Important Questions Class 6 Science Chapter 11: Nature’s Treasures

Natural resources are materials and energy sources that humans and other living beings get from nature. Air, water, sunlight, forests, soil, rocks, minerals and fossil fuels support life and daily activities on Earth.

Nature gives us resources that make life possible, including air, water, sunlight, forests, soil, rocks, minerals and fossil fuels. Important Questions Class 6 Science Chapter 11 help students understand natural resources, renewable and non-renewable resources, air composition, oxygen, wind energy, water conservation, rainwater harvesting, solar energy, forests, soil formation, rocks, minerals and fossil fuels. The CBSE 2026 chapter explains these ideas through Bhoomi, Surya and Ajji’s visit to a village near the Western Ghats.

Key Takeaways

• Air Composition: Air contains about 78% nitrogen, 21% oxygen and 1% other gases.
• Water Conservation: Freshwater is limited, so water harvesting and reduced wastage are important.
• Solar Energy: The Sun is the main source of energy for life on Earth.
• Fossil Fuels: Coal, petroleum and natural gas take millions of years to form.

Important Questions Class 6 Science Chapter 11 Structure 2026

Important Questions Class 6 Science Chapter 11 with Answers

Nature’s Treasures explains the resources that support survival and comfort.
Students should connect every answer with air, water, sunlight, forests, soil, rocks, minerals or fuels.
These nature’s treasures class 6 questions follow the NCERT 2026 chapter flow.

1. What does Important Questions Class 6 Science Chapter 11 mainly teach?

Important Questions Class 6 Science Chapter 11 mainly teach natural resources, air, water, solar energy, forests, soil, minerals, fossil fuels and conservation. The chapter explains why resources must be used responsibly.

1. Survival Resources: Air, water and food.
2. Comfort Resources: Fuel, minerals and wood.
3. Energy Source: Sun and wind.
4. Key Action: Conserve natural resources.
5. Final Result: Chapter 11 teaches responsible use of nature’s treasures.

2. What is the name of Class 6 Science Chapter 11?

The name of Class 6 Science Chapter 11 is Nature’s Treasures. It describes useful resources provided by nature.

1. Chapter Number: 11.
2. Chapter Name: Nature’s Treasures.
3. Textbook: Curiosity.
4. Final Result: Chapter 11 is about nature’s useful resources.

3. Why are natural resources called nature’s treasures?

Natural resources are called nature’s treasures because they enrich life and support survival. Air, water, soil, forests and sunlight make life possible.

1. Air: Helps breathing.
2. Water: Supports drinking, farming and cleaning.
3. Sunlight: Gives heat and light.
4. Final Result: Nature’s treasures are essential for life on Earth.

Class 6 Science Chapter 11 Important Questions

Class 6 Science Chapter 11 important questions focus on resources and conservation.
The chapter explains how humans depend on nature for survival and daily comfort.
It also shows how careless use can cause pollution and shortage.

4. What are natural resources?

Natural resources are resources that we get from nature. They include air, water, sunlight, forests, soil, rocks, minerals and fossil fuels.

1. Provided By: Nature.
2. Used For: Survival and comfort.
3. Examples: Air, water and forests.
4. Final Result: Natural resources come from nature.

5. What are human-made resources?

Human-made resources are useful things created by humans from natural resources. Examples include furniture, bicycles, electric bulbs and solar panels.

1. Source: Made from natural resources.
2. Created By: Human beings.
3. Examples: Bulbs, furniture and vehicles.
4. Final Result: Human-made resources are created for human use.

6. Why should natural resources be used judiciously?

Natural resources should be used judiciously because life depends on them. Some resources are limited and take very long to form again.

1. Freshwater: Limited and precious.
2. Forests: Take many years to regrow.
3. Fossil Fuels: Take millions of years to form.
4. Final Result: Judicious use prevents shortage and damage.

7. What is one important message of Chapter 11?

The important message is that humans must conserve natural resources. We should meet present needs without harming the environment.

1. Present Need: Use resources carefully.
2. Future Need: Save resources for later.
3. Environment: Avoid pollution and wastage.
4. Final Result: Resource conservation protects life and environment.

Natural Resources Class 6 Questions

Natural resources class 6 questions help students identify resources used in daily life.
The chapter gives examples from villages, forests, homes, farms and vehicles.
Natural resources can be renewable or non-renewable.

8. Give five examples of natural resources.

Five examples of natural resources are air, water, sunlight, forests and soil. Rocks, minerals and fossil fuels are also natural resources.

1. Air: Used for breathing.
2. Water: Used for drinking and farming.
3. Sunlight: Gives heat and light.
4. Forests: Give food, shelter and wood.
5. Soil: Supports plant growth.
6. Final Result: Natural resources support daily life.

9. How do natural resources fulfil human needs?

Natural resources fulfil human needs by providing air, water, food, materials and energy. They also help humans make useful objects.

1. Air: Needed for survival.
2. Water: Needed for drinking and cleaning.
3. Minerals: Used in machines and electronics.
4. Final Result: Natural resources meet survival and comfort needs.

10. How are natural resources used in daily activities?

Natural resources are used in washing, cooking, travelling, farming, studying and building. Many activities use more than one resource.

1. Washing Clothes: Water.
2. Cooking Food: LPG or natural gas.
3. Making Clay Toys: Soil.
4. Travelling: Petrol, diesel or electricity.
5. Final Result: Daily life depends on many natural resources.

11. Why are air and water essential resources?

Air and water are essential because most living beings need oxygen and water for survival. Without them, life cannot continue.

1. Air: Contains oxygen.
2. Water: Needed by humans, animals and plants.
3. Survival: Both are basic needs.
4. Final Result: Air and water support life directly.

12. Why should resources be saved for the future?

Resources should be saved because future generations will also need them. Overuse can cause shortage, pollution and environmental harm.

1. Overuse: Reduces availability.
2. Pollution: Makes resources unsafe.
3. Future Need: Children and animals will need resources.
4. Final Result: Saving resources protects future life.

Air Class 6 Science Questions

Air class 6 science questions explain why air is necessary for life.
The chapter connects breathing, oxygen, wind and windmills with air.
It also introduces the composition of air through percentages.

13. Why do living beings need air?

Living beings need air because it contains oxygen. Oxygen helps the body perform its functions.

1. Breathing: We take air into the lungs.
2. Oxygen: Needed by the body.
3. Survival: Most living beings need oxygen.
4. Final Result: Air is essential because it provides oxygen.

14. Why can we not hold our breath for a long time?

We cannot hold our breath for a long time because the body does not get enough oxygen. This makes us feel uncomfortable.

1. Breath Holding: Stops fresh air intake.
2. Oxygen Supply: Becomes low.
3. Body Need: Oxygen is needed continuously.
4. Final Result: Lack of oxygen makes breath holding difficult.

15. What is moving air called?

Moving air is called wind. It may blow gently as a breeze or strongly during a storm.

1. Gentle Wind: Breeze.
2. Fast Wind: Storm.
3. Visible Effect: Leaves rustle and clothes sway.
4. Final Result: Moving air is wind.

16. How do we notice the presence of air?

We notice air when leaves rustle, clothes sway or pages flutter under a fan. These movements show air around us.

1. Tree Leaves: Rustle in wind.
2. Clothes: Sway on a line.
3. Book Pages: Flutter when fan starts.
4. Final Result: Air becomes visible through its effects.

17. How does wind make a firki rotate?

Wind makes a firki rotate by pushing its folded paper blades. Moving air transfers energy to the firki.

1. Air Movement: Wind strikes the firki.
2. Blade Shape: Helps rotation.
3. Result: Firki spins.
4. Final Result: Wind energy rotates a firki.

18. What are windmills used for?

Windmills are used to run flour mills, pull water from wells and generate electricity. Wind rotates their wings.

1. Flour Mill: Grinding grains.
2. Water Pumping: Pulling water from wells.
3. Electricity: Windmill farms generate power.
4. Final Result: Windmills use wind energy for useful work.

Composition of Air Class 6 Questions

Composition of air class 6 questions cover the gases present in air.
The chapter explains air as a mixture of nitrogen, oxygen, argon, carbon dioxide and other gases.
It also introduces percentage as parts out of 100.

19. What is air made of?

Air is a mixture of gases. It mainly contains nitrogen and oxygen, with small amounts of argon, carbon dioxide and other gases.

1. Major Gas: Nitrogen.
2. Second Major Gas: Oxygen.
3. Minor Gases: Argon, carbon dioxide and others.
4. Final Result: Air is a mixture of gases.

20. What is the percentage of nitrogen in air?

Air contains about 78% nitrogen. This means 78 out of 100 parts of air are nitrogen.

1. Nitrogen: 78%.
2. Meaning: 78 parts in 100.
3. Largest Component: Nitrogen.
4. Final Result: Nitrogen forms the largest part of air.

21. What is the percentage of oxygen in air?

Air contains about 21% oxygen. Oxygen is the gas needed by most living beings for survival.

1. Oxygen: 21%.
2. Meaning: 21 parts in 100.
3. Use: Supports breathing.
4. Final Result: Oxygen forms about one-fifth of air.

22. What makes up the remaining 1% of air?

The remaining 1% of air includes argon, carbon dioxide and other gases. These gases are present in small quantities.

1. Argon: Present in small amount.
2. Carbon Dioxide: Present in small amount.
3. Other Gases: Present in traces.
4. Final Result: Minor gases make about 1% of air.

23. What does percentage mean?

Percentage means the number of parts in 100. The symbol for percentage is %.

1. Meaning: Parts per 100.
2. Symbol: %.
3. Example: 21% means 21 parts in 100.
4. Final Result: Percentage expresses a value out of 100.

Water Conservation Class 6 Questions

Water conservation class 6 questions focus on saving freshwater.
The chapter explains that most water on Earth is salty and not fit for common use.
Freshwater is limited and must be used carefully.

24. Why is water important?

Water is important because living beings need it for survival and daily activities. Humans use it for drinking, cooking, bathing, washing and cleaning.

1. Drinking: Basic need.
2. Cooking: Needed for food.
3. Farming: Needed for crops.
4. Cleaning: Used in homes.
5. Final Result: Water supports life and daily work.

25. Why is most water on Earth not fit for domestic use?

Most water is not fit for domestic use because it is saline or salty. Oceans and seas contain most of Earth’s water.

1. Oceans: Contain salty water.
2. Seas: Contain salty water.
3. Domestic Use: Needs freshwater.
4. Final Result: Saline water is not fit for drinking or farming.

26. Where is freshwater found?

Freshwater is found in ice sheets, snow, rivers, lakes, ponds, wells and underground sources. Only a small fraction is easily accessible.

1. Surface Sources: Rivers, lakes and ponds.
2. Frozen Sources: Ice sheets and snow.
3. Underground Source: Groundwater.
4. Final Result: Accessible freshwater is limited.

27. Why should water wastage be reduced?

Water wastage should be reduced because freshwater is limited. Many places face water shortage.

1. Limited Resource: Freshwater is small in amount.
2. Shortage: Some people walk far for drinking water.
3. Conservation: Helps all living beings.
4. Final Result: Reducing wastage protects freshwater.

28. Give two ways to reduce water wastage.

Two ways to reduce water wastage are turning off taps when not in use and fixing leakages. Reusing water also helps.

1. Tap Use: Close taps while brushing.
2. Leakage: Repair leaking taps.
3. Reuse: Use leftover water for plants.
4. Final Result: Small actions save water daily.

29. How does water pollution happen?

Water pollution happens when trash, household waste or industrial waste enters water sources. Polluted water becomes unfit for living beings.

1. Trash: Plastic bags and wrappers.
2. Home Waste: Wastewater from homes.
3. Industrial Waste: Waste dumped into water.
4. Final Result: Pollution makes water unsafe.

Rainwater Harvesting Class 6 Questions

Rainwater harvesting class 6 questions explain how rainwater can be collected and stored.
The chapter also mentions stepwells as an age-old Indian practice.
Rainwater harvesting helps conserve freshwater.

30. What is rainwater harvesting?

Rainwater harvesting is the collection and storage of rainwater for later use. It helps conserve water.

1. Rainwater: Collected from roofs or open areas.
2. Storage: Stored in tanks or underground structures.
3. Use: Used later when needed.
4. Final Result: Rainwater harvesting saves rainwater.

31. Why is rainwater harvesting important?

Rainwater harvesting is important because freshwater is limited. Stored rainwater can help during water shortage.

1. Freshwater: Limited and precious.
2. Rain: Seasonal in many places.
3. Storage: Makes water available later.
4. Final Result: Rainwater harvesting reduces water scarcity.

32. What are stepwells?

Stepwells are traditional water harvesting structures with steps leading down to stored water. They are called Bawadi in Rajasthan and Vav in Gujarat.

1. Rajasthan Name: Bawadi.
2. Gujarat Name: Vav.
3. Purpose: Store water.
4. Final Result: Stepwells are traditional water storage systems.

33. How do stepwells collect water?

Stepwells collect rainwater and water seeping from nearby lakes, ponds and rivers. Stone-lined trenches allow water seepage.

1. Rainwater: Stored in the structure.
2. Seepage: Comes from nearby water bodies.
3. Stone Blocks: Allow water to enter.
4. Final Result: Stepwells store rainwater and seepage water.

34. What is World Water Day?

World Water Day is observed on 22 March every year. It highlights the importance of freshwater.

1. Date: 22 March.
2. Theme: Water awareness.
3. Purpose: Encourage conservation.
4. Final Result: World Water Day promotes water awareness.

Solar Energy Class 6 Questions

Solar energy class 6 questions show how the Sun supports life and daily activities.
The chapter explains that the Sun is the main source of energy on Earth.
Plants, animals and humans depend on sunlight directly or indirectly.

35. Why is the Sun called the main source of energy on Earth?

The Sun is called the main source of energy because plants use sunlight to prepare food. Animals and humans depend on plants directly or indirectly.

1. Plants: Use sunlight to make food.
2. Animals: Eat plants or plant-eating animals.
3. Humans: Get food from plants and animals.
4. Final Result: Food energy begins with the Sun.

36. What are common uses of heat and light from the Sun?

Heat and light from the Sun are used for drying clothes, drying chillies, warming Earth and helping plants grow. Solar devices also use sunlight.

1. Drying: Clothes and food items.
2. Plants: Make food using sunlight.
3. Devices: Solar panels and solar cookers.
4. Final Result: Sunlight supports natural and human activities.

37. How do solar panels help us?

Solar panels capture the Sun’s energy and produce electricity. They are used on rooftops, street lights and traffic signals.

1. Source: Sunlight.
2. Device: Solar panel.
3. Output: Electricity.
4. Final Result: Solar panels convert solar energy into electricity.

38. What is a solar cooker?

A solar cooker is a device that uses sunlight for cooking food. It uses heat from the Sun.

1. Energy Source: Sun.
2. Use: Cooking food.
3. Benefit: Saves fuel.
4. Final Result: Solar cooker uses solar heat for cooking.

39. How does a cow get energy from the Sun indirectly?

A cow gets energy from the Sun indirectly by eating grass. Grass uses sunlight to grow and make food.

1. Sunlight: Helps grass grow.
2. Grass: Makes food.
3. Cow: Eats grass.
4. Final Result: The cow’s food energy comes from the Sun.

40. What may happen if the Sun is not visible for a few days?

If the Sun is not visible for a few days, we may need artificial lighting during daytime. Drying clothes and food items may also become difficult.

1. Light: Daytime becomes dull.
2. Drying: Clothes dry slowly.
3. Plants: Receive less sunlight.
4. Final Result: Sunlight affects daily life and plant growth.

Forests Class 6 Science Questions

Forests class 6 science questions explain the value of dense plant areas.
The chapter describes forests as homes for animals, birds and insects.
Forests also protect soil and support biodiversity.

41. What is a forest?

A forest is a large area with dense growth of various types of plants. It includes herbs, shrubs and trees.

1. Area: Large land region.
2. Plants: Herbs, shrubs and trees.
3. Density: Thick growth.
4. Final Result: A forest is a dense plant-covered area.

42. Why are forests important for animals?

Forests are important because they provide food and shelter to many animals, birds and insects. They form natural homes for wildlife.

1. Food: Fruits, leaves and seeds.
2. Shelter: Trees and bushes.
3. Biodiversity: Many life forms live there.
4. Final Result: Forests support wildlife survival.

43. Why should forests be used responsibly?

Forests should be used responsibly because they take many years to grow again. Large-scale cutting reduces forest cover.

1. Tree Growth: Takes years.
2. Forest Loss: Affects animals and soil.
3. Regeneration: Needs time.
4. Final Result: Forests need time to recover.

44. What is Van Mahotsav?

Van Mahotsav is a weeklong forest festival celebrated in July. During this event, new trees are planted.

1. Time: July.
2. Activity: Tree plantation.
3. Aim: Increase green cover.
4. Final Result: Van Mahotsav promotes tree planting.

45. What was the Chipko movement?

The Chipko movement was a people’s effort to protect trees from being cut. It began in the early 1970s in Uttarakhand.

1. Place: Uttarakhand.
2. Time: Early 1970s.
3. Action: People hugged trees.
4. Final Result: Chipko movement protected forests from felling.

46. How do forests protect soil?

Forests protect soil because plant roots hold the soil. Fallen leaves decay and add nutrients to the soil.

1. Roots: Prevent soil from washing away.
2. Leaves: Decay into nutrients.
3. New Plants: Use enriched soil.
4. Final Result: Forests prevent soil erosion and enrich soil.

Soil Rocks and Minerals Class 6 Questions

Soil rocks and minerals class 6 questions cover the materials found under and around us.
The chapter explains soil formation, rock uses and minerals in daily products.
It also shows that soil and rocks take a very long time to form.

47. What is soil made of?

Soil contains sand, small stones, insects, worms, roots, decayed plants and decayed animals. It may also contain tiny organisms.

1. Particles: Sand and pebbles.
2. Living Things: Insects and worms.
3. Dead Matter: Decayed plants and animals.
4. Final Result: Soil contains living and non-living materials.

48. How is soil formed?

Soil is formed by the breaking apart of rocks over a long time. Sun, water and living organisms help this process.

1. Starting Material: Rocks.
2. Process: Disintegration.
3. Time Taken: Thousands of years.
4. Final Result: Soil forms slowly from rocks.

49. Why are earthworms useful for soil?

Earthworms are useful because they help turn and loosen the soil. Loose soil supports root growth and air spaces.

1. Turning: Mixes soil.
2. Loosening: Creates spaces.
3. Plant Growth: Roots grow easily.
4. Final Result: Earthworms are natural soil helpers.

50. What are rocks used for?

Rocks are used for houses, buildings, temples, roads, dams, table tops and roofing. Humans also used rocks for ancient tools.

1. Construction: Buildings and roads.
2. Roofing: Slate.
3. Tools: Hand axes and arrowheads.
4. Final Result: Rocks have many practical uses.

51. What are rocks made of?

Rocks are made of minerals. Important metals such as aluminium, gold, copper and iron are extracted from minerals.

1. Rocks: Made of minerals.
2. Minerals: Contain useful materials.
3. Metals: Extracted from minerals.
4. Final Result: Minerals are the building materials of rocks.

52. Why should rocks and minerals be conserved?

Rocks and minerals should be conserved because they take thousands to millions of years to form. They are used in many important products.

1. Formation Time: Very long.
2. Uses: Buildings, vehicles and electronics.
3. Limited Supply: Not quickly replaced.
4. Final Result: Rocks and minerals must be used responsibly.

Fossil Fuels Class 6 Questions

Fossil fuels class 6 questions explain petrol, diesel, kerosene, coal and natural gas.
The chapter describes their formation from remains buried deep inside Earth.
It also highlights pollution and the need for alternatives.

53. What are fossil fuels?

Fossil fuels are fuels formed from remains of microorganisms and plants buried deep inside Earth. Coal, petroleum and natural gas are fossil fuels.

1. Examples: Coal, petroleum and natural gas.
2. Formation: From buried remains.
3. Time Taken: Millions of years.
4. Final Result: Fossil fuels are ancient natural fuels.

54. What fuels are obtained from petroleum?

Petrol, diesel and kerosene are obtained from petroleum. Petrol and diesel are widely used in vehicles.

1. Petrol: Used in many two-wheelers.
2. Diesel: Used in many heavy vehicles.
3. Kerosene: Used as a fuel.
4. Final Result: Petroleum gives petrol, diesel and kerosene.

55. What is natural gas used for?

Natural gas is used for cooking and generating electricity. It is also used as CNG in vehicles.

1. Cooking: Domestic fuel.
2. Electricity: Power generation.
3. Vehicles: CNG fuel.
4. Final Result: Natural gas is a useful cleaner fuel.

56. Why is CNG called a cleaner fuel?

CNG is called a cleaner fuel because it causes less pollution than petrol or diesel. It is used in vehicles.

1. Full Form: Compressed Natural Gas.
2. Use: Vehicle fuel.
3. Pollution: Less than petrol and diesel.
4. Final Result: CNG is cleaner than petrol and diesel.

57. Why should fossil fuels be conserved?

Fossil fuels should be conserved because they are limited and take millions of years to form. Burning them also causes air pollution.

1. Limited Quantity: They can run out.
2. Long Formation: Millions of years.
3. Pollution: Smoke and carbon dioxide.
4. Final Result: Fossil fuels must be used carefully.

58. How can students help conserve fossil fuels?

Students can conserve fossil fuels by walking, cycling, using public transport and avoiding unnecessary vehicle use. These actions reduce fuel consumption.

1. Nearby Places: Walk or cycle.
2. Longer Travel: Use public transport.
3. Vehicle Use: Avoid wasteful trips.
4. Final Result: Reduced fuel use conserves fossil fuels.

Renewable Resources Class 6 Questions

Renewable resources class 6 questions explain resources that get replenished naturally.
The chapter gives air, water and forests as examples.
Renewable resources still need careful use.

59. What are renewable resources?

Renewable resources are resources that get renewed, replenished or restored by natural processes within a reasonable time. Air, water and forests are examples.

1. Renewed By: Natural processes.
2. Time: Reasonable period.
3. Examples: Air, water and forests.
4. Final Result: Renewable resources can be restored naturally.

60. Are forests renewable resources?

Yes, forests are renewable resources because new trees can grow naturally or through planting. However, forests take many years to regenerate.

1. New Trees: Grow from seeds.
2. Birds and Animals: Help spread seeds.
3. Time: Regrowth takes years.
4. Final Result: Forests are renewable but need protection.

61. Why should renewable resources not be wasted?

Renewable resources should not be wasted because renewal takes time and pollution can damage them. Water and forests can become scarce or degraded.

1. Water: Can become polluted.
2. Forests: Can be cut faster than they regrow.
3. Air: Can become polluted.
4. Final Result: Renewable resources also need responsible use.

Non-Renewable Resources Class 6 Questions

Non-renewable resources class 6 questions explain resources that do not form again quickly.
The chapter includes minerals, soil, rocks, coal, petroleum and natural gas in this group.
These resources must be conserved carefully.

62. What are non-renewable resources?

Non-renewable resources are resources that are limited and do not get replenished in a reasonable time. Coal, petroleum, minerals, rocks and soil are examples.

1. Supply: Limited.
2. Renewal: Very slow.
3. Examples: Coal, petroleum and minerals.
4. Final Result: Non-renewable resources can get exhausted.

63. Why is petroleum a non-renewable resource?

Petroleum is non-renewable because it takes millions of years to form. It is also found in limited quantities.

1. Formation: From buried remains.
2. Time: Millions of years.
3. Use: Petrol, diesel and kerosene.
4. Final Result: Petroleum cannot be replaced quickly.

64. Why are minerals non-renewable resources?

Minerals are non-renewable because they form over very long periods and are available in limited amounts. Once extracted, they cannot be quickly replaced.

1. Formation Time: Very long.
2. Availability: Limited deposits.
3. Use: Metals, machines and electronics.
4. Final Result: Minerals are limited natural resources.

65. Classify coal, natural gas, forests and minerals.

Coal, natural gas and minerals are non-renewable resources, while forests are renewable resources. Forests can regrow if protected.

1. Coal: Non-renewable.
2. Natural Gas: Non-renewable.
3. Minerals: Non-renewable.
4. Forests: Renewable.
5. Final Result: The classification depends on renewal time.

NCERT Class 6 Science Chapter 11 Questions

NCERT Class 6 Science Chapter 11 questions ask students to classify resources and suggest conservation actions.
Students should answer with examples from air, water, forests, fossil fuels and daily life.
These NCERT Class 6 Science Chapter 11 questions follow the exercise pattern.

66. State whether nature has resources to meet human needs.

Nature has resources to meet human needs. It does not have enough for unlimited greed and waste.

1. Need: Basic survival and comfort.
2. Greed: Excessive use.
3. Gandhi Quote: Earth satisfies need, not greed.
4. Final Result: Nature’s resources must be used responsibly.

67. Are machines natural resources?

No, machines are not natural resources. Machines are human-made resources created using natural resources.

1. Machine: Made by humans.
2. Materials: Come from nature.
3. Category: Human-made resource.
4. Final Result: Machines are human-made resources.

68. Is air a renewable resource?

Yes, air is a renewable resource. Natural processes help maintain air in the atmosphere.

1. Resource: Air.
2. Category: Renewable.
3. Need: Breathing and wind energy.
4. Final Result: Air is a renewable natural resource.

69. Which fuel is commonly used in two-wheelers?

Petrol is commonly used in two-wheelers like scooters and bikes. It is obtained from petroleum.

1. Vehicle: Scooter or bike.
2. Fuel: Petrol.
3. Source: Petroleum.
4. Final Result: Two-wheelers commonly use petrol.

70. Why is it difficult to regrow forests?

It is difficult to regrow forests because trees take many years to grow. A forest also needs many living beings and soil conditions to recover.

1. Trees: Grow slowly.
2. Animals: Depend on forest.
3. Soil: Needs protection and nutrients.
4. Final Result: Forest restoration takes many years.

71. How does cutting trees affect soil quality?

Cutting trees affects soil quality because roots no longer hold soil firmly. Fallen leaves also stop adding nutrients to soil.

1. Roots Removed: Soil washes away easily.
2. Leaf Litter Reduced: Nutrient recycling decreases.
3. Erosion: Soil becomes weaker.
4. Final Result: Tree cutting causes soil loss and poor soil quality.

72. Give two ways human activities pollute air.

Human activities pollute air by burning fossil fuels in vehicles and using polluting fuels for domestic work. Smoke and gases enter the air.

1. Vehicles: Release smoke.
2. Fuels: Coal, petrol and diesel pollute air.
3. Effect: Air quality becomes poor.
4. Final Result: Burning fuels causes air pollution.

73. What happens if there is no sunlight for a week?

If there is no sunlight for a week, solar panels produce less electricity and clothes dry slowly. Plants also receive less light for making food.

1. Solar Panels: Lower output.
2. Drying: Clothes and food dry slowly.
3. Plants: Food-making reduces.
4. Final Result: Sunlight shortage affects energy and plant growth.

Class 6 Science Chapter 11 Questions and Answers

Class 6 Science Chapter 11 questions and answers should use direct examples from the chapter.
Students should mention conservation wherever resources are limited or polluted.
These answers support revision for short and long questions.

74. List four activities possible due to air.

Four activities possible due to air are breathing, flying kites, rotating firki and running windmills. Air also helps clothes sway on a line.

1. Breathing: Oxygen from air.
2. Firki: Rotates with wind.
3. Windmill: Uses wind energy.
4. Kite: Moves with air.
5. Final Result: Air supports breathing and movement-based activities.

75. How can students increase green cover in their locality?

Students can increase green cover by planting saplings, caring for trees and joining Van Mahotsav activities. They can also protect existing plants.

1. Plant Trees: In school or locality.
2. Water Plants: Regularly.
3. Protect Saplings: Prevent damage.
4. Final Result: Tree planting increases green cover.

76. What is one benefit and one drawback of cooking with firewood?

One benefit of firewood is that it can cook food without electricity. One drawback is that it produces smoke and causes air pollution.

1. Benefit: Useful for cooking.
2. Drawback: Produces smoke.
3. Health Effect: Smoke affects breathing.
4. Final Result: Firewood can cook food but pollutes air.

77. Propose one action to reduce air pollution.

One action to reduce air pollution is using public transport instead of private vehicles. This reduces fuel burning per person.

1. Action: Use bus or shared transport.
2. Fuel Use: Reduced.
3. Pollution: Less smoke released.
4. Final Result: Public transport helps reduce air pollution.

78. How can a school use less water?

A school can use less water by fixing leaks, closing taps, reusing water for plants and collecting rainwater. Student monitors can check wastage.

1. Fix Leaks: Stop continuous loss.
2. Close Taps: Avoid running water.
3. Reuse Water: Water gardens.
4. Harvest Rainwater: Store rain.
5. Final Result: A school water plan reduces wastage.

Class 6 Science Important Links