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Chapter 11. Nature`s Treasures

Chapter 11. Nature's Treasures

These CBSE Notes – Key Points are prepared according to the latest NCERT Curiosity textbook and the latest CBSE competency-based pattern. They provide a quick revision of important concepts, definitions, natural resources, conservation methods, and scientific terms covered in the chapter.

CBSE Notes – Key Points

These notes are useful for quick revision before examinations. Read the important keywords, definitions, tables, scientific terms, and facts carefully to strengthen your conceptual understanding.

Important Keywords

The following keywords are important for understanding the chapter.

Keyword	Meaning
Natural Resource	A useful material obtained directly from nature.
Renewable Resource	A resource that can be naturally replenished.
Non-renewable Resource	A resource available in limited quantity that cannot be replaced quickly.
Conservation	Careful use and protection of natural resources.
Biodiversity	Variety of living organisms found in an area.
Afforestation	Planting new trees to increase forest cover.
Deforestation	Large-scale cutting of forests.
Rainwater Harvesting	Collection and storage of rainwater for future use.
Fossil Fuel	Fuel formed from the remains of ancient plants and animals.
Weathering	Breaking down of rocks into smaller particles.

Types of Natural Resources

Natural resources are broadly classified into renewable and non-renewable resources.

Renewable Resources	Non-renewable Resources
Can be replenished naturally.	Take millions of years to form.
Available again after use.	Available in limited quantity.
Cause comparatively less pollution.	Excessive use leads to depletion.
Examples: Air, Water, Sunlight, Wind.	Examples: Coal, Petroleum, Natural Gas, Minerals.

Air

Air is essential for all living organisms and supports many natural processes.

Gas	Approximate Percentage	Importance
Nitrogen	78%	Supports the nitrogen cycle.
Oxygen	21%	Required for respiration.
Other Gases	1%	Include carbon dioxide, argon, and others.

Importance of Water

Water is one of the most valuable natural resources.

• Essential for drinking.
• Required for cooking.
• Used in agriculture.
• Needed in industries.
• Supports all living organisms.

Water Conservation

Freshwater is limited; therefore, it should be conserved.

• Practice rainwater harvesting.
• Repair leaking taps.
• Reuse water whenever possible.
• Avoid unnecessary wastage.
• Keep rivers and lakes pollution-free.

Importance of the Sun

The Sun is the ultimate source of energy on Earth.

• Provides light and heat.
• Helps plants prepare food.
• Supports the water cycle.
• Produces solar energy.

Importance of Forests

Forests are among the most valuable natural resources.

• Release oxygen.
• Absorb carbon dioxide.
• Provide habitat for wildlife.
• Prevent soil erosion.
• Maintain ecological balance.
• Provide food, medicines, and timber.

Soil

Soil is formed by the weathering of rocks and supports plant growth.

• Provides nutrients to plants.
• Stores water.
• Supports agriculture.
• Provides habitat for many organisms.

Rocks and Minerals

Rocks and minerals are important natural resources used in everyday life.

Resource	Uses
Rocks	Buildings, roads, monuments.
Iron	Machines and vehicles.
Copper	Electrical wires.
Aluminium	Utensils and aircraft.

Fossil Fuels

Fossil fuels are important but limited energy resources.

• Coal
• Petroleum
• Natural Gas

Uses

• Transportation
• Electricity generation
• Industries
• Cooking fuel

Ways to Conserve Natural Resources

Every individual should contribute towards conserving nature's treasures.

• Plant more trees.
• Save electricity.
• Use water wisely.
• Reduce, Reuse and Recycle materials.
• Prefer renewable sources of energy.
• Protect forests and wildlife.
• Avoid pollution.

Important Scientific Terms

Learn these scientific terms carefully for examinations.

Scientific Term	Meaning
Photosynthesis	Preparation of food by green plants using sunlight.
Ecological Balance	Stable relationship among living organisms and their environment.
Habitat	Natural home of an organism.
Weathering	Breaking down of rocks into soil.
Solar Energy	Energy obtained from the Sun.

Important Facts

Remember these important facts for examinations.

• Natural resources are gifts of nature.
• The Sun is the primary source of energy.
• Freshwater is limited and should be conserved.
• Forests maintain biodiversity and ecological balance.
• Soil is essential for agriculture.
• Rocks contain useful minerals.
• Fossil fuels are non-renewable resources.
• Renewable resources should be used as much as possible.
• Conservation helps protect resources for future generations.
• Every citizen has a responsibility to protect nature.

Quick Revision

Revise the following points before your examination.

• Natural resources are essential for life.
• Air, water, sunlight, forests, soil, rocks, and minerals are important natural resources.
• Renewable resources can be replenished naturally.
• Non-renewable resources should be used carefully.
• Rainwater harvesting helps conserve water.
• Forests prevent soil erosion and support biodiversity.
• Fossil fuels are limited sources of energy.
• Reduce, Reuse, and Recycle help conserve resources.
• Renewable energy reduces pollution.
• Conserving nature's treasures ensures a sustainable future.

Chapter 11. Nature`s Treasures

Chapter 11. Nature's Treasures

Nature provides all the basic resources required for life on Earth. Air, water, sunlight, soil, forests, rocks, minerals, and fossil fuels are valuable gifts of nature. Human beings, plants, and animals depend upon these resources for survival and development. Some resources are available in abundance, while others are limited. Therefore, it is our responsibility to use natural resources wisely and conserve them for future generations.

CBSE Full Notes

These detailed notes explain the importance of natural resources, their classification, uses, conservation methods, and their role in maintaining ecological balance. The notes are prepared according to the latest NCERT Curiosity textbook and CBSE competency-based pattern.

Nature's Treasures

Everything that we obtain directly from nature and use in our daily life is called a natural resource. Nature provides resources that help us breathe, grow food, build houses, manufacture goods, generate energy, and maintain ecological balance. These valuable resources are often referred to as Nature's Treasures.

Examples of Nature's Treasures

• Air
• Water
• Sunlight
• Soil
• Forests
• Wildlife
• Rocks and Minerals
• Fossil Fuels

Air – The Invisible Resource

Air is one of the most important natural resources. Every living organism depends upon air for survival. It contains several gases mixed together. Oxygen supports respiration, while carbon dioxide is required by green plants during photosynthesis. Nitrogen plays an important role in maintaining the balance of the atmosphere and is also useful for plant growth through the nitrogen cycle.

Gas	Approximate Percentage	Importance
Nitrogen	78%	Supports plant growth and maintains atmospheric balance.
Oxygen	21%	Essential for respiration.
Carbon Dioxide and Other Gases	1%	Required for photosynthesis and other natural processes.

Importance of Water

Water is essential for all living organisms. It is required for drinking, cooking, agriculture, industries, cleaning, sanitation, and many biological processes. Although nearly three-fourths of Earth's surface is covered with water, only a small fraction is available as freshwater. Hence, water should be used carefully.

Uses of Water

• Drinking and cooking.
• Irrigation of crops.
• Industrial production.
• Hydroelectric power generation.
• Cleaning and sanitation.

Water Conservation

Freshwater is a limited resource. Conserving water helps meet the needs of both present and future generations.

Methods of Water Conservation

• Rainwater harvesting.
• Repair leaking taps and pipelines.
• Reuse household water wherever possible.
• Avoid unnecessary wastage.
• Prevent water pollution.

Sun – The Ultimate Source of Energy

The Sun is the primary source of energy for almost every natural process on Earth. Green plants use sunlight to prepare food through photosynthesis. Solar energy is also used to produce electricity and heat water. Since sunlight is renewable and pollution-free, it is one of the best alternative sources of energy.

Uses of Solar Energy

• Solar cookers.
• Solar water heaters.
• Solar panels.
• Solar street lights.

Forests

Forests are one of the richest natural ecosystems on Earth. They provide habitat to numerous plants and animals while supplying oxygen, food, medicines, timber, fibres, and fuel. Forests also regulate climate, conserve biodiversity, and maintain ecological balance.

Importance of Forests

• Release oxygen.
• Absorb carbon dioxide.
• Provide habitat for wildlife.
• Prevent soil erosion.
• Maintain rainfall and climate.
• Provide medicinal plants and timber.

Forest Conservation

Large-scale cutting of forests leads to deforestation, which causes habitat destruction, climate change, and loss of biodiversity. Forest conservation is necessary to protect wildlife and maintain ecological balance.

Ways to Conserve Forests

• Afforestation.
• Prevent illegal cutting of trees.
• Control forest fires.
• Promote social forestry.
• Reduce excessive use of wood.

Soil

Soil is formed through the weathering of rocks over thousands of years. It contains minerals, organic matter, water, air, and microorganisms. Healthy soil supports agriculture and provides nutrients required for plant growth.

Importance of Soil

• Supports plant growth.
• Stores water.
• Provides habitat for microorganisms.
• Forms the basis of agriculture.

Rocks and Minerals

Rocks are naturally occurring solid materials made up of one or more minerals. Minerals are valuable substances used for manufacturing tools, machines, electrical equipment, jewellery, vehicles, and buildings.

Mineral	Common Uses
Iron	Machines, bridges, vehicles.
Copper	Electrical wires and electronics.
Aluminium	Aircraft, utensils, packaging.
Gold	Jewellery and electronics.

Fossil Fuels

Coal, petroleum, and natural gas are fossil fuels formed from the remains of ancient plants and animals over millions of years. They are widely used as sources of energy but are limited in quantity and produce pollution when burned.

Uses of Fossil Fuels

• Transportation.
• Electricity generation.
• Industrial production.
• Cooking fuel.

Disadvantages

• Cause air pollution.
• Increase global warming.
• Cannot be replaced quickly.

Renewable and Non-renewable Resources

Natural resources are classified according to their availability and ability to be replaced naturally.

Renewable Resources	Non-renewable Resources
Can be replenished naturally.	Cannot be replaced within a short period.
Environment friendly.	Limited in quantity.
Examples: Sunlight, Wind, Water.	Examples: Coal, Petroleum, Natural Gas.

Conservation of Natural Resources

Conservation means using natural resources carefully so that they remain available for future generations. Responsible use of resources helps reduce pollution, conserve biodiversity, and promote sustainable development.

Methods of Conservation

• Reduce unnecessary consumption.
• Reuse materials whenever possible.
• Recycle waste products.
• Use renewable sources of energy.
• Plant more trees.
• Save electricity and water.
• Protect wildlife and forests.

Importance of Natural Resources

Natural resources are essential for maintaining life on Earth. They provide food, shelter, clothing, medicines, fuel, and raw materials for industries. Without natural resources, survival of living organisms would not be possible.

Remember These Points

Revise these important points before examinations.

• Natural resources are gifts of nature.
• Air contains about 78% nitrogen and 21% oxygen.
• The Sun is the ultimate source of energy.
• Freshwater should be conserved.
• Forests maintain biodiversity and ecological balance.
• Soil is essential for agriculture.
• Rocks are made up of minerals.
• Coal, petroleum, and natural gas are fossil fuels.
• Renewable resources can be replenished naturally.
• Non-renewable resources should be used carefully.
• Reduce, Reuse, and Recycle help conserve natural resources.
• Every individual has a responsibility to protect nature's treasures.

Chapter Summary

Nature provides valuable resources such as air, water, sunlight, forests, soil, rocks, minerals, and fossil fuels that support life on Earth. These resources should be used responsibly because many of them are limited. Conservation through afforestation, rainwater harvesting, recycling, and the use of renewable energy helps protect the environment and ensures that future generations can also benefit from nature's treasures.

Chapter 11. Nature`s Treasures

Chapter 11. Nature's Treasures

This assignment is prepared according to the latest NCERT Curiosity textbook and the CBSE competency-based pattern. It includes objective, subjective, competency-based, case study, and HOTS questions to help students revise the complete chapter effectively.

Assignments – What Have You Learned?

Attempt all the following questions without referring to the textbook. These questions will strengthen your conceptual understanding and improve your examination skills.

Part A: Fill in the Blanks

Complete the following statements using suitable words.

1. Resources obtained directly from nature are called __________ resources.
2. __________ gas is essential for respiration.
3. The ultimate source of energy on Earth is the __________.
4. Coal, petroleum, and natural gas are called __________ fuels.
5. Collecting and storing rainwater is known as __________ harvesting.
6. __________ helps plants prepare food.
7. Large-scale cutting of forests is called __________.
8. The variety of living organisms is known as __________.
9. Resources that can be replenished naturally are called __________ resources.
10. Reduce, Reuse, and __________ help conserve natural resources.

Part B: True or False

Write True or False for each statement.

1. Air is a renewable natural resource.
2. Petroleum is a renewable source of energy.
3. Forests help prevent soil erosion.
4. Water is not required for agriculture.
5. Minerals are obtained from rocks.
6. Rainwater harvesting helps conserve water.
7. The Sun is the ultimate source of energy.
8. Fossil fuels take millions of years to form.
9. Every citizen should help conserve natural resources.
10. Afforestation means planting more trees.

Part C: Match the Following

Match Column A with the correct option in Column B.

Column A	Column B
1. Rainwater Harvesting	(a) Coal
2. Fossil Fuel	(b) Planting trees
3. Afforestation	(c) Collecting rainwater
4. Forest	(d) Habitat of wildlife
5. Solar Energy	(e) Renewable source of energy

Part D: One Word Answer

Answer each question in one word or one term.

1. Name the gas required for respiration.
2. Which natural resource supports plant growth?
3. Name one fossil fuel.
4. What is the process of planting new trees called?
5. Name one renewable source of energy.

Part E: Very Short Answer Questions

Answer the following questions in one or two sentences.

1. What is a natural resource?
2. Why should we conserve water?
3. What is biodiversity?
4. Why are forests important?
5. What is rainwater harvesting?

Part F: Short Answer Questions

Answer the following questions in about 30–50 words.

1. Differentiate between renewable and non-renewable resources.
2. Explain any three methods of conserving water.
3. Why are forests called the lungs of the Earth?
4. Write any three uses of rocks and minerals.
5. Why should fossil fuels be used carefully?

Part G: Long Answer Questions

Answer the following questions in detail.

1. Explain the importance of natural resources in our daily life.
2. Describe the importance of forests and suggest measures for their conservation.
3. Explain the differences between renewable and non-renewable resources with suitable examples.
4. Discuss the importance of conserving natural resources for sustainable development.
5. Describe how every individual can help protect nature's treasures.

Part H: Case Study

A village faced a shortage of water during summer. The villagers decided to build rainwater harvesting structures, repair leaking pipelines, plant more trees, and avoid wasting water. Within a few years, the groundwater level improved, and enough water became available for farming and daily use.

Answer the following questions.

1. Which method helped collect rainwater?
2. Why did the villagers plant more trees?
3. How did repairing leaking pipelines help?
4. What happened to the groundwater level after adopting these measures?
5. What lesson do you learn from this case study?

Part I: Competency-Based Questions

Answer the following questions by applying your understanding of the chapter.

1. Why should schools encourage students to plant trees every year?
2. How can your family reduce the use of fossil fuels at home?
3. Suppose water is continuously wasted in your neighbourhood. What practical steps would you suggest?
4. Why is solar energy considered better than coal for the future?
5. How does protecting forests help both humans and wildlife?

Part J: HOTS (Higher Order Thinking Skills)

Think carefully and answer the following questions.

1. What would happen if all forests disappeared from the Earth?
2. How would life change if freshwater became extremely scarce?
3. Why should renewable energy sources gradually replace fossil fuels?
4. How can small daily habits help conserve natural resources on a large scale?
5. If you were the Environment Minister of your state, which three steps would you take to protect nature's treasures? Give reasons.

Self-Assessment Checklist

Tick (✔) the statements after completing this chapter.

• ☐ I can explain the meaning of natural resources.
• ☐ I can classify renewable and non-renewable resources.
• ☐ I understand the importance of air, water, forests, soil, and sunlight.
• ☐ I know how rainwater harvesting helps conserve water.
• ☐ I can explain why fossil fuels should be used carefully.
• ☐ I can solve competency-based and case study questions.
• ☐ I am confident about this chapter for my CBSE examination.