RBSE Solutions Class 6 Science Chapter 11 Natures Treasures

Nature's Treasures Class 6 Questions and Answers

RBSE Class 6 Science Chapter 11 Nature's Treasures Question Answer

Nature's Treasures Class 6 Question Answer - InText

 

Question 1. Surya, why do different types of vehicles go to different filling stations?
Answer: Different types of vehicles use different kinds of fuels. For example, some vehicles run on petrol, while others use diesel. This is why they need to go to separate filling stations that offer the correct fuel for their engine type.
In simple words: Vehicles use different fuels like petrol or diesel, so they need to visit specific stations for their type of fuel.

🎯 Exam Tip: When explaining differences, always provide concrete examples to make your answer clearer and more complete.

estion Answer - Exercise

 

Question 1. Match the natural resources shown in the figures with their jumbled names, and identify if they are renewable or non-renewable resources.

Answer:
In simple words: We matched the jumbled names to their correct natural resources based on the pictures, then decided if each resource can be replaced (renewable) or not (non-renewable).

🎯 Exam Tip: For matching questions, it's helpful to first write down the correct names for jumbled words before attempting to classify them. Visual cues can greatly assist in identification.

 

Question 2. State whether the following statements are True [T] or False [F]. If False, correct them.
(i) Nature has all the resources to meet human needs.
(ii) Machines are a resource found in nature.
(iii) Natural gas is a non-renewable resource.
(iv) Air is a renewable resource.
Answer:
(i) True
(ii) False. The correct statement is: Machines are man-made resources.
(iii) True
(iv) True
In simple words: We checked each statement to see if it was correct (True) or wrong (False). If a statement was wrong, we then wrote the right information.

🎯 Exam Tip: Always read True/False statements carefully, especially the correcting part. Make sure your correction directly addresses the false information.

 

Question 3. Fill in the blanks using the most appropriate option-
(i) A fuel that is commonly used in two wheelers like scooters or bikes is ..........
(a) Kerosene
(b) Petrol
(c) Diesel
(d) LPG
(ii) An example of a renewable resource is ..........
(a) Coal
(b) Water
(c) Natural gas
(d) Petrol
Answer:
(i) (b) Petrol
(ii) (b) Water
In simple words: We chose the best answer from the given options to complete each sentence correctly.

🎯 Exam Tip: For fill-in-the-blanks with options, eliminate clearly incorrect choices first to narrow down the possibilities and then select the most suitable answer.

 

Question 5. Why do we say that petroleum is a non-renewable resource?
Answer: Petroleum is a fossil fuel that takes millions of years to form deep inside the Earth. It is found in limited amounts, and once it's used up, it cannot be replaced within a human lifetime. Because it takes such a long time to develop and is in finite supply, petroleum is classified as a non-renewable resource.
In simple words: Petroleum takes millions of years to form and is limited. Once we use it, it's gone for good in our lifetime, so it's called non-renewable.

🎯 Exam Tip: When defining non-renewable resources, always include both the "long formation time" and "limited quantity" aspects for a complete answer.

 

Question 6. It is difficult to regrow forests. Justify this statement.
Answer: It is hard to regrow forests because trees take a very long time to reach maturity. Also, the natural balance and network of living things in a forest, called its ecological structure, are very complex and take ages to rebuild. Keeping a large number of trees healthy and safe for many years is also a big challenge.
In simple words: Regrowing forests is hard because trees grow slowly, and the complex nature of forest life takes a long time to heal.

🎯 Exam Tip: When justifying a statement, provide multiple reasons, like the time taken for growth and the complexity of the ecosystem, to strengthen your argument.

 

Question 7. Make a list of five daily activities in which you use natural resources. Suggest ways by which you can reduce their use.
Answer:

In simple words: We listed everyday things that use natural resources like wood, water, and fossil fuels. Then, we suggested ways to use less of these resources, such as using digital files instead of paper or cooking with solar power.

🎯 Exam Tip: For questions asking for lists and suggestions, organize your answer clearly, perhaps using a table, to present the information effectively and make it easy to read.

 

Question 8. List four activities that are possible due to the presence of air.
Answer: The presence of air makes the following four activities possible:
1. Breathing for living beings.
2. Lighting a fire.
3. Flying kites.
4. Photosynthesis in plants, which creates food.
In simple words: Air allows us to breathe, helps fires burn, lets kites fly, and is vital for plants to make their own food.

🎯 Exam Tip: When listing activities, choose diverse examples that highlight different properties or uses of the subject, like both biological and mechanical functions for air.

 

Question 9. How can you contribute towards enhancing the green cover of your locality? Make a list of actions to be taken.
Answer: We can help increase the green areas in our neighborhood by taking these actions:
1. Make sure to protect existing trees and green spaces from harm.
2. Take part in tree-planting events organized by the community.
3. Plant new trees in local parks and other open areas.
4. Support local schools and groups that work on green projects.
5. Encourage neighbors to plant trees in their yards, balconies, and around their homes.
In simple words: To make our area greener, we should protect existing plants, join tree planting, plant new trees ourselves, support green groups, and inspire others to plant trees too.

🎯 Exam Tip: When suggesting actions, aim for a mix of individual efforts (like planting) and community-level involvement (like participating in programs or supporting initiatives).

 

Question 10. In the given illustration, we see that food is being cooked. Answer the following questions-
(i) What type of energy is being used for cooking?
(ii) Name one benefit and one drawback of using this type of energy for cooking.
Answer:
(i) Solar energy is being used for cooking.
(ii) Advantage: Using solar energy does not cause any kind of pollution, making it very clean.
Disadvantage: This energy can only be used when the sun is out, so it is limited during the night or on cloudy days. Cooking also takes longer in a solar cooker compared to traditional methods.
In simple words: Food is being cooked with solar energy. The good thing is it doesn't pollute, but the bad thing is it only works when the sun is shining.

🎯 Exam Tip: For questions about benefits and drawbacks, always provide a clear positive and negative point, and elaborate briefly on each with a simple explanation.

 

Question 11. Cutting down trees on a large scale impacts the quality of the soil. Why do you think it is so?
Answer: When leaves fall from trees, they decay and add important nutrients back into the soil. This rich soil is then used by new plants and trees to grow. However, when many trees are cut down, this natural process of nutrient recycling is greatly reduced. This lack of decaying organic matter makes the soil poorer and less fertile over time, thus lowering its overall quality.
In simple words: Trees drop leaves that enrich the soil. Cutting trees stops this, so the soil loses nutrients and becomes less healthy.

🎯 Exam Tip: When explaining environmental impacts, trace the cause-and-effect relationship clearly, such as how deforestation directly leads to reduced nutrient cycling in the soil.

 

Question 12. Explain two ways in which human activities pollute the air. Propose one action which can help in reducing air pollution.
Answer: Human activities that cause air pollution include:
1. Using fossil fuels in vehicles and industries releases harmful smoke and gases into the atmosphere.
2. Cutting down forests removes trees that naturally clean the air by absorbing carbon dioxide and releasing oxygen, leading to more pollutants in the air.
Suggestion for reducing air pollution: People should be encouraged to use public transport and electric vehicles more often instead of personal gasoline cars. Planting more trees is also a great way to improve air quality.
In simple words: People pollute air by burning fuel in cars and factories, and by cutting down forests. To help, we should use public transport or electric cars more, and plant more trees.

🎯 Exam Tip: When asked for solutions, ensure they directly counter the problems identified. For example, if vehicles cause pollution, then promoting public transport is a logical solution.

 

Question 14. Fill up the blanks using the following terms- (fossil fuels, forest, air, petroleum, coal, water and non-renewable resource)

Answer:
In simple words: We completed the diagram by putting the given terms into the correct places. Renewable resources are those that can be replaced, like water, air, and forests. Non-renewable resources are limited, like fossil fuels (coal, natural gas, petroleum).

🎯 Exam Tip: When filling out diagrams, first categorize the terms (e.g., renewable vs. non-renewable) to help place them logically within the chart structure.

 

Question 15. There is an increasing demand of trees to meet the requirements of industries and for housing. Therefore. trees are being felled. Is it justified? Discuss and prepare a brief report.
Answer: The continuous cutting down of trees to satisfy the demands of industries and housing is not a good practice. To solve this problem, more trees should be planted, and existing forests must be protected. Additionally, we need to find new ways and alternative sources for materials so that we don't rely so much on trees.
Brief report-The following points are important to include:
1. The great importance of forests for the environment and living beings.
2. The negative effects of deforestation on the environment, such as climate change and loss of wildlife.
3. Practical steps and measures needed to conserve existing forests.
4. The development and use of alternative sources and materials to reduce our dependence on wood.
In simple words: Cutting down many trees for factories and homes is wrong. We need to plant more trees, protect forests, and find other materials to use instead of wood.

🎯 Exam Tip: When asked to "discuss" and "justify" an ethical or environmental issue, always state your stance clearly and support it with multiple factual points, often structured as a mini-report.

 

Question 16. Propose a plan to use less water in your school. What steps would you take to make this plan happen and how would it help the environment?
Answer: Our plan to reduce water usage in school would involve these steps:
1. We will fix any water leaks, like dripping taps, in all parts of the school.
2. We will start awareness campaigns to teach students and staff not to waste water and how to save it.
3. We will try to collect rainwater, which can then be used for gardening or cleaning.
These steps will help the environment by saving precious freshwater resources. By reducing wastage, we ensure more water is available for nature and for future needs, supporting local ecosystems.
In simple words: To save water in school, we will fix leaks, teach everyone to conserve water, and collect rainwater. This helps the environment by saving water for nature and the future.

🎯 Exam Tip: When proposing a plan, include both practical actions (e.g., fixing leaks) and educational/awareness components (e.g., campaigns) for a comprehensive approach.

Multiple Choice Questions

 

Question 1. Which of the following is present in air?
(a) Nitrogen
(b) Oxygen
(c) Argon
(d) All of the options
Answer: (d) All of the options
In simple words: Air is a mixture of several gases, including Nitrogen, Oxygen, and Argon.

🎯 Exam Tip: Remember that air is not a single gas but a combination of many, with nitrogen and oxygen being the most abundant.

 

Question 2. Toorji Ka Jhalra Bawadi is situated in-
(a) Rajasthan
(b) Gujarat
(c) Madhya Pradesh
(d) Uttar Pradesh
Answer: (a) Rajasthan
In simple words: Toorji Ka Jhalra Bawadi, a famous stepwell, is located in the state of Rajasthan.

🎯 Exam Tip: For location-based questions, it's helpful to associate historical or geographical landmarks with their respective states or regions.

 

Question 3. When is World Water Day celebrated-
(a) 24 April
(b) 22 March
(c) 1 December
(d) 5 June
Answer: (b) 22 March
In simple words: World Water Day, a global event to raise awareness about water issues, is celebrated every year on March 22nd.

🎯 Exam Tip: It is good practice to memorize dates of important environmental days to answer such direct knowledge questions accurately.

 

Question 4. The main source of energy on earth is-
(a) Forest
(b) Air
(c) Sun
(d) Water
Answer: (c) Sun
In simple words: The Sun is the primary natural source that provides most of the energy for Earth's processes and living things.

🎯 Exam Tip: Understand the fundamental sources of energy. The Sun is crucial for almost all life and energy cycles on Earth.

 

Question 6. Which of the following is used for making bricks?
(a) Granite
(b) Sandstone
(c) Marble
(d) Laterite
Answer: (d) Laterite
In simple words: Laterite is a type of soil and rock that is commonly used to make bricks, especially in certain regions.

🎯 Exam Tip: Be familiar with common materials and their uses, especially in construction or manufacturing processes.

 

Question 7. The mineral used in making normal mobile phones is-
(a) Silver
(b) Copper
(c) Cobalt
(d) All of the options
Answer: (d) All of the options
In simple words: Mobile phones contain many different minerals and metals, including silver, copper, and cobalt, all of which are important for their functions.

🎯 Exam Tip: Modern electronics often contain a variety of precious and common metals. Knowing a few key examples can be helpful.

 

Question 8. Which of the following is not a natural resource?
(a) Solar energy
(b) Solar panel
(c) Soil
(d) Forest
Answer: (b) Solar panel
In simple words: A solar panel is something made by people to capture sunlight, while solar energy, soil, and forests are all found naturally in nature.

🎯 Exam Tip: Differentiate between natural resources (found in nature) and man-made resources (created by humans, often using natural resources).

 

Question 10. Required for the survival of the living things-
(a) Nitrogen
(b) Argon
(c) Carbon-dioxide
(d) Oxygen
Answer: (d) Oxygen
In simple words: Oxygen is a gas that most living things, including humans and animals, need to breathe and stay alive.

🎯 Exam Tip: Focus on the most immediate and vital needs for survival when considering essential elements for living things.

Fill in the blanks

 

Question 1. Moving air is called ..........
Answer: wind
In simple words: When air moves from one place to another, we call it wind.

🎯 Exam Tip: Simple definitions are often best for fill-in-the-blank questions; focus on direct and accurate terms.

 

Question 2. The solar panels capture the .......... and produce electricity.
Answer: Sun's energy
In simple words: Solar panels collect energy from the sun to make electricity.

🎯 Exam Tip: Relate technologies (solar panels) to their primary energy source (Sun's energy).

 

Question 3. The air which surrounds the Earth is a mixture of ..........
Answer: gases
In simple words: The air around our planet is made up of many different gases mixed together.

🎯 Exam Tip: Remember that air is a composition, not a single element.

 

Question 4. These resources which we get from nature are called .......... resources.
Answer: natural
In simple words: Things we get from nature, like water or soil, are called natural resources.

🎯 Exam Tip: Understand the basic definition of natural resources as anything useful derived from the environment.

 

Question 5. .......... covers about two-thirds of the Earth's surface.
Answer: Water
In simple words: Most of the Earth's surface, about two-thirds, is covered by water.

🎯 Exam Tip: Recall the proportion of Earth's surface covered by water to answer such factual questions.

 

Question 6. Sunlight helps plants prepare ..........
Answer: food
In simple words: Plants use sunlight to make their own food through a process called photosynthesis.

🎯 Exam Tip: Connect sunlight directly to the fundamental process of photosynthesis and plant sustenance.

 

Question 2. The water found in oceans and seas is soft. (True/False)
Answer: False
In simple words: Water in oceans and seas is salty, not soft.

🎯 Exam Tip: Differentiate between fresh water (often soft) and saltwater (hard/saline), especially when discussing large bodies of water like oceans.

 

Question 3. Petrol, diesel and kerosene are obtained from petroleum. (True/False)
Answer: True
In simple words: Petrol, diesel, and kerosene are all products that come from refining crude oil, which is petroleum.

🎯 Exam Tip: Understand the relationship between crude oil (petroleum) and its various refined products used as fuels.

 

Question 4. Electric vehicles do not emit any kind of smoke. (True/False)
Answer: True
In simple words: Electric vehicles run on electricity, so they do not have an exhaust pipe and produce no direct smoke or tailpipe emissions.

🎯 Exam Tip: Remember that "zero-emission" typically refers to tailpipe emissions. The electricity generation for EVs might still have emissions, but the vehicle itself does not.

Match the words given in Column-I with Column-II

 

Question 1. Match the following.

Answer:
In simple words: We matched each item from Column-I with its correct pair from Column-II. For example, moving air is wind, diesel comes from petroleum, aluminium is a mineral, and water can be found as snow.

🎯 Exam Tip: When matching, identify the core relationship between the terms (e.g., source-product, form-state) to make accurate pairs.

 

Question 2. Match the following.

Answer:
In simple words: We correctly paired items from Column-I with Column-II. Windmills use air, solar panels use the sun, natural gas is a fossil fuel, and granite is a type of mineral.

🎯 Exam Tip: Pay attention to the function or classification of each item when matching. For example, wind is a force that drives windmills, and granite is a type of rock, thus a mineral.

Very Short Answer Type Questions

 

Question 2. What is the composition of the air present around the earth?
Answer: The air around the Earth is a mixture of various gases. It mainly contains about 78% nitrogen, 21% oxygen, 1% argon, carbon dioxide, and small amounts of other gases. This specific mix of gases is crucial for supporting life on our planet.
In simple words: Air around Earth is mostly nitrogen (78%) and oxygen (21%), with a little bit of argon, carbon dioxide, and other gases.

🎯 Exam Tip: When listing components, always include the approximate percentages for major gases to show a precise understanding of air composition.

 

Question 3. What is the meaning of wind?
Answer: Wind is simply moving air. It occurs when air travels from one place to another, often due to differences in air pressure and temperature. Wind is an important natural phenomenon, influencing weather patterns and helping with processes like pollination.
In simple words: Wind is just air that is moving.

🎯 Exam Tip: For simple definitions, provide a concise answer. Adding a brief explanatory sentence can sometimes enhance clarity without making it too long.

 

Question 4. For which activities do we need water in our daily life?
Answer: We need water for many daily activities. These include drinking, cooking food, bathing, washing clothes, cleaning our homes, and growing crops for food. Water is also essential for industrial work, playing a role in almost every aspect of our lives.
In simple words: We need water every day for drinking, cooking, washing, cleaning, growing food, and in factories.

🎯 Exam Tip: When listing uses for a resource, try to cover different categories like personal, household, agricultural, and industrial uses.

 

Question 5. Why is the water of oceans and seas not suitable for use?
Answer: The water in oceans and seas is not suitable for most uses because it is very salty (saline). This high salt content makes it unfit for drinking, farming (agriculture), and many industrial processes. Desalination, which removes salt, is possible but often expensive.
In simple words: Ocean and sea water is too salty, so we cannot drink it, use it for farming, or in many factories.

🎯 Exam Tip: Focus on the key property (salty/saline) that renders ocean water unsuitable, and briefly mention the implications for various uses.

 

Question 6. Suggest some measures to reduce water loss.
Answer: To reduce water loss, we can take several steps. These include turning off the tap tightly when it's not in use, quickly fixing any water leaks, and reusing water whenever possible (like using greywater for plants). Collecting and storing rainwater, known as rainwater harvesting, is also a very effective way to save water.
In simple words: To save water, turn off taps, fix leaks, reuse water, and collect rainwater.

🎯 Exam Tip: Provide a mix of practical, everyday actions and larger-scale solutions like rainwater harvesting to show a comprehensive understanding of water conservation.

 

Question 7. Why do many familias in India offor water to the Sun early in the morning?
Answer: In many families across India, people offer water to the Sun early in the morning as a religious and cultural practice. This tradition is a way to show respect and gratitude to the Sun God, Surya, who is considered a source of life, energy, and well-being. It is believed to bring good health, prosperity, and spiritual purity. This practice is often accompanied by chanting prayers.
In simple words: Many Indian families offer water to the Sun as a religious custom to show respect, gratitude, and ask for blessings like good health.

🎯 Exam Tip: When explaining cultural practices, clearly state the ritual, its underlying beliefs, and the significance for those who follow it.

 

Question 9. Why should we wash our hands thoroughly after touching soil from different places?
Answer: We should wash our hands thoroughly after touching soil from different places. This is because soil can sometimes contain garbage and germs. These germs can be harmful and might cause us to get sick. Washing hands helps remove these harmful germs. Proper hygiene prevents the spread of diseases.
In simple words: We should wash our hands well after touching soil from different places because it might have germs that can make us sick.

🎯 Exam Tip: Always mention both the action (washing hands) and the reason (germs/harmful substances) for full marks.

 

Question 10. Why is soil a priceless asset?
Answer: Soil is considered a priceless asset because it supports a wide variety of life forms, known as biodiversity. Many plants grow in the soil, which in turn feed animals and humans. It is essential for agriculture and provides a home for countless organisms. Soil plays a crucial role in maintaining ecosystems.
In simple words: Soil is very important because it helps many different kinds of plants and animals live. It's like the foundation for all life on land.

🎯 Exam Tip: When discussing the importance of natural resources, link them to supporting life and ecosystems to score well.

 

Question 11. How is soil formed?
Answer: Soil is formed over a very long period, taking thousands of years. It happens through the breaking down of rocks. The sun, water, and tiny living organisms work together to slowly break these rocks into smaller pieces. This slow process turns solid rock into the fine material we know as soil. Weathering and erosion are key processes in soil formation.
In simple words: Soil is made over many, many years as rocks slowly break apart due to the sun, water, and small living things.

🎯 Exam Tip: Remember to mention the key factors (sun, water, organisms) and the long time frame when explaining soil formation.

 

Question 12. What are rocks made of?
Answer: Rocks are made of minerals. Minerals are naturally occurring solid substances with a specific chemical makeup. Different types of rocks contain various combinations of minerals, which gives them their unique properties and appearance. For instance, granite is made up of quartz, feldspar, and mica.
In simple words: Rocks are made up of smaller pieces called minerals.

🎯 Exam Tip: A simple, direct answer focusing on minerals is sufficient for this question. You can add a common example of rock and its mineral components to show deeper understanding.

 

Question 13. Which important metals are obtained from mining?
Answer: Many important metals are obtained through mining. Some key examples include aluminum, gold, copper, and iron. These metals are essential for many industries and everyday products. Mining allows us to access these valuable resources deep within the Earth.
In simple words: Important metals like aluminum, gold, copper, and iron are dug out of the earth through mining.

🎯 Exam Tip: Listing a few common and important metals is good, but mentioning their use can enhance your answer.

 

Question 14. Most of the vehicles we use for transportation use which fuel?
Answer: Most vehicles we use for transportation primarily use fossil fuels. These include petrol (gasoline) and diesel. These fuels are burned in engines to create power for movement. However, there's a growing shift towards electric vehicles which use electricity instead. These traditional fuels are a major source of energy for transport.
In simple words: Most vehicles use fuels like petrol and diesel for transportation.

🎯 Exam Tip: Be specific about the type of fuel (fossil fuels, petrol/diesel) and mention the alternative (electricity) if you can.

 

Question 16. Write the full form of CNG and LPG?
Answer: The full forms are:
CNG = Compressed Natural Gas
LPG = Liquefied Petroleum Gas
Both are commonly used as fuels, with CNG often seen in vehicles and LPG in homes for cooking. These gases offer cleaner burning alternatives to traditional fossil fuels.
In simple words: CNG means Compressed Natural Gas, and LPG means Liquefied Petroleum Gas.

🎯 Exam Tip: Make sure to spell out each word correctly when giving full forms.

 

Question 17. Give two ways of how we can contribute towards the conservation of fossil fuels?
Answer: We can help conserve fossil fuels in two main ways:
(i) By walking or cycling to nearby places instead of using vehicles. This reduces the amount of petrol or diesel burned. This also promotes a healthy lifestyle.
(ii) By using public transport like buses or trains. When many people travel together, fewer individual vehicles are on the road, saving fuel. This reduces our reliance on personal vehicles.
In simple words: We can save fossil fuels by walking, cycling, or using public transport for short distances.

🎯 Exam Tip: Focus on actions that directly reduce fossil fuel consumption. Practical examples are always good.

 

Question 18. What are renewable resources?
Answer: Renewable resources are natural resources that can be replaced or restored over a reasonable period of time. This means they are not used up permanently. Examples include air, water, and forests. These resources are naturally replenished by Earth's processes. Sunlight is another excellent example of a renewable resource.
In simple words: Renewable resources are natural things that get refilled or made again by nature over time, so they don't run out easily.

🎯 Exam Tip: Define renewable resources by focusing on their ability to be replenished or restored within a short time frame.

 

Question 19. What is meant by 'forest'?
Answer: A forest is a large area of land covered densely with various types of trees and other plants. It is a complex ecosystem that supports a wide range of animal and plant life. Forests are crucial for the environment as they produce oxygen, absorb carbon dioxide, and help regulate climate. They also provide habitat for countless species.
In simple words: A forest is a big area with many different kinds of trees and plants growing close together.

🎯 Exam Tip: A concise definition focusing on dense tree cover and its ecological significance is ideal.

 

Question 20. Give an example of recycling in nature.
Answer: An excellent example of recycling in nature is how nutrients are returned to the soil. When leaves fall from trees, they decay and decompose. This process enriches the soil with essential nutrients. These nutrients are then used by new plants and trees to grow, completing a natural cycle. This is nature's way of reusing materials. This continuous cycle ensures the soil remains fertile.
In simple words: When leaves fall from trees and rot, they put nutrients back into the soil, which helps new plants grow. This is like nature recycling.

🎯 Exam Tip: Choose a clear and simple example like the nutrient cycle in forests to explain natural recycling.

 

Question 21. Which major minerals are used in mobile phone manufacturing?
Answer: Several major minerals are used in manufacturing mobile phones. These include tantalum, silver, copper, and cobalt. These minerals are crucial for the phone's various components, such as circuits, batteries, and screens. The demand for these minerals is high due to the widespread use of mobile technology. Gold is also used in small amounts for connectors.
In simple words: Important minerals like tantalum, silver, copper, and cobalt are used to make mobile phones.

🎯 Exam Tip: List a few distinct minerals and briefly state their importance (e.g., for circuits, batteries) if possible.

 

It is difficult to hold our breath for a long time because the air we breathe in contains oxygen. Our body needs this oxygen to work properly. When we hold our breath for too long, our body does not get enough oxygen. This lack of oxygen makes us feel uncomfortable and causes us to eventually breathe again.

 

Question 2. What is meant by windmill? Tell its use.
Answer: A windmill is a machine that looks like a large spinning wheel with big blades. These blades are turned by the wind. Windmills are very useful for different tasks. They can be used to grind flour, pump water from a well, or generate electricity. The power of the wind is converted into useful mechanical or electrical energy. Modern windmills are primarily used for power generation.
In simple words: A windmill is a big machine with blades that spin in the wind. It is used to make flour, pump water, or create electricity.

🎯 Exam Tip: When explaining mechanical devices, describe both their structure (spinning wheel, blades) and their practical applications (grinding, pumping, electricity).

 

Question 3. What are windmill farms? Tell the names of the major windmill farms of India.
Answer: Windmill farms are large areas of land where many windmills are installed together. These farms use the power of the wind to generate electricity on a large scale. They are an important source of renewable energy. India has several major windmill farms, including:
1. Muppandal Wind Farm in Tamil Nadu
2. Jaisalmer Wind Park in Rajasthan
3. Brahmanvel Wind Farm in Maharashtra
These farms help in meeting the country's energy needs sustainably.
In simple words: Windmill farms are big places with many windmills that make electricity from wind. Important ones in India are in Tamil Nadu (Muppandal), Rajasthan (Jaisalmer), and Maharashtra (Brahmanvel).

🎯 Exam Tip: For location-based questions, list specific names and states accurately. Also, briefly explain the purpose of such farms.

 

Question 4. How does water get polluted? What is its effect?
Answer: Water gets polluted when we throw garbage and waste materials into freshwater sources like rivers, lakes, and ponds. This pollution also happens when waste from homes and industries mixes with these water bodies. The effect of this pollution is that the water becomes unsafe for living beings to use. It can harm aquatic life and also make people sick if consumed. Clean water is vital for all life forms.
In simple words: Water gets polluted when trash and waste from homes and factories are put into it. This makes the water unsafe for all living things.

🎯 Exam Tip: Clearly state the sources of pollution (garbage, industrial/domestic waste) and the negative consequences (unsuitable for use, harm to life).

 

Question 5. Give three examples of the use of solar energy.
Answer: Solar energy is very versatile and can be used in many ways:
1. Solar panels collect sunlight and turn it into electricity. This electricity can power homes and businesses.
2. Solar cookers use sunlight to cook food. They are an eco-friendly way to prepare meals without using gas or wood.
3. Solar water heaters use the sun's heat to warm up water for bathing or other uses. This saves on electricity or gas bills.
These applications highlight the potential of clean energy.
In simple words: Solar energy can be used to make electricity with solar panels, cook food in solar cookers, and heat water with solar water heaters.

🎯 Exam Tip: Provide distinct and common examples of solar energy use. Briefly describe how each example works.

 

Life on Earth cannot be imagined without the Sun. The Sun is the main source of energy for our planet. Plants get their energy from the Sun to make food. Animals eat these plants and also other animals, helping them grow. This entire cycle of life on Earth depends on the Sun. So, all living things rely on the Sun as their primary energy source.

 

Question 7. Why should we conserve and use forests responsibly?
Answer: We should conserve and use forests responsibly because they are natural homes for many wild animals, including birds and insects. Forests provide them with food and shelter. All living things in nature depend on other life forms for survival, and the diversity of life in forests ensures food for everyone. Over time, forest cover has been shrinking due to human activities like large-scale tree cutting. It takes many years for a new forest to grow back or for lost forests to recover. Therefore, we must protect and use forests carefully, allowing them enough time to regrow. Protecting forests helps maintain ecological balance.
In simple words: We must protect forests and use them wisely because they are home to many animals and provide food for all living things. Forests take a very long time to grow back if cut down.

🎯 Exam Tip: Emphasize the ecological importance of forests (habitat, food source, biodiversity) and the long regeneration time when explaining conservation needs.

 

Question 8. What is 'Van Mahotsav'? Explain its purpose.
Answer: 'Van Mahotsav' is a week-long festival dedicated to trees, celebrated across India every July. During this festival, new plants and trees are planted, and people are taught about the importance of respecting and protecting forests. The main goal of Van Mahotsav is to increase the green cover and raise environmental awareness. This initiative promotes afforestation and environmental stewardship.
In simple words: Van Mahotsav is a week-long tree festival in July where people plant new trees and learn why forests are important, to make our country greener.

🎯 Exam Tip: Define 'Van Mahotsav' by mentioning its duration (week-long), timing (July), and core activities (planting trees, raising awareness).

 

Question 9. Which major minerals are obtained from rocks? What are their uses?
Answer: Important metals like aluminum, gold, copper, and iron are obtained from minerals found in rocks. These minerals are extracted through mining. These metals have many uses: aluminum is used in airplanes, cars, and foil; gold is used in jewelry and electronics; copper is vital for electrical wiring; and iron is used in building construction and machinery. Each mineral has unique properties that make it valuable for various applications.
In simple words: Big metals like aluminum, gold, copper, and iron come from minerals in rocks. They are used to make things like airplanes, cars, jewelry, and electric parts.

🎯 Exam Tip: List a few major metals and provide at least one key use for each to show comprehensive understanding.

 

Question 10. Name the traditional domestic fuels. Which fuels are now replacing them?
Answer: Traditionally, domestic fuels included coal, firewood (from forests), and natural gas. These were commonly used for cooking and heating. Now, these traditional fuels are being replaced by cleaner and more efficient options like Liquefied Petroleum Gas (LPG) and electricity (often from solar panels). The shift helps reduce indoor air pollution and forest depletion. This transition aims for sustainable energy use.
In simple words: Old home fuels were coal, wood, and natural gas. Now, people are using cleaner fuels like LPG and electricity instead.

🎯 Exam Tip: Clearly distinguish between traditional fuels and their modern replacements, briefly indicating the benefit of the newer options.

 

Question 12. Differentiate between renewable and non-renewable resources.
Answer:

Both types of resources are crucial for human life, but their management requires different strategies. Renewable resources are essential for long-term sustainability.
In simple words: Renewable resources can be replaced quickly by nature, like air and water. Non-renewable resources take a very long time to form and will run out, like oil and coal.

🎯 Exam Tip: When differentiating, provide clear contrasting points for definition, availability, and examples for each category.

 

Question 13. Why should we conserve natural resources?
Answer: We should conserve natural resources because we get these valuable resources from nature, and we use them constantly for our daily needs. It is important to protect them and use them carefully without wasting them. By doing this, we can also save them for future generations. This responsible use ensures that we meet our needs without harming the environment. Conservation helps maintain the balance of ecosystems.
In simple words: We should save natural resources because we get everything from them. We need to use them wisely so they last for us and for people in the future, and also to protect nature.

🎯 Exam Tip: Highlight the dual benefits of conservation: ensuring availability for current and future generations, and protecting the environment.

 

From ancient times, India has had a tradition of respecting, protecting, and preserving forests. Many efforts have been made by common people to stop trees from being cut down, thereby saving forests. One famous effort is the Chipko movement. It began in the early 1970s in Uttarakhand. Local women actively took part in this movement, hugging trees to prevent them from being felled by loggers.

Long Answer Type Questions

 

Question 1. Where do we get water from? What is the source of water?
Answer: Water covers about two-thirds of the Earth's surface. Most of this water is found in oceans and seas. However, this ocean water is salty, which makes it unsuitable for drinking, farming, and industrial use. For all these activities, we need freshwater. Freshwater is found in forms like ice sheets, snow, rivers, and lakes on the Earth's surface, and also underground. Freshwater stored as ice sheets, snow, or underground water can be hard to reach. Only a very small part of the freshwater in ponds, rivers, lakes, and wells is easily accessible for human use. The sun's energy drives the water cycle, evaporating water from oceans and returning it as fresh precipitation.
In simple words: Most of Earth's water is in oceans and is salty. We get freshwater from ice, snow, rivers, lakes, and underground, but only a small amount is easy to use.

🎯 Exam Tip: When explaining water sources, differentiate between total water (mostly saline) and accessible freshwater, listing various forms of freshwater.

 

Question 2. Why is it necessary to find alternative sources of fossil fuels?
Answer: It is necessary to find alternative sources for fossil fuels for several important reasons. Fossil fuels are found in limited amounts, and if we keep using them at the current rate, they will soon run out. This scarcity makes it crucial to explore other energy options. Also, when fossil fuels burn, they produce smoke and carbon dioxide, which pollutes the air. Being too dependent on fossil fuels for transport and household energy causes widespread air pollution. To avoid these problems and ensure a sustainable future, we must find and use alternative energy sources. Renewable energy sources offer a cleaner and more sustainable path forward.
In simple words: We need new energy sources because fossil fuels are limited and will run out. Also, burning fossil fuels pollutes the air, harming our planet.

🎯 Exam Tip: Focus on two main reasons: the limited nature of fossil fuels and the environmental pollution they cause, to justify the need for alternatives.

 

Question 3. Explain non-renewable resources giving examples.
Answer: Non-renewable resources are natural resources that take millions of years to form. They are present in limited quantities on Earth. Once these resources are used up, they cannot be replaced or replenished within a short, reasonable period. This means they will eventually get exhausted. Examples of non-renewable natural resources include minerals, soil, rocks, coal, petroleum (oil), and natural gas. These resources are vital for our energy and industrial needs, but their finite nature requires careful management. Fossil fuels are a significant category of non-renewable resources.
In simple words: Non-renewable resources are natural things that take millions of years to make and are limited. Once used, they cannot be replaced quickly. Examples are coal, oil, and natural gas.

🎯 Exam Tip: Define non-renewable resources by their long formation time, limited quantity, and inability to be replenished quickly, then provide clear examples.

 

Water harvesting is a method for saving water. In many buildings, rainwater is collected and stored in large amounts for later use. This process is called rainwater harvesting. This practice has been used in India for a very long time. For example, stepwells, known as Bawadi in Rajasthan and Vav in Gujarat, were built to collect water because water was scarce in those areas. These stepwells have a special way of collecting water. They store not only rainwater but also water that seeps in from nearby lakes, ponds, and rivers. The walls of the deep trenches dug in the ground are lined with stone blocks that allow water to seep through.

 

Question 2. How do rocks play an important role in human life and why is their conservation necessary?
Answer: Rocks play a very important role in human life. They are used in constructing houses, buildings, temples, roads, dams, and tabletops. Some rocks, like slate, are used for roofing, and laterite is used as a building material for bricks. Important rocks like granite, sandstone, and marble are widely used. Minerals, which are obtained from rocks, are used to make aircraft, cars, jewelry, cosmetics, electrical appliances, and electronic equipment. Thus, rocks are crucial for our daily lives. Their conservation is necessary because it takes thousands to millions of years for rocks to form. Therefore, we must protect and use them responsibly to ensure they are available for future generations. This careful use helps preserve these geological treasures.
In simple words: Rocks are important because we use them to build things like houses and roads, and they provide minerals for making many products. It takes a very, very long time for rocks to form, so we must use them carefully and protect them.

🎯 Exam Tip: Explain the dual importance of rocks: as building materials and as sources of minerals. Emphasize their slow formation time as the reason for conservation.

 

Question 3. What is fossil fuel? Explain its use.
Answer: Fossil fuels are natural fuels like petroleum, natural gas, and coal. They are formed from the remains of tiny organisms and plants that were buried deep inside the Earth millions of years ago. Over time, heat and pressure turned these remains into fossil fuels. These fuels take millions of years to develop. Fossil fuels have many uses. Petroleum gives us petrol, diesel, and kerosene. Petrol and diesel are the most common fuels for vehicles. Kerosene is used in lamps and stoves. Natural gas is used for cooking and heating in homes and industries. Coal is used to generate electricity and in factories. These fuels are a primary energy source for industries and transportation. However, their combustion also leads to environmental pollution.
In simple words: Fossil fuels are natural fuels like petroleum, natural gas, and coal that formed over millions of years from old plants and animals. We use them mainly for powering vehicles, cooking, and making electricity.

🎯 Exam Tip: Define fossil fuels by their origin (ancient organic matter) and formation time (millions of years). Then, list specific examples and their common uses.

 

Question 4. What is meant by natural resources? How are they classified?
Answer: Natural resources are those useful things that we get from nature. They are found naturally on Earth and are important for human survival and activities. Examples include air, water, solar energy, forests, soil, rocks, minerals, and fossil fuels. Over time, many of these resources can be restored by natural processes. Based on this, natural resources are classified into two main categories:
(1) Renewable resources: These are resources that can be renewed, replenished, or restored within a reasonable period. They do not run out easily. Examples are air, water, and forests, which nature renews constantly. Solar energy is also a key renewable resource.
(2) Non-renewable resources: These are resources that take millions of years to form. They are found in limited amounts and, once used, get exhausted. They cannot be produced or refilled within a short, reasonable time. Examples are minerals, soil, rocks, coal, petroleum, and natural gas. These resources need careful management.
In simple words: Natural resources are useful things we get from nature, like air, water, and soil. They are divided into two types: renewable, which can be replaced (like sunlight and water), and non-renewable, which take a very long time to form and can run out (like oil and coal).

🎯 Exam Tip: Clearly define natural resources first, then provide a structured classification into renewable and non-renewable types, with examples for each.

RBSE Class 6 Science Chapter 11 Notes

Class 6 Science Chapter 11 Notes RBSE - Nature's Treasures Class 6 Notes

• 1. Resources needed for our survival are provided by nature.
• 2. Resources provided by nature are called natural resources. Some important natural resources are air, water, energy from the Sun, forests, soil, rocks, minerals, and fossil fuels.
• 3. The air around the Earth is a mixture of various gases, including nitrogen (78%), oxygen (21%), argon, carbon dioxide, and other gases in small amounts.
• 4. Water covers about two-thirds of the Earth's surface. Most of this water is found in oceans and seas.
• 5. Sunlight helps plants make food. The Sun also gives all living beings on Earth heat and light. It is their main energy source.
• 6. Forests are large areas with a dense growth of various types of plants.
• 7. Soil is formed when rocks break apart over a long time (thousands of years) due to the actions of the Sun, water, and living organisms. Soil is a valuable treasure that supports many different kinds of life.
• 13. Resources that are in limited quantities and do not get refilled within a reasonable period are called non-renewable resources. Example: Mineral, soil, coal, petroleum, etc.
• 14. All living beings, including humans, depend on natural resources for their survival, so we should use them wisely.