Nature's Treasures NCERT Solutions | Science for Class 6 PDF Download

Let us enhance our learning

(ii) Machines are a resource found in nature. [F]
Correction: Machines are human-made resources, not found in nature.

(iii) Natural gas is a non-renewable resource. [T]

(iv) Air is a renewable resource. [T]

Q3: 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
Ans: (b) Petrol

Petrol is commonly used in two-wheelers like scooters and bikes because it is a highly efficient fuel that provides the necessary power for internal combustion engines. Unlike diesel, which is used in larger vehicles, petrol burns quickly and is suitable for small engines.

(ii) An example of a renewable resource is _______
(a) Coal
(b) Water
(c) Natural gas
(d) Petrol
Ans: (b) Water

Water is a renewable resource because it is naturally replenished through the water cycle, including processes like evaporation, condensation, and precipitation. However, its availability depends on conservation and responsible use.

Q4: Classify the following as renewable or non-renewable resources—coal, natural gas, forests and minerals.
Ans: 

• Coal: Non-renewable (fossil fuel, finite).
• Natural gas: Non-renewable (fossil fuel, finite).
• Forests: Renewable (regrow with time).
• Minerals: Non-renewable (geological formation).

Q5: Why do we say that petroleum is a non-renewable resource?
Ans: Petroleum is a non-renewable resource because it takes millions of years to form from the remains of microorganisms and plants buried deep inside the earth. Once used, it cannot be replenished within a human lifetime.

Q6: It is difficult to regrow forests. Justify this statement.
Ans: It is difficult to regrow forests because the process of growing trees to maturity takes many years. Additionally, the ecological balance and biodiversity that develop in a forest over centuries cannot be easily replicated. Human activities, such as large-scale deforestation, further complicate the regrowth of forests.

Q7: Make a list of five daily activities in which you use natural resources. Suggest ways by which you can reduce their use.
Ans: 

Q8: List four activities that are possible due to the presence  of air.
Ans: 

• Breathing
• Flying kites
• Inflating balloons
• Generating wind energy through windmills

Q9: How can you contribute towards enhancing the green cover of your locality? Make a list of actions to be taken.
Ans:
Actions:

• Planting trees and shrubs in the community.
• Encouraging community participation in tree-planting drives.
• Protecting existing trees from being cut down.
• Creating awareness about the importance of green cover.
• Supporting local initiatives that aim to increase green spaces.

Q10: 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.
Ans:
(i) Solar Energy
(ii) Benefit: Solar energy is a renewable and clean source of energy. Hence it is environment friendly.
Drawback: Dependence on Weather: Solar energy cannot be used during cloudy days or at night, which limits its reliability and convenience.

Q11: Cutting down trees on a large scale impacts the quality of the soil. Why do you think it is so?
Ans: Cutting down trees on a large scale impacts the quality of the soil because tree roots help in binding the soil, preventing erosion. Without trees, soil becomes loose and can be easily washed away by rain or blown away by wind, leading to loss of fertile topsoil.

Q12: Explain two ways in which human activities pollute the air. Propose one action which can help in reducing air pollution.
Ans: 
Ways of pollution:

• Emission of pollutants from vehicles.
• Industrial emissions releasing harmful gases.

Action to reduce pollution: Promote the use of electric vehicles and public transportation to reduce emissions from vehicles.

Q13: A family uses solar panels to generate electricity, a gas stove to cook food and a windmill for pumping water from a well.   What would happen if there were no sunlight for a week?
Ans: If there were no sunlight for a week, the family would face issues with generating electricity through solar panels, which would affect their power supply. They might need to rely on alternative sources of energy for electricity.

Q14: Fill up the blanks using the following terms—  (fossil fuels, forest, air, petroleum, coal, water and nonrenewable resource)
Ans:
(i) A fuel that is commonly used in two-wheelers like scooters or bikes is petroleum.
(ii) An example of a renewable resource is water.
(iii) Natural gas is a non-renewable resource.
(iv) Air is a renewable resource.

Q15: 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.
Ans: Report: 

Cutting trees for houses and factories causes deforestation, which is bad. Trees give oxygen and help animals. Cutting them harms habitats, climate, and soil. We should plant more trees, log wisely, and use other materials to build and save nature.

Q16: 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?
Ans:
Plan to Use Less Water:

• Use grey water for gardening purposes.
• Implement a rainwater harvesting system.
• Install water-efficient faucets and toilets.

Steps to Implement the Plan:

• Monitor water usage regularly and set reduction targets.
• Encourage student-led initiatives for water conservation.
• Collaborate with local authorities and experts to install water saving devices.

Environmental Benefits:

• Promotes sustainability and responsible water usage within the community.
• Decreases the energy used in water treatment and distribution.

​Intext Questions

Q1.What will happen if the Sun is not visible for a few days? (Page 216)
1. We may have to depend on artificial lighting during daytime also.
2. ______________
3. ______________
Ans: 2. With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it.
3. There will be no natural light and heat, hence stopping many natural phenomena like evaporation, transpiration, condensation, etc.

Q2. What are the consequences of cutting a large forest area? Make a presentation or do a role play, or write a story or a poem that shows what could happen if we continue to cut down trees in our forests. (Page 217)
Ans: The loss of trees and other vegetation can cause climate change, desertification, soil erosion, flooding, increased greenhouse gases in the atmosphere, and a lot of problems for humans
Presentation/Play/Story or Poem: Do it yourself.