Why is it difficult to hold your breath for a long time?

The body does not get enough oxygen to perform its functions.

The body needs carbon dioxide to function.

The body does not get enough oxygen to perform its functions.

The lungs get tired from holding air.

The air becomes too warm inside the body.

Which of the following activities requires freshwater?

Generating electricity in a tidal power plant

How do solar panels contribute to energy production?

They capture the Sun's energy and produce electricity.

They generate heat for cooking.

They capture the Sun's energy and produce electricity.

They store wind energy for later use.

They purify water using sunlight.

Why is it important to use fossil fuels responsibly?

They are found in limited quantities and take millions of years to form.

They are renewable resources and will regenerate quickly.

They are found in limited quantities and take millions of years to form.

Burning them produces oxygen, which is harmful.

They are very expensive to extract.

What is the primary function of the structure shown in the image, which is a traditional stepwell?

To provide access to groundwater and store water

To serve as a place for religious ceremonies only

Assertion (A): It is difficult to hold our breath for a long time. Reason (R): Our body needs oxygen to perform its functions, and holding breath stops its supply.

A and R both correct, R explains A

Assertion (A): Water is a precious resource. Reason (R): Most of the water on Earth is saline and not fit for domestic, agricultural, and industrial use.

A and R both correct, R explains A

Assertion (A): Fossil fuels are non-renewable resources. Reason (R): They are formed from the remains of microorganisms and plants over millions of years and are found in limited quantities.

A and R both correct, R explains A

A city is planning to implement sustainable practices. They are considering replacing traditional streetlights with solar-powered ones and encouraging rainwater harvesting in all new buildings. They also want to reduce air pollution caused by vehicles. Which of the following actions would best address the air pollution concern, based on the chapter's information?

Promoting the use of electric vehicles that do not release smoke.

Increasing the number of public parks and green spaces.

Promoting the use of electric vehicles that do not release smoke.

Building more solar power plants outside the city.

Implementing stricter regulations on industrial waste disposal.

A farmer observes that the soil in his field has become less fertile over time. He recalls that healthy soil provides sufficient air and space for roots. He also knows that soil is formed from rocks. Which of the following practices would NOT directly help in improving the soil's ability to support plant growth by maintaining its structure and air content?

Using heavy machinery that compacts the soil.

Ploughing the field regularly to loosen the soil.

Adding organic matter like compost to the soil.

Using heavy machinery that compacts the soil.

Ensuring proper drainage to prevent waterlogging.

Which of the following statements are true regarding the Sun as a natural resource?

The Sun is the main source of energy on Earth.

Sunlight helps plants prepare food.

Solar panels convert the Sun's heat into electricity.

The Sun's energy is a non-renewable resource.

Is this Class 6 Science Chapter 11 quiz free?

Yes, this quiz on 'Nature’s Treasures' for CBSE Class 6 Science is completely free to use, with no hidden costs or sign-ups required.

Is this quiz based on the NCERT syllabus?

Absolutely! All questions in this quiz are carefully designed and aligned with the latest NCERT syllabus for CBSE Class 6 Science, Chapter 11.

How many questions are in the game mode?

The game mode features a total of 40 questions, divided into easy, medium, and hard difficulty levels to provide a comprehensive learning experience.

Can I access this quiz offline?

Currently, the quiz requires an internet connection to play. We are working on an offline mode for future updates.

What topics does this quiz cover?

This quiz covers all major topics from Chapter 11, 'Nature’s Treasures', including air, water, energy from the Sun, forests, soil, rocks, minerals, and fossil fuels, along with renewable and non-renewable resources.

Are there explanations for the answers?

Yes, every question comes with a short explanation immediately after you answer, and a detailed explanation is available if you want to understand the concept better.

Home › CBSE › Class 6 › Science › Nature’s Treasures

CBSE · Class 6 · 🔬 Science · Chapter 11

Nature’s Treasures

Air composition and importanceWater resources and conservationSun as an energy sourceForests as natural habitatsSoil, rocks, and mineralsFossil fuels and their formation

Chapter 11, 'Nature’s Treasures', introduces students to the fundamental natural resources that sustain life on Earth. It covers the composition and importance of air, the uses and conservation of water, the Sun as the primary energy source, the significance of forests, the formation and utility of soil, rocks, and minerals, and the critical topic of fossil fuels. The chapter also distinguishes between renewable and non-renewable resources, emphasizing the need for responsible usage and conservation to protect our environment.

Air: Composition aur Importance

Air hamare charon taraf hai aur sabhi living beings ke liye bahut zaruri hai. Iski composition aur importance ko samajhna important hai.

Air ki Composition

Air gases ka mixture hai.
Main components:
Nitrogen (N₂): Approximately 78%. Plants ke growth ke liye essential hai (nitrogen fixation ke through).
Oxygen (O₂): Approximately 21%. Living beings ke respiration ke liye most essential gas.
Argon (Ar), Carbon Dioxide (CO₂), aur other gases: Approximately 1%. Carbon dioxide plants ke photosynthesis ke liye zaruri hai.

Air ki Importance

Respiration: Sabhi living organisms (humans, animals, plants) ko oxygen chahiye breathe karne ke liye.
Photosynthesis: Plants carbon dioxide use karte hain food banane ke liye.
Wind: Moving air ko wind kehte hain. Wind ke uses:
Windmills chalane mein (electricity generation).
Sailboats ko move karne mein.
Clothes dry karne mein.
Seeds aur pollen grains ko disperse karne mein.
Weather changes: Air currents weather patterns ko affect karte hain.

Air Pollution

Fossil fuels jalane se (vehicles, factories) air mein harmful gases aur particles release hote hain.
Isse air quality kharab hoti hai, jisse breathing problems aur environmental issues hote hain.
Solution: Public transport use karna, electric vehicles use karna, trees lagana.

❗Important

Moving air ko wind kehte hain. Wind bahut useful hai, jaise patang udana, clothes sukhana, aur windmills chalana.

💡Tip

Air ki composition (especially Nitrogen aur Oxygen ka percentage) yaad rakho. Yeh MCQs aur short answer questions mein aata hai.

Water: Importance aur Conservation

Water life ke liye essential hai. Iske bina koi bhi living organism survive nahi kar sakta.

Water ki Importance

Drinking: Humans aur animals ko pani peene ke liye chahiye.
Daily Activities: Cooking, bathing, washing clothes, cleaning ke liye.
Agriculture: Plants aur crops ko grow karne ke liye pani zaruri hai.
Industry: Factories mein production processes ke liye.
Habitat: Aquatic animals aur plants ka ghar.

Water Sources

Earth ka do-tihai hissa pani se cover hai.
Oceans aur Seas: Most of the water yahan hai, lekin yeh saline (namkeen) hota hai aur direct use ke liye fit nahi hai.
Freshwater Sources: Rivers, lakes, ponds, underground water, ice sheets aur glaciers. Yeh bahut kam quantity mein available hai.

Water Conservation

Freshwater ki scarcity ek major problem hai, isliye pani bachana bahut zaruri hai.

Reduce: Pani ka use kam karo.
Nahate waqt shower ki jagah bucket use karo.
Brushing karte waqt tap band rakho.
Reuse: Pani ko dobara use karo.
Sabzi dhone ka pani plants mein dal do.
Recycle: Wastewater ko treat karke dobara use karna (industries mein).
Rainwater Harvesting: Barish ke pani ko collect aur store karna future use ke liye. Yeh groundwater level badhane mein bhi help karta hai.
Method: Roof se pani collect karke storage tank mein jama karna ya seedha ground mein recharge karna.
Efficient Irrigation: Drip irrigation aur sprinkler systems use karna jisse pani waste na ho.

📖Definition

Rainwater Harvesting: Barish ke pani ko collect karke future use ke liye store karna ya groundwater recharge karna.

🚧Misconception

Students aksar sochte hain ki Earth par itna pani hai toh shortage kaise? Yaad rakho, most of the water saline hai, freshwater bahut kam hai.

Sun: Energy ka Main Source

Sun Earth par energy ka ultimate source hai. Iski energy ke bina life possible nahi hai.

Sun ki Energy ke Uses

Photosynthesis: Plants sunlight use karte hain apna food banane ke liye (food chain ka base).
Heat aur Light: Sun se humein heat aur light milti hai.
Heat: Clothes sukhane, food items dry karne (jaise mirch, papad) mein help karti hai.
Light: Din ke time visibility provide karti hai.
Solar Energy: Sun ki energy ko electricity mein convert kiya ja sakta hai.
Solar Panels: Rooftops, street lights, traffic signals par lagaye jaate hain electricity generate karne ke liye.
Solar Cookers: Sun ki heat se khana pakane ke liye.
Solar Water Heaters: Pani garam karne ke liye.
Vitamin D: Sunlight hamari body mein Vitamin D banati hai, jo bones ke liye zaruri hai.

Sun ki Importance ke Bina Kya Hoga?

Agar Sun kuch din ke liye gayab ho jaye toh:
Plants photosynthesis nahi kar payenge, jisse food production ruk jayega.
Earth bahut thandi ho jayegi.
Electricity generation (solar panels se) ruk jayegi.
Life survive karna mushkil ho jayega.

❗Important

Sun Earth par energy ka main source hai. Iski energy se hi sabhi living beings survive karte hain.

💡Tip

Solar energy ke uses (solar cooker, solar water heater, solar panels) aur unke benefits long answer questions mein aa sakte hain.

Forests: Importance aur Preservation

Forests dense growth of plants aur trees wale bade areas hote hain. Yeh Earth ke liye bahut important hain.

Forests ki Importance

Habitat: Bahut sare wild animals, birds aur insects ka natural home.
Food aur Shelter: Animals ko food aur shelter provide karte hain.
Oxygen Production: Plants photosynthesis ke through oxygen release karte hain, jo hamare liye essential hai.
Carbon Dioxide Absorption: Air se carbon dioxide absorb karte hain, jisse global warming control hoti hai.
Soil Conservation: Trees ki roots soil ko hold karti hain, jisse soil erosion rukta hai.
Water Cycle: Forests rainfall ko attract karte hain aur water cycle maintain karte hain.
Products: Wood, medicines, fruits, rubber, paper jaise valuable products provide karte hain.

Deforestation aur Uske Consequences

Deforestation: Large scale par trees ko cut karna.
Causes: Farming ke liye land clear karna, building construction, wood ki demand.
Consequences:
Loss of habitat for animals.
Air pollution badhna (CO₂ increase, O₂ decrease).
Soil erosion badhna.
Rainfall mein kami.
Climate change.

Forest Preservation

Afforestation: Naye trees lagana.
Reforestation: Cut kiye gaye areas mein dobara trees lagana.
Van Mahotsav: July mein celebrate kiya jane wala forest festival jismein trees lagaye jaate hain aur awareness badhai jaati hai.
Responsible Use: Wood aur other forest products ka judicious use karna.
Protecting Wildlife: Forests mein rehne wale animals ko protect karna.

❗Important

Forests ko 'Green Lungs of the Earth' bhi kehte hain kyunki yeh oxygen produce karte hain aur carbon dioxide absorb karte hain.

🚧Misconception

Students aksar deforestation ke sirf ek ya do consequences hi likhte hain. Sabhi major consequences (habitat loss, pollution, soil erosion, climate change) ko yaad rakho.

Soil, Rocks aur Minerals: Formation aur Uses

Soil, rocks aur minerals Earth ke important natural resources hain, jinse hamari daily life mein bahut kuch banta hai.

Soil

Formation: Soil rocks ke disintegration (breaking apart) se banti hai. Yeh process Sun, water aur living organisms ke actions se hazaron saalon mein hota hai.
Importance:
Plant Growth: Plants ko nutrients aur support provide karti hai. Soil particles ke beech ki space mein air aur water hota hai jo roots ke growth ke liye zaruri hai.
Habitat: Bahut sare microorganisms, insects aur animals ka ghar.
Water Storage: Pani ko store karti hai.

Rocks

Formation: Rocks minerals ke aggregation se bante hain.
Uses:
Construction: Houses, buildings, temples, roads, dams banane mein use hote hain (e.g., granite, marble, sandstone).
Tools: Purane zamane mein stone tools aur weapons banane mein use hote the (hand axes, arrowheads).
Roofing: Kuch rocks (jaise slate) roofing ke liye use hote hain.

Minerals

Formation: Rocks minerals se bante hain.
Extraction: Important metals (aluminium, gold, copper, iron) minerals se extract kiye jaate hain.
Uses:
Manufacturing: Airplanes, cars, jewellery, cosmetics, electrical aur electronic equipment banane mein use hote hain.
Energy: Uranium jaise minerals nuclear energy ke liye use hote hain.

📖Definition

Soil: Rocks ke disintegration se banti hai, plants ke growth ke liye essential hai.

❗Important

Rocks minerals se bante hain aur minerals se metals extract kiye jaate hain.

Fossil Fuels: Formation aur Conservation

Fossil fuels energy ke important sources hain, lekin yeh non-renewable hain aur inka judicious use zaruri hai.

Fossil Fuels Kya Hain?

Examples: Coal, petroleum (petrol, diesel, kerosene), aur natural gas.
Formation: Yeh millions of years mein bante hain.
Dead plants aur animals (microorganisms) jo Earth ke andar deep buried ho gaye the, high pressure aur temperature ki wajah se fossil fuels mein convert ho gaye.

Fossil Fuels ke Uses

Transportation: Petrol aur diesel vehicles mein use hote hain.
Electricity Generation: Coal power plants mein electricity banane ke liye use hota hai.
Cooking: LPG (petroleum se) aur natural gas cooking ke liye use hote hain.
Industry: Factories mein energy source ke roop mein.

Conservation of Fossil Fuels

Fossil fuels limited quantities mein hain aur ek baar use hone ke baad replenish nahi hote jaldi.
Why Conserve? Agar hum aise hi use karte rahe toh jaldi khatam ho jayenge.
Conservation Methods:
Public Transport: Apni personal gaadi ki jagah public transport use karo.
Carpooling: Ek hi destination par jane wale log ek hi gaadi share karein.
Walking/Cycling: Short distances ke liye walk ya cycle karo.
Alternate Energy Sources: Solar energy, wind energy, hydro energy jaise renewable sources ka use badhao.
Efficient Appliances: Energy efficient appliances use karo.

Environmental Impact

Fossil fuels jalane se smoke aur carbon dioxide release hoti hai, jo air pollution aur global warming ka cause banti hai.

📖Definition

Fossil Fuels: Dead plants aur animals ke remains se millions of years mein bante hain (e.g., coal, petrol, natural gas).

💡Tip

Fossil fuels ko non-renewable resource kyun kehte hain? Iska answer aur unke conservation methods important hain.

Natural Resources: Renewable aur Non-renewable

Natural resources woh hain jo nature se milte hain aur hamari needs ko fulfill karte hain. Inko do categories mein classify kiya ja sakta hai.

Natural Resources

Definition: Resources jo nature se milte hain aur hamari needs ko pura karte hain (e.g., air, water, sunlight, forests, soil, rocks, minerals, fossil fuels).
Human-made Resources: Jo resources human beings banate hain apni convenience ke liye (e.g., roads, buildings, vehicles).

Classification of Natural Resources

Renewable Resources:

Definition: Resources jo naturally renew, replenish ya restore ho jaate hain ek reasonable time period mein.
Examples: Air, water, sunlight, forests.
Characteristics: Inexhaustible (khatam nahi hote) ya relatively quickly regenerate ho jaate hain.
Importance: Sustainable hain, matlab future generations ke liye available rahenge agar judiciously use kiye jayein.

Non-renewable Resources:

Definition: Resources jo limited quantities mein hain aur jinhe banne mein millions of years lagte hain. Ek baar use hone ke baad yeh jaldi replenish nahi hote aur exhaust ho sakte hain.
Examples: Minerals, soil, rocks, coal, petroleum, natural gas (all fossil fuels).
Characteristics: Exhaustible (khatam ho sakte hain).
Importance: Inka judicious use aur conservation bahut zaruri hai kyunki inki quantity limited hai.

📖Definition

Renewable Resources: Jo naturally renew ho jaate hain (e.g., air, water, sunlight).

📖Definition

Non-renewable Resources: Jo limited quantity mein hain aur banne mein bahut time lagta hai (e.g., fossil fuels, minerals).

💡Tip

Renewable aur non-renewable resources ke examples aur unke beech ka difference bahut common question hai. Table format mein yaad karo.

Natural Resources ka Responsible Use

Natural resources hamari needs ko pura karte hain, lekin unka judicious aur responsible use bahut zaruri hai future generations ke liye.

Why Responsible Use?

Scarcity: Bahut sare resources limited hain (non-renewable).
Pollution: Resources ka over-exploitation pollution badhata hai (air, water, soil).
Sustainability: Future generations ko bhi resources mil payein, iske liye sustainable practices zaruri hain.

Responsible Use ke Tarike (3 Rs)

Reduce (Kam Karna):

Pani ka use kam karo (taps band rakho).
Electricity ka use kam karo (lights, fans band karo jab zarurat na ho).
Paper ka use kam karo (digital notes, double-sided printing).

Reuse (Dobara Use Karna):

Plastic bags ki jagah cloth bags use karo.
Old clothes ko pocha banane mein use karo ya donate karo.
Glass bottles ko pani store karne ke liye use karo.

Recycle (Punarachakra):

Waste paper, plastic, glass aur metal items ko recycle karo.
Recycling se naye products banane mein kam resources lagte hain.

Other Actions

Planting Trees: Zyada se zyada ped lagao green cover badhane ke liye.
Alternate Energy: Solar, wind energy jaise clean energy sources ka use badhao.
Awareness: Logon ko resources ki importance aur conservation ke baare mein educate karo.
Public Transport: Personal vehicles ki jagah public transport use karo pollution aur fuel consumption kam karne ke liye.

⭐Remember

3 Rs (Reduce, Reuse, Recycle) natural resources ko conserve karne ke basic principles hain. Inko hamesha yaad rakho.

💡Tip

Daily activities mein natural resources ke uses aur unko conserve karne ke ways long answer questions mein aa sakte hain. Practical examples do.

Easy (15)

Which gas makes up the largest percentage of air?
- Oxygen
- Carbon dioxide
- Nitrogen (correct)
- Argon
Why: Nitrogen is the most abundant gas in the air, making up about 78%.
Moving air is commonly known as what?
- Breeze
- Storm
- Wind (correct)
- Air current
Why: Moving air is defined as wind.
Approximately what fraction of the Earth's surface is covered by water?
- One-quarter
- One-half
- Two-thirds (correct)
- Three-quarters
Why: Water covers about two-thirds of the Earth’s surface.
What is the main source of energy on Earth?
- Wind
- Water
- The Sun (correct)
- Fossil fuels
Why: The Sun is the primary source of energy for all life on Earth.
What is the process of collecting and storing rainwater for later use called?
- Water purification
- Rainwater harvesting (correct)
- Water recycling
- Groundwater recharge
Why: Rainwater harvesting is the collection and storage of rainwater.
Which of the following is NOT a fossil fuel?
- Petrol
- Coal
- Natural gas
- Biogas (correct)
Why: Biogas is not a fossil fuel; petrol, coal, and natural gas are.
What is the term for resources that get renewed or restored within a reasonable period of time?
- Non-renewable resources
- Human-made resources
- Renewable resources (correct)
- Limited resources
Why: Renewable resources are those that can be renewed or restored over time.
Which of these is NOT a natural resource?
- Air
- Water
- Plastic (correct)
- Sunlight
Why: Plastic is a human-made resource, not a natural resource.
Oxygen is essential for our survival.
Why: Our body needs oxygen to perform its functions for survival.
Most of the water on Earth is freshwater, easily accessible for all uses.
Why: Most water on Earth is saline, and only a small fraction is easily accessible freshwater.
Forests are only useful for providing wood.
Why: Forests provide food, shelter, and natural homes for many wild animals, not just wood.
Soil is formed by the disintegration of rocks over a very long time due to actions of the Sun, water, and living organisms. This process takes thousands of years. The space between soil particles provides sufficient air and space for plant roots to grow. Soil is a vital natural resource for agriculture and supporting plant life.
Why: Soil is formed by the breaking apart, or disintegration, of rocks.
The energy from the Sun can be directly used for cooking in a solar cooker or for heating water in a solar water heater. This energy is a clean and renewable source, reducing reliance on fossil fuels. Solar panels on rooftops capture the Sun’s energy to produce electricity, demonstrating its versatility.
Why: A solar cooker uses the Sun's energy directly for cooking.
Identify the component of air that is represented by the blue squares in the diagram.
- Oxygen
- Carbon Dioxide
- Nitrogen (correct)
- Argon
Why: The blue squares in Fig. 11.1 represent Nitrogen, the largest component of air.
The image shows a method of collecting water. What is this method called?
- Groundwater pumping
- Water purification
- Rainwater harvesting (correct)
- Desalination
Why: The diagram illustrates rainwater harvesting, where water is collected from rooftops.

Medium (15)

Why is it difficult to hold your breath for a long time?
- The body needs carbon dioxide to function.
- The body does not get enough oxygen to perform its functions. (correct)
- The lungs get tired from holding air.
- The air becomes too warm inside the body.
Why: Holding breath prevents the body from getting essential oxygen for its functions.
Which of the following activities requires freshwater?
- Swimming in the ocean
- Generating electricity in a tidal power plant
- Growing crops (correct)
- Extracting salt from seawater
Why: Growing crops, along with drinking and cooking, requires freshwater.
How do solar panels contribute to energy production?
- They generate heat for cooking.
- They capture the Sun's energy and produce electricity. (correct)
- They store wind energy for later use.
- They purify water using sunlight.
Why: Solar panels convert sunlight into electricity, providing a clean energy source.
Why is it important to use fossil fuels responsibly?
- They are renewable resources and will regenerate quickly.
- They are found in limited quantities and take millions of years to form. (correct)
- Burning them produces oxygen, which is harmful.
- They are very expensive to extract.
Why: Fossil fuels are non-renewable and take millions of years to form, making responsible use crucial.
Match the natural resource with its primary use.
Why: Each resource has a key role: air for breathing, water for daily needs, sunlight for plants, and forests for wildlife.
Match the resource type with its example.
Why: Forests are renewable, coal and petroleum are non-renewable fossil fuels, and plastic is human-made.
Match the natural resource with its primary component or characteristic.
Why: Air is a gas mixture, ocean water is saline, soil comes from rocks, and rocks contain minerals.
Match the resource type with its implication for use.
Why: Renewable resources are sustainable, non-renewables are limited, fossil fuels pollute, and forests regrow slowly.
What is the name of the week-long event celebrated in July to raise awareness about respecting forests and planting new trees?
Why: Van Mahotsav is the forest festival celebrated in July.
What are important metals like aluminium, gold, copper, and iron extracted from?
Why: Important metals are extracted from minerals found in rocks.
What is the term for resources created by human beings to meet their needs?
Why: Resources created by humans are called human-made resources.
Arrange the steps of soil formation from rocks in the correct sequence:
Why: Soil forms from rock disintegration over thousands of years due to natural factors.
Arrange the following fuels in the order of their formation time, from shortest to longest:
Why: Biogas forms quickly, wood takes years, and fossil fuels take millions of years.
What is the primary function of the structure shown in the image, which is a traditional stepwell?
- To store grains
- To provide access to groundwater and store water (correct)
- To serve as a place for religious ceremonies only
- To generate electricity
Why: Bawadis (stepwells) are traditional structures for accessing and storing water.
The image shows a common material used in construction. What is this material primarily made of?
- Wood
- Plastic
- Minerals (correct)
- Clay
Why: Laterite rocks, used as bricks, are composed of various minerals.

Hard (10)

Assertion (A): It is difficult to hold our breath for a long time. Reason (R): Our body needs oxygen to perform its functions, and holding breath stops its supply.
Why: The difficulty in holding breath is directly due to the body's need for continuous oxygen supply.
Assertion (A): Water is a precious resource. Reason (R): Most of the water on Earth is saline and not fit for domestic, agricultural, and industrial use.
Why: Water is precious because most of it is unusable saline water, making freshwater scarce.
Assertion (A): Fossil fuels are non-renewable resources. Reason (R): They are formed from the remains of microorganisms and plants over millions of years and are found in limited quantities.
Why: Fossil fuels are non-renewable because their formation takes millions of years, and their supply is finite.
A family lives in a remote area and relies on natural resources for most of their needs. They use a solar cooker for cooking, collect rainwater for drinking and bathing, and gather firewood from a nearby forest for heating during winter. One year, there is a prolonged drought, and the forest experiences significant deforestation due to illegal logging. Which of the following resources would be most severely impacted for this family due to these events?
- Solar energy for cooking
- Air quality
- Water and firewood (correct)
- Minerals from the soil
Why: Drought impacts rainwater, and deforestation impacts firewood availability, directly affecting the family's water and heating.
A city is planning to implement sustainable practices. They are considering replacing traditional streetlights with solar-powered ones and encouraging rainwater harvesting in all new buildings. They also want to reduce air pollution caused by vehicles. Which of the following actions would best address the air pollution concern, based on the chapter's information?
- Increasing the number of public parks and green spaces.
- Promoting the use of electric vehicles that do not release smoke. (correct)
- Building more solar power plants outside the city.
- Implementing stricter regulations on industrial waste disposal.
Why: Promoting electric vehicles directly reduces smoke and air pollution from transportation, as mentioned in the chapter.
A farmer observes that the soil in his field has become less fertile over time. He recalls that healthy soil provides sufficient air and space for roots. He also knows that soil is formed from rocks. Which of the following practices would NOT directly help in improving the soil's ability to support plant growth by maintaining its structure and air content?
- Ploughing the field regularly to loosen the soil.
- Adding organic matter like compost to the soil.
- Using heavy machinery that compacts the soil. (correct)
- Ensuring proper drainage to prevent waterlogging.
Why: Heavy machinery compacts soil, reducing air space and hindering root growth, contrary to improving soil structure.
Identify the natural resource that is primarily used for constructing the roof in the given image.
- Wood
- Clay
- Rocks (e.g., slate) (correct)
- Metal
Why: Figure 11.6 shows a roof made of slate tiles, which are a type of rock.
The image displays ancient tools. What natural resource were these tools primarily crafted from?
- Wood
- Bones
- Stone (rocks) (correct)
- Metal
Why: The hand axes shown are stone tools, crafted from rocks.
Which of the following statements are true regarding the Sun as a natural resource?
- The Sun is the main source of energy on Earth. (correct)
- Sunlight helps plants prepare food. (correct)
- Solar panels convert the Sun's heat into electricity.
- The Sun's energy is a non-renewable resource.
Why: The Sun is Earth's main energy source and vital for photosynthesis; solar panels convert light, and solar energy is renewable.
Which two of the following are examples of non-renewable natural resources?
- Air
- Coal (correct)
- Forests
- Natural gas (correct)
Why: Coal and natural gas are fossil fuels, which are non-renewable resources.