Chapter 11 Nature’s Treasures
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NCERT Class 6 Science (Curiosity) Chapter 11 Nature’s Treasures
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NCERT Class 6 Science (Curiosity) Chapter 11 Nature’s Treasures
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NCERT Class 6 Science (Curiosity) Chapter 11 Nature’s Treasures
Question 1. 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 day time also.
2. ______________
3. ______________
Answer:
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 phenomenons like evaporation, transpiration, condensation etc.
Question 2. 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)
Answer:
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.
Let Us Enhance Our Learning (Pages 227-229)
Question 1 Fig. 11.9 shows items related to natural resources. Match them with their jumbled up names. Make another table and write the names of these resources. Classify these resources as renewable or non-renewable.
Answer:
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) Nature has all the resources to meet human needs. [True]
(ii) Machines are a resource found in nature, [False]
Corrected statement: Machines are human-made resources.
(iii) Natural gas is a non-renewable resource. [True]
(iv) Air is a renewable resource. [True]
Question 3.
Fill in the blank 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
Answer:
(b) Petrol
(ii) An example of a renewable resource is-
(a) Coal
(b) Water
(c) Natural gas
(d) Petrol
Answer:
(b) Water
Question 4.
Classify the following as renewable or non-renewable resources— coal, natural gas, forests and minerals.
Answer:
Question 5.
Why do we say that petroleum is a non-renewable resource?
Answer:
Petroleum takes millions of years to form. It is found in limited quantities and once used, it gets exhausted. It cannot be produced or replenished within a reasonable period of time. Hence, petroleum is called non-renewable resource.
Question 6.
It is difficult to regrow forests. Justify this statement.
Answer:
It is difficult to regrow forests because forests take many years, even decades, to grow back fully. Trees and plants need a lot of time to reach their full size. The soil in areas where forests have been cut down or damaged might not be good for growing new trees. It may need special care to become healthy enough for growing new plants.
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:
(i) Water: We use water for drinking, washing, cooking and maintaining proper hygiene. We can save water at home by minimising its wastage.
(ii) Diesel: Diesel is used as a fuel in heavy motor vehicles such as buses, trucks, tractors and diesel train engines. We should use electric vehicles.
(iii) Petrol: Petrol is used as a fuel in light motor vehicle such as cars, motorcycles and scooters etc. We should use electric vehicles.
(iv) Natural Gas: It is used as a domestic and industrial fuel. We should use alternative sources of energy.
(v) Water: It is used in homes for drinking, cooking food, washing utensils, cleaning flour, brushing teeth, washing clothes, flushing toilets and watering plants. We can save water by minimising its wastage.
Question 8.
List four activities that are possible due’to the presence of air.
Answer:
Four activities that are possible due to presence of air
(i) Breathing
(ii) Generating electricity through wind turbines
(iii) Transportation through aeroplanes.
(iv) Flying kites
Question 9.
How can you contribute towards enhancing the green cover of your locality? Make a list of actions to be taken.
Answer:
- I can contribute towards enhancing the green cover of my locality by adopting following practices:
- I can plant more and more trees and help clean up parks, playgrounds, and other green areas by picking up litter.
- I can take care of the plants and trees growing in or around my locality.
- I can encourage the people in my locality to plant more trees by informing them about the importance of growing trees.
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
(ii) One benefit of solar energy for cooking is that it is a renewable energy source and does not cause air pollution and global warming, so it is environment friendly.
Whereas, one drawback of using solar energy for cooking is that it cannot be used during a cloudy days or night as it requires sunlight to cook food. So, solar energy is not very convenient and reliable, specially during cloudy days and nights.
Question 11.
Cutting down trees on a large scale imports the quality of the soil. Why do you think it is so?
Answer:
Cutting down trees on a large scale impacts the quality of soil. Soil erosion is caused when the trees are cut down on a large scale then the top soil gets exposed and becomes loose because there are no roots to bond soil and no cover to soften the effect of falling rain. Blowing wind and flowing water can then carry away this loose soil easily causing soil erosion.
Question 12.
Explain two ways in which human activities pollute the air. Propose one action which can help in reducing air pollution.
Answer:
(i) Deforestation reduces the number of trees that can abdorb carbon dioxide, increasing the concentration of greenhouse gases.
(ii) Burning fossil fuels in vehicles and factories releases harmful pollutants like carbon monoxide and sulphur dioxide into the air.
Action to reduce air pollution: Promote the use of public transport and electric vehicles to decrease the number of fossil fuel-powered vehicles on the road.
Question 13.
A family uses solarpanels to generate electricity, a gas stove to cook food and a windmill for pumping waterfrom a well. What would happen if there were no sunlight for a week?
Answer:
This family uses solar energy to generate electricity. If there were no sunlight for a week, electricity generation will stop.
Question 14.
Fill up the blanks using the following terms(fossil fuels, forest, air, petroleum, coal, water and non-renewable resources)
Answer:
Question 15.
There is an increasing demand of trees to meet the requirements of industries and for housing. Therefore trees are being cut. Is it justified? Discuss and prepare a brief report.
Answer:
It is not justified to cut trees to meet the requirements of industries and for housing. If the trees disappear
- The temperature on the earth will increase.
- Animals may migrate due to shortage of food
- Soil will not hold water during rains resulting in floods.
- Valuable products such as timber will not be available.
- Lesser scale cutting of trees would lead to lesser rainfall, increased air pollution and soil erosion.
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:
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.
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