d) Hearing loss - 4) Depletion of oxygen on water
Answer: (c) 4 3 2 1
In simple words: Acid rain causes depletion of oxygen in water, Eutrophication leads to water pollution, oil spills are a type of air pollution (as they evaporate), and hearing loss is linked to sound pollution. Make sure to match each type of problem with its main effect or cause.

🎯 Exam Tip: Be careful with tricky pairs like "Oil spills" and "Air pollution"—while oil spills primarily affect water, their evaporation can contribute to air pollution. However, based on the options, the given answer structure implies a specific mapping.

 

Question 3.
(a) Production sector - 1) F = W2
(b) House hold sector - 2) R = W1+ W2
(c) Input = Output - 3) Final product
(d) F - 4) R = F + W₁
Answer: (b) 4 1 2 3
In simple words: Production sector is linked to \( R = F + W_1 \). Household sector is \( F = W_2 \). Input equals output is for final product, and \( R = W_1 + W_2 \) does not match with \( F \).

🎯 Exam Tip: This question tests specific economic formulas or relationships. Ensure you have memorized these specific equations for different sectors or concepts.

 

III. Choose the correct pair:

 

Question 1.
(a) Environmental Goods - Industries
(b) Environmental Quality - Properties and characteristics of the Environment
(c) The Air Prevention and Control of Pollution Act - 1985
(d) Acid Rain - Sound pollution
Answer: (b) Environmental Quality - Properties and characteristics of the Environment
In simple words: Environmental quality is about the features and conditions of the environment that affect living things. It describes the state and health of our surroundings.

🎯 Exam Tip: Re-emphasizing that environmental quality means understanding the key features and conditions of our natural surroundings is crucial. This helps confirm understanding, even if the question is repeated.

 

Question 2.
(a) Concentration of carbon dioxide in the pre-industrial - 380 ppm
(b) Concentration CO2 in 2016 - 400ppm
(c) Externalities - spillover effects
(d) Organic farming - Chemical Fertilizers
Answer: (c) Externalities - spillover effects
In simple words: Externalities are simply side effects that impact others without being part of the direct transaction. This effect "spills over" to them.

🎯 Exam Tip: The term "spillover effects" is a precise way to describe externalities. Always use this specific terminology when defining or explaining the concept.

 

Question 3.
(a) Alkali soils - Indo - Gangetic plains
(b) E - wastes - Environmental wastes
(c) Ozone Layer - Infrared rays
(d) Non - conventional - Petrol
Answer: (a) Alkali soils - Indo - Gangetic plains
In simple words: Alkali soils, which contain a lot of salt, are commonly found in the Indo-Gangetic plains area. This is a key geographic fact.

🎯 Exam Tip: For questions about geographical distribution, specific regions like the Indo-Gangetic plains are often associated with particular environmental characteristics or challenges.

 

IV.Choose the incorrect pair:

 

Question 1.
(a) Environmental goods - Mountains, Rivers
(b) Ecosystem - the foundation of the Biosphere
(c) Spillover effects - Externalities
(d) Negative Production Externality - beehives
Answer: (d) Negative Production Externality - beehives
In simple words: Beehives are known to help plants grow by spreading pollen, which is a good thing (a positive effect), not a harmful one. So, linking beehives to negative production effects is wrong.

🎯 Exam Tip: Clearly understanding positive vs. negative externalities is key. Beehives offer a clear 'positive' example through pollination benefits.

 

Question 2.
(a) Concentration of carbon dioxide in the pre-industrial - 38Oppm
(b) Concentration CO2 in 2016 - 400ppm
(c) Externalities - spillover effects
(d) Organic farming - Chemical Fertilizers
Answer: (c) Externalities - spillover effects
In simple words: Externalities are the same as spillover effects, so this is a correct match. The question asks for the incorrect pair, making this option correct in its pairing, not incorrect.

🎯 Exam Tip: Always double-check if the question asks for the 'correct' or 'incorrect' pair. Externalities and spillover effects are indeed the same concept.

 

Question 3.
(a) Alkali soils - Indo - Gangetic plains
(b) E - wastes - Environmental wastes
(c) Ozone Layer - Infrared rays
(d) Non - conventional - Petrol
Answer: (a) Alkali soils - Indo - Gangetic plains
In simple words: Alkali soils are indeed found mainly in the Indo-Gangetic plains, making this a correct pair. The question asks for the incorrect pair, so this option is correct in its pairing.

🎯 Exam Tip: Ensure you are answering the specific instruction "Choose the incorrect pair". If the pair itself is correct, it's not the answer to an "incorrect pair" question.

 

IV.Choose the incorrect pair:

 

Question 1.
(a) Environmental goods - Mountains, Rivers
(b) Ecosystem - the foundation of the Biosphere
(c) Spillover effects - Externalities
(d) Negative Production Externality - beehives.
Answer: (d) Negative Production Externality - beehives.
In simple words: Beehives provide a positive benefit (pollination) to crops, so they are a positive externality, not a negative one. This pairing is therefore incorrect.

🎯 Exam Tip: Recognize that a "negative" externality implies a harmful side effect, whereas beehives offer a beneficial "positive" effect to the surrounding environment.

 

Question 2.
(a) Non - conventional fuels - Biogas, CNG, LPG
(b) Eutrophication - the bloom of algae in the water
(c) Indoor air pollution - cooking with solid fuels on open fires
(d) Industrial wastes - Noise pollution.
Answer: (d) Industrial wastes - Noise pollution
In simple words: Industrial waste mainly causes land or water pollution, not sound pollution. Noise pollution comes from loud machines or activities, not from physical waste products.

🎯 Exam Tip: Differentiate between the different types of pollution and their primary sources. Industrial wastes are distinct from industrial noise as pollution sources.

 

Question 3.
(a) Oil spills - Seawater gets polluted
(b) Trees - CO2 emission
(c) Sustainable Development - economic growth, social inclusion, and environmental protection.
(d) Organic farming - crop rotation
Answer: (b) Trees - CO2 emission
In simple words: Trees absorb carbon dioxide, they don't emit it. So, stating that trees cause CO2 emissions is an incorrect statement. Trees help reduce CO2.

🎯 Exam Tip: Remember the basic role of trees in photosynthesis, which involves absorbing CO2. This makes the pairing of "Trees - CO2 emission" fundamentally incorrect.

 

V. Choose the correct Statement:

 

Question 1.
(a) Average temperatures around the world have risen by 1°c over the last 100 years.
(b) Global warming reduces the level of greenhouse gases.
(c) Vehicles smoke happens to release high amounts of carbon monoxide.
(d) Trees absorb oxygen from the air and release carbon dioxide.
Answer: (c) Vehicles smoke happens to release high amounts of carbon monoxide.
In simple words: Car exhaust fumes contain a lot of carbon monoxide, which is a poisonous gas. This is a major source of air pollution.

🎯 Exam Tip: Be precise with scientific facts. Vehicles release carbon monoxide, and trees absorb carbon dioxide while releasing oxygen, not the other way around.

 

Question 2.
(a) Water pollution increases the oxygen level in the water
(b) Pollution is the introduction of contaminants into the natural environment.
(c) Beneficial externalities are called "positive externalities”.
(d) Environment is a private good.
Answer: (b) Pollution is the introduction of contaminants into the natural environment.
In simple words: Pollution is when harmful things are added to nature, making it dirty or unhealthy. This is the basic definition of pollution.

🎯 Exam Tip: Recognize the most accurate and encompassing definition provided. The definition of pollution as "introduction of contaminants" is fundamental.

 

Question 3.
(a) Environmental goods are typically non - market goods.
(b) Positive production externalities include pollution generated by a factory that imposes costs on others.
(c) The term environment has been derived from the Greek word “Environia” which means to surround.
(d) The relationship between the economy and pollution is explained in the form of a "Material Balance Models".
Answer: (a) Environmental goods are typically non-market goods.
In simple words: Things from nature that we value, like clean air, are usually not bought or sold in markets. These are called non-market goods.

🎯 Exam Tip: Distinguish between market and non-market goods. Environmental goods often lack a clear market price, making them non-market goods.

VI. Choose the Incorrect Statement

 

Question 1. If we choose the incorrect statement, which of the following is it?
(a) Acid rain is one of the consequences of Air pollution.
(b) Sustainable Development includes economic growth, social inclusion, and environmental protection.
(c) Trees release oxygen and pollutes the air.
(d) Chronic exposure to noise may cause noise-induced hearing loss.
Answer: (c) Trees release oxygen and pollutes the air
In simple words: Trees actually produce oxygen and help clean the air, they do not pollute it. This makes option (c) the incorrect statement.

🎯 Exam Tip: When a question asks for the "incorrect" statement, carefully read all options and identify the one that is factually wrong or goes against established principles.

 

Question 2. Which of the following statements about global warming and ozone is incorrect?
(a) Increasing temperature in the atmosphere leads to global warming.
(b) Ozone layer is responsible for protecting humans from harmful ultraviolet rays.
(c) Earth's ozone layer is depleting due to the presence of chlorofluorocarbons and hydrochlorofluorocarbons in the atmosphere.
(d) Atmospheric pollution increases the level of ozone.
Answer: (d) Atmospheric pollution increases the level of ozone.
In simple words: Atmospheric pollution actually makes the ozone layer thinner, not thicker. So, more pollution means less ozone, which is bad for us.

🎯 Exam Tip: Understand the cause-and-effect relationships for environmental issues like global warming and ozone depletion to identify correct and incorrect statements easily.

 

Question 3. Which of the following statements is incorrect?
(a) Surface water includes natural water found on the earth's surface, like rivers, lakes, lagoons, and oceans.
(b) Eutrophication is an increased level of oxygen in water bodies.
(c) CO2 is the most important of the greenhouse gases contributing to 50% of global warming.
(d) 'Problem soils' exist mainly in arid and semi-arid regions.
Answer: (b) Eutrophication is an increased level of oxygen in water bodies.
In simple words: Eutrophication actually means there is *less* oxygen in water bodies, not more. This happens because too many nutrients cause algae to grow, which then die and get broken down by bacteria that use up the oxygen.

🎯 Exam Tip: Pay close attention to definitions of key environmental terms, especially those that involve levels (like "increased" or "decreased"), as they can be easily confused.

VII. Pick the Odd One Out:

 

Question 1. Choose the odd one out among the following types of pollution:
(a) Sea pollution
(b) Air pollution
(c) Land pollution
(d) Water pollution
Answer: (a) Sea pollution
In simple words: "Sea pollution" is a type of "water pollution," so it's a more specific category within the broader "water pollution." The other options are main categories of environmental pollution.

🎯 Exam Tip: When picking the odd one out, look for items that are either conceptually different, a sub-category of another option, or don't fit the general pattern of the rest.

 

Question 2. Pick the odd one out from the following energy sources:
(a) BIOGAS
(b) Petrol
(c) CNG
(d) LPG
Answer: (b) Petrol
In simple words: Biogas, CNG (Compressed Natural Gas), and LPG (Liquefied Petroleum Gas) are often considered alternative or non-conventional fuels that can be used to reduce reliance on traditional fossil fuels. Petrol is a conventional fossil fuel.

🎯 Exam Tip: Classify items into groups (e.g., conventional vs. non-conventional, renewable vs. non-renewable) to easily identify the outlier in "odd one out" questions.

VIII. Analyze the Reason:

 

Question 1. Analyze the Assertion and Reason:
Assertion (A): “E-waste" is the new by-product of the Info-Tech society.
Reason (R): E-waste can be generated as the result when consumer, business, and household devices are disposed or sent for recycling.
Answer: (a) Assertion (A) and (R) both are true, and (R) is the correct explanation of (A).
In simple words: The first statement says e-waste is a new problem from our digital world, which is true. The second statement explains *how* e-waste is created (from old electronics), which correctly explains the first statement.

🎯 Exam Tip: For Assertion-Reason questions, first check if both statements are individually true. Then, check if the Reason logically explains the Assertion. If so, option (a) is usually correct.

 

Question 2. Analyze the Assertion and Reason:
Assertion (A): Solid waste is basically the discharge of useless and unwarranted materials as a result of human activity.
Reason (R): Solid waste consists of the discards of households, hospital refuse, dead animals, debris from a construction site, etc.,
Answer: (b) Assertion (A) and Reason (R) both are true, but (R) is not the correct explanation of (A).
In simple words: Both statements are true: solid waste is indeed unwanted material from human activities, and the examples given are types of solid waste. However, the examples just list what solid waste is, they don't explain *why* it's "useless and unwarranted."

🎯 Exam Tip: If the Reason provides examples or characteristics rather than a cause or explanation for the Assertion, it's likely that both are true but the Reason isn't the *correct explanation*.

 

Question 3. Analyze the Assertion and Reason:
Assertion (A): Global warming is the current increase in temperature of the Earth's surface as well as its atmosphere.
Reason (R): The increase in the number of greenhouse gases warms the earth's surface.
(a) Assertion (A) and (R) both are true, and (R) is the correct explanation of (A).
(b) Assertion (A) and Reason (R) both are true, but (R) is not the correct explanation of (A).
(c) (A) is true but (R) is false.
(d) Both (A) and (R) are false.
Answer: (a) Assertion (A) and (R) both are true, and (R) is the correct explanation of (A).
In simple words: The assertion states that global warming is the rise in Earth's temperature, which is true. The reason explains that this temperature rise is due to more greenhouse gases, which is also true and directly explains the assertion.

🎯 Exam Tip: Look for a direct causal link between the Reason and the Assertion. If the Reason answers "why" the Assertion is true, it's likely the correct explanation.

IX. 2 Marks Questions

 

Question 1. Define "Solid wastes"?
Answer: Solid wastes are materials that are not liquid or easily dissolved. They range from everyday garbage to harmful industrial waste. These wastes often contain complex and dangerous substances. They can include things like sewage sludge, farm waste, broken building parts, and leftovers from mining.
In simple words: Solid wastes are unwanted, non-liquid materials that people throw away, including household trash and industrial waste, which can be harmful.

🎯 Exam Tip: For definitions, provide a clear, concise statement and then expand with a few illustrative examples to show full understanding.

 

Question 2. Draw the flow diagram for Material Balance Approach.
Answer: The flow diagram for the Material Balance Approach illustrates how raw materials flow through an economy, leading to goods, consumption, and ultimately, recycled materials or discharged waste back into the environment. It shows a continuous cycle of inputs and outputs.
In simple words: This diagram shows how raw materials are used to make goods. These goods are then used by people, who either recycle parts of them or throw them away as waste. This waste then goes back into nature.

🎯 Exam Tip: When drawing diagrams, ensure all key components are clearly labeled and arrows accurately show the direction of flow or relationship between elements.

 

Question 3. Define "Sustainable Development"?
Answer: Sustainable Development means improving things today in a way that does not harm the ability of future generations to meet their own needs. It is about balancing what we need now with what people will need later. Another way to think about it is focusing on natural resources and making sure they don't decrease over time. This approach ensures that we use our planet's assets wisely for a long time.
In simple words: Sustainable development means meeting our own needs today without stopping future generations from meeting their needs.

🎯 Exam Tip: Include the core idea of intergenerational equity (meeting present needs without compromising future needs) when defining sustainable development.

 

Question 4. What is pollution?
Answer: Pollution happens when harmful substances are introduced into our natural environment. These substances cause bad changes to living things, make things toxic, damage the environment, and spoil the beauty of our surroundings. It makes the air, water, and land unhealthy for everyone.
In simple words: Pollution is when harmful things enter the environment and cause damage to living things and nature.

🎯 Exam Tip: A good definition of pollution should include the introduction of contaminants, the natural environment, and the adverse effects caused.

 

Question 5. Define "Deforestation"?
Answer: Deforestation is the cutting down of forests. This is a big problem because people rely on trees for many things in life. Trees also help by absorbing carbon dioxide and releasing oxygen, which we all need to breathe. Forests are important for keeping soil healthy and preventing nutrients from being washed away. Cutting down too many trees often leads to land pollution and other environmental problems.
In simple words: Deforestation is when forests are cut down, which harms nature because trees are vital for oxygen, healthy soil, and preventing pollution.

🎯 Exam Tip: When defining deforestation, clearly state what it is and briefly mention at least two major reasons why it is harmful to the environment.

 

Question 6. What are the causes of Air pollution?
Answer: Air pollution is caused by several factors:

• Smoke from vehicles: Cars, buses, and trucks release harmful gases.
• Power plants using fossil fuels: Burning coal, oil, and gas for energy creates pollution.
• Smoke from factories: Industrial plants let out harmful fumes.
• Construction and farming: Building sites and agricultural activities can release dust and chemicals.
• Natural events: Things like volcanic eruptions and forest fires cause natural air pollution.
• Household activities: Cooking, heating, and using chemicals at home can release pollutants indoors.

These different sources all add to the unhealthy air we breathe.
In simple words: Air pollution comes from cars, factories, power plants, construction, farms, natural events like fires, and even everyday activities at home.

🎯 Exam Tip: Categorize the causes (e.g., transport, industry, natural, domestic) to ensure a comprehensive answer and easy recall.

 

Question 7. What are the effects of Air pollution?
Answer: Air pollution has many harmful effects on living things and the environment:

• Respiratory and heart problems: It makes people sick with breathing and heart issues.
• Acid rain: Pollutants mix with rain, damaging buildings and plants.
• Eutrophication: Air pollution can lead to too many nutrients in water, harming aquatic life.
• Effect on wildlife: Animals can get sick or lose their homes.
• Depletion of the ozone layer: Harmful chemicals thin the ozone, reducing protection from UV rays.
• Human Health: It can cause various illnesses and reduce overall well-being.
• Global warming: Pollutants trap heat, making the planet warmer.

These effects show how air pollution impacts our health and the entire ecosystem.
In simple words: Air pollution causes breathing and heart issues, leads to acid rain, harms wildlife, thins the ozone layer, negatively impacts human health, and contributes to global warming.

🎯 Exam Tip: When listing effects, try to include a mix of impacts on human health, the environment (like acid rain, ozone), and ecosystems (wildlife, global warming).

 

Question 8. What are the remedial measures to control Air pollution?
Answer: To control air pollution, we can take several steps:

• Establish industries away from towns: Factories should be located far from residential areas to reduce direct impact.
• Increase chimney height in industries: Taller chimneys help disperse pollutants higher up, reducing immediate ground-level concentration.
• Grow more plants and trees: Plants absorb carbon dioxide and release oxygen, cleaning the air.
• Use non-conventional fuels: Switching to fuels like Biogas, CNG, and LPG reduces harmful emissions.
• Use mass transit systems: Encouraging public transport reduces the number of individual vehicles on the road, lowering overall emissions.

These measures help make our air cleaner and healthier.
In simple words: We can control air pollution by moving factories away from cities, using taller chimneys, planting more trees, switching to cleaner fuels, and using public transport more often.

🎯 Exam Tip: Focus on practical, actionable steps for remedial measures. Think about solutions at individual, industrial, and governmental levels.

 

Question 9. What are the types of water pollution?
Answer: There are several types of water pollution that harm our water sources:

• Surface water pollution: This affects water bodies like rivers, lakes, and oceans.
• Groundwater pollution: This occurs when pollutants seep into underground water sources.
• Microbiological pollution: This is caused by harmful microorganisms like bacteria and viruses.
• Oxygen depletion pollution: This happens when there is not enough oxygen in the water for aquatic life to survive.

Understanding these types helps us address the specific problems in different water environments.
In simple words: Water pollution can be found in surface water, groundwater, caused by tiny living things, or when there isn't enough oxygen in the water.

🎯 Exam Tip: When listing types of pollution, provide clear, distinct categories that cover different forms and sources of contamination.

 

Question 10. What are the remedial measures to control water pollution?
Answer: To control water pollution, we can implement several key measures:

• Comprehensive water management plan: This involves an overall strategy for managing water resources.
• Construction of proper storm drains and settling ponds: These systems help manage rainwater runoff and allow pollutants to settle before water enters natural bodies.
• Maintenance of drain life: Regular cleaning and upkeep of drainage systems prevent blockages and overflows.
• Effluent and sewage treatment plant: Treating wastewater before it's released helps remove harmful substances.
• Regular monitoring of water and wastewater: Checking water quality frequently helps detect pollution early.
• Stringent actions towards illegal dumping: Strict laws and enforcement against illegal waste disposal in water bodies are essential.

These steps are crucial for keeping our water clean and safe.
In simple words: To control water pollution, we need good water plans, proper drains, wastewater treatment, regular checks on water quality, and strict rules against illegal dumping.

🎯 Exam Tip: Focus on a mix of preventive, treatment, and enforcement measures when discussing ways to control environmental pollution.

 

Question 11. Define Noise Pollution.
Answer: Noise pollution is any unwanted or very loud sound that harms human health and the quality of our environment. This kind of pollution often comes from factories, loud machines, and traffic from highways, railways, and airplanes. It also includes noise from construction work happening outdoors. Too much noise can be very disturbing and cause health problems.
In simple words: Noise pollution is loud, unwanted sound that can harm people and the environment, often coming from machines, traffic, and construction.

🎯 Exam Tip: A good definition of noise pollution should include both the nature of the sound (unwanted/excessive) and its harmful effects on health and environment.

 

Question 12. Name the types of Noise Pollution.
Answer: There are primarily three types of noise pollution:

• Atmospheric Noise: This refers to natural sounds like thunder or static caused by lightning.
• Industrial Noise: This is the noise generated by factories, machines, and manufacturing processes.
• Man-made Noise: This includes sounds from human activities like traffic (cars, trains, planes), construction, and music.

These categories help us understand the different sources of unwanted sound.
In simple words: The types of noise pollution are natural atmospheric noise, industrial noise from factories, and man-made noise from things like traffic and construction.

🎯 Exam Tip: When listing types, try to provide a brief distinguishing characteristic for each, as done here, to show a deeper understanding.

 

Question 13. What are the causes of Noise Pollution?
Answer: Noise pollution is caused by various factors:

• Poor urban planning: Cities that are not well-designed can lead to more noise.
• Sounds from motor vehicles: Cars, trucks, and other vehicles create a lot of noise.
• Crackers: Fireworks and firecrackers are a major source of sudden, loud noise.
• Factory machinery: Machines in factories can be very noisy.

These sources combine to create high levels of unwanted sound in our environment.
In simple words: Noise pollution is caused by bad city planning, vehicle sounds, crackers, and loud machines in factories.

🎯 Exam Tip: Provide a variety of causes covering different aspects of modern life (urban, industrial, transport, recreational) to demonstrate comprehensive knowledge.

 

Question 14. What are the effects of Noise Pollution?
Answer: Noise pollution has several negative effects:

• Hearing Loss: Long-term exposure to loud noise can damage hearing.
• Damage to physiological and psychological health: It can cause stress, anxiety, and other mental and physical health issues.
• Cardiovascular effects: Noise can contribute to high blood pressure and heart problems.
• Detrimental effect on animals and aquatic life: Loud sounds disrupt animal behavior and can harm marine life.
• Effects on wildlife and aquatic animals: It can interfere with their communication, migration, and reproduction.

These effects highlight the serious impact of noise on living beings and ecosystems.
In simple words: Noise pollution can cause hearing loss, stress, heart problems, and harm both land and water animals.

🎯 Exam Tip: When listing effects, group similar impacts (e.g., human health, animal health) to provide a structured and clear answer.

X. 3 Mark Questions

 

Question 1. Explain the types of Noise pollution?
Answer: There are three main types of noise pollution:
(I) Atmospheric Noise: This type of noise is natural, like the static sounds caused by lightning strikes in thunderstorms or other electrical events in the atmosphere. It is not caused by human activity.
(II) Industrial Noise: This noise comes from factories and industrial processes. When sound from machines becomes too loud and unwanted, it turns into noise pollution. Many heavy industries, such as shipbuilding and steel production, are known to cause noise-induced hearing loss (NIHL) among workers due to constant exposure.
(III) Man-made Noise: This includes sounds created by human activities. Key sources are transportation, like ships, aircraft, and motorboats. Other sources include construction work, drilling, and seismic exploration, which all contribute to high levels of noise pollution.
In simple words: Noise pollution can be natural, like thunder; industrial, from factories; or man-made, from things like traffic, construction, and airplanes.

🎯 Exam Tip: Clearly define and give examples for each type of noise pollution, explaining its source and primary characteristics.

 

Question 2. State the Effect of Land Pollution.
Answer: Land pollution has several serious effects:

• Soil pollution: It makes the soil unhealthy, affecting plant growth and food quality.
• Harmful effects on health: Polluted land can cause various illnesses in humans and animals.
• Cause for Air pollution: Dust and harmful gases from land pollution can spread into the air.
• Effect on wildlife: It damages natural habitats, making it hard for animals to live and survive.

These impacts highlight the importance of proper waste management and land conservation.
In simple words: Land pollution harms soil, causes health problems, can lead to air pollution, and negatively affects animals and their homes.

🎯 Exam Tip: When listing effects, ensure a mix of direct impacts (e.g., soil degradation) and indirect or broader impacts (e.g., health, effects on other types of pollution).

 

Question 3. State the remedial measures to control Land Pollution.
Answer: To control land pollution, several measures can be taken:

• Promote awareness about Reduce, Reuse, Recycle: Educating people helps them minimize waste.
• Buy biodegradable products: Choosing items that can break down naturally reduces lasting waste.
• Minimize pesticide usage: Reducing chemical use in farming prevents soil contamination.
• Encourage shifting cultivation responsibly: This practice helps maintain soil health if done sustainably.
• Properly dispose of garbage: Waste should be burned (where allowed) or buried in designated areas, not left indiscriminately.
• Minimize plastic usage: Reducing plastic consumption helps decrease non-biodegradable waste.

These steps help keep our land clean and healthy for future use.
In simple words: We can control land pollution by making people aware of recycling, buying eco-friendly products, using fewer pesticides, and properly getting rid of garbage and plastics.

🎯 Exam Tip: Focus on practical actions that individuals, communities, and industries can take to prevent and reduce land pollution.

 

Question 4. Define sustainable development.
Answer: Sustainable development is a way of developing that meets the needs of people living today without preventing future generations from meeting their own needs. It is a concept highlighted by the World Commission on Environment and Development in 1987. It means ensuring that our current actions do not deplete resources or damage the environment for those who will come after us. It also suggests focusing on natural resources and ensuring they do not decrease over time, emphasizing long-term ecological balance.
In simple words: Sustainable development means improving life now without harming the ability of future generations to live well.

🎯 Exam Tip: Always include the core idea of meeting present needs without compromising future generations' ability to meet their needs when defining sustainable development.

 

Question 5. What is alkali soil?
Answer: Alkali soil is a type of 'problem soil' where too much salt or acid builds up in the root zone of plants. This excessive accumulation of salt or acid causes the soil to lose some or all of its ability to grow crops well. These soils are most commonly found in dry and semi-dry regions of the world, where evaporation rates are high, leaving salts behind. Such soils become unproductive and challenging for agriculture.
In simple words: Alkali soil is soil with too much salt or acid in it, which makes it hard for plants to grow. It is often found in dry areas.

🎯 Exam Tip: When defining specific soil types, include both the chemical characteristic (e.g., excess salt/acid) and the impact on productivity, along with typical geographical location.

 

Question 6. What is Acid - rain?
Answer: Acid rain is a type of air pollution. It happens when harmful gases released from factories, cars, and heating systems mix with rainwater. These gases include nitrogen oxides, sulfur dioxide, and sulfur trioxide. When these chemicals combine with water in the atmosphere, they form strong acids like sulfurous acid, nitric acid, and sulfuric acid, which then fall to Earth as acid rain. This rain can damage plants, buildings, and water bodies.
In simple words: Acid rain happens when pollution from factories and cars mixes with rainwater, making the rain acidic and harmful to the environment.

🎯 Exam Tip: Explain both the source of the pollutants (factories, vehicles) and the chemical process (mixing with water to form acids) in your definition of acid rain.

 

Question 7. What is organic farming?
Answer: Organic farming is a way of growing food that relies on natural methods instead of artificial chemicals. It uses things like animal manure, compost made from organic waste, and crop rotation to keep the soil healthy. It also uses natural ways to control pests, such as planting certain legumes. This type of farming specifically avoids using man-made fertilizers, pesticides, and growth additives. Using natural inputs helps to improve the soil, making it richer for tiny living things (microbes) that help plants grow.
In simple words: Organic farming is a natural way of growing crops using things like manure and crop rotation, without artificial fertilizers or pesticides.

🎯 Exam Tip: When describing organic farming, emphasize its reliance on natural inputs and processes, and the explicit avoidance of synthetic chemicals.

XI. 5 Mark Questions

 

Question 1. Name the sources of E-waste.
Answer: E-waste, or electronic waste, comes from many different places. Here are the common sources classified by sector:

In simple words: E-waste comes from old electronics used in homes (like TVs and radios), hospitals (like ECG machines), government offices (like fax machines and computers), and businesses (like scanners and mixers).

🎯 Exam Tip: When listing sources for a complex topic like e-waste, categorize them (e.g., by sector) to make the answer clear and organized.

 

Question 2. Write a note on solid waste.
Answer: Solid waste refers to the unwanted and unusable materials that result from human activities. These wastes are mostly solid or semi-solid, but can also include liquids. They come from many sources, such as household garbage, hospital refuse, dead animals, construction debris, ashes, farm wastes, and industrial waste. If solid waste is not removed from public places, it can lead to serious health and hygiene problems. This highlights the importance of proper waste management for community health.
In simple words: Solid waste is unwanted material from human activities like household trash, hospital waste, or construction debris. If not managed properly, it can cause health issues.

🎯 Exam Tip: When writing a note, start with a clear definition, provide various examples of what it includes, and briefly mention its consequences if not properly handled.

 

Question 3. Explain the causes of Air pollution?
Answer: Air pollution is caused by many factors, broadly categorized as follows:
(I) Vehicle exhaust smoke: Cars, trucks, and other vehicles release a lot of carbon monoxide and other harmful gases. Millions of vehicles operate daily, each adding to the environmental footprint through its exhaust.
(II) Fossil fuel-based power plants: Burning fossil fuels like coal for energy in power plants is a major source of pollution. This process releases chemicals such as sulfur dioxide, which travels into the atmosphere. These pollutants then react with water molecules to form acid rain.
(III) Exhaust from Industrial Plants and Factories: Heavy machinery in large factories and industrial plants also releases significant amounts of pollutants into the air.
(IV) Construction and Agricultural activities: Construction sites produce dust particles and gaseous emissions. Similarly, agriculture, especially using ammonia, creates byproducts that can be dangerous gases affecting air quality.
(V) Natural Causes: Nature itself contributes to air pollution through events like volcanic eruptions, forest fires, and dust storms. These are natural occurrences that release large amounts of pollutants into the atmosphere.
(VI) Household activities: Everyday activities at home also contribute to air pollution. Cooking, heating, lighting, using mosquito repellents, pesticides, cleaning chemicals, and artificial fragrances all release various forms of pollutants. These sources, though smaller individually, collectively add to the overall air pollution.
In simple words: Air pollution comes from vehicles, burning fossil fuels in power plants, industrial factories, construction and farming activities, natural events like volcanoes, and even our daily household routines.

🎯 Exam Tip: When explaining causes with multiple sub-parts, use clear headings or bullet points for each category. Provide specific examples or effects for each cause.

 

Question 4. What are the general principles of organic farming?
Answer: Organic farming follows several important principles to ensure sustainable and healthy agriculture:

• Environmental Protection: It aims to protect the environment, reduce soil degradation and erosion, decrease pollution, improve biological productivity, and promote good health for all.
• Maintain Soil Fertility: Organic farming focuses on keeping the soil healthy for the long term by creating optimal conditions for biological activity within the soil.
• Biological Diversity: It supports maintaining a wide variety of life forms within the farming system, from microorganisms to beneficial insects.
• Resource Recycling: Materials and resources are recycled as much as possible within the farm, minimizing waste.
• Animal Welfare: Organic farming ensures that livestock receive attentive care that promotes their health and meets their natural behavioral needs.
• Organic Product Preparation: Organic products are prepared carefully, using handling methods that maintain their integrity and vital qualities throughout production.
• Renewable Resource Reliance: The system relies on renewable resources available locally within the agricultural system, reducing dependence on external, non-renewable inputs.

These principles guide organic farmers in creating environmentally friendly and productive agricultural systems.
In simple words: Organic farming principles include protecting the environment, keeping soil fertile, supporting biodiversity, recycling resources, caring for animals, carefully preparing products, and using local renewable resources.

🎯 Exam Tip: For principles-based questions, list each principle clearly and provide a brief explanation of what it entails, focusing on the "why" behind each principle.

Based on the explicit directive to process and map ONLY the questions located between page 43 and page 44 of the provided PDF, no content fitting the definition of a "Question" (i.e., a "Question N." block) was found within this specific page range. The content on page 43 comprises continuations of answers from earlier pages and website navigation/footer elements. Page 44 consists entirely of website navigation/footer elements. Therefore, no output can be generated for this specific request.