Chapter 11: Nature's Treasures
Comprehensive Exercise (Made for exam preparation)
Class 6 Science
Question 1: Choose the correct option (Multiple Choice Questions):
1. What makes a firki (pinwheel) rotate?
Answer: (B) Wind.
2. Which of the following is an example of a human-made resource?
Answer: (A) Solar panel.
3. Which of the following is a non-renewable natural resource?
Answer: (C) Natural gas.
4. What is the role of plant roots in a forest?
Answer: (B) They hold the soil and prevent it from being washed away.
5. Which less polluting fuels have gradually replaced coal and wood for domestic cooking nowadays?
Answer: (B) Natural gas and Liquefied Petroleum Gas (LPG).
Question 2: Fill in the blanks with the appropriate words:
- 1. Forests are large areas with a dense growth of various types of plants.
- 2. The leaves that fall from the trees decay and enrich the soil with nutrients.
- 3. Resources which we get from nature, like heat and light from the Sun, are called natural resources.
- 4. Fossil fuels take millions of years to form and are found in limited quantities.
- 5. After touching the soil collected from different places, we should wash our hands thoroughly because garbage in the soil may carry harmful germs.
Question 3: State whether the following statements are True or False:
- 1. Air is considered a renewable resource.
Answer: True. - 2. Natural gas is a renewable resource.
Answer: False (Natural gas is a non-renewable resource). - 3. Electric bulbs, furniture, and bicycles are resources created by human beings.
Answer: True. - 4. It takes only a few days for rocks to form in nature.
Answer: False (It takes thousands to millions of years to form rocks). - 5. In forests, fallen leaves act as an example of recycling in nature by enriching the soil.
Answer: True.
Question 4: Match the items in Column 'A' with the correct items in Column 'B':
| Column 'A' | Column 'B' |
|---|---|
| 1. Firki (pinwheel) | (a) Non-renewable natural resources |
| 2. Petrol and Diesel | (b) Decay and enrich the soil with nutrients |
| 3. Furniture and Solar panels | (c) Human-made resources |
| 4. Fallen leaves in forests | (d) Rotates because of the wind |
| 5. Minerals and soil | (e) Different types of fuels used in vehicles |
Correct Matches:
- 1 → (d) Rotates because of the wind
- 2 → (e) Different types of fuels used in vehicles
- 3 → (c) Human-made resources
- 4 → (b) Decay and enrich the soil with nutrients
- 5 → (a) Non-renewable natural resources
Question 5: Classification. Classify the following 5 resources into "Natural Resources" and "Human-made Resources":
Items: 1. River water, 2. Bicycles, 3. Minerals, 4. Coal, 5. Electric bulbs.
- Natural Resources: 1. River water, 3. Minerals, 4. Coal.
- Human-made Resources: 2. Bicycles, 5. Electric bulbs.
Question 6: Answer the following questions in one sentence:
1. What are natural resources?
Answer: Resources that we get directly from nature, such as heat and light from the Sun, water from rivers, and food from plants, are called natural resources.
2. Why is there a tradition in some villages not to pluck all the fruits from the trees in the forest?
Answer: Because the fruits are left for the animals and birds to eat.
3. What are non-renewable resources?
Answer: Resources that are found in limited quantities, get exhausted once used, and are not replenished within a reasonable period of time are called non-renewable resources.
4. Name two fossil fuels commonly used for transportation.
Answer: Petrol and diesel are two fossil fuels used for transportation.
5. What makes a firki (pinwheel) rotate when you hold it and run?
Answer: It is the wind that makes a firki rotate.
Question 7: Give scientific reasons:
1. Reason: We must use and conserve rocks responsibly.
Answer: Because it takes thousands to millions of years to form rocks in nature, making them precious resources.
2. Reason: Plant roots play a vital role in maintaining the soil of a forest.
Answer: Because the roots of plants hold on to the soil tightly and prevent it from being washed away.
3. Reason: Coal, petroleum, and natural gas are considered non-renewable resources.
Answer: Because they take millions of years to form, are present in limited quantities, and get exhausted once they are used.
4. Reason: Bicycles and solar panels are not called natural resources.
Answer: Because they do not occur naturally; they are human-made resources created by human beings for our convenience.
5. Reason: The soil in the forest is naturally enriched and recycled.
Answer: Because the leaves that fall from the trees decay over time and add valuable nutrients to the soil, which is a perfect example of recycling in nature.
Question 8: Answer the following questions in short (2-3 sentences):
1. Distinguish between natural resources and human-made resources with examples.
Answer: Natural resources are essential resources we get directly from nature, such as sunlight, river water, and plants. Human-made resources are useful things created by human beings using natural materials for their convenience, such as furniture and electric bulbs.
2. Describe how recycling happens naturally in a forest.
Answer: In a forest, a lot of leaves fall from the trees to the ground. These leaves decay over time and enrich the soil with nutrients, which are then used by new plants and trees to grow, demonstrating natural recycling.
3. What are fossil fuels? Give examples of their use.
Answer: Fossil fuels are energy resources that take millions of years to form. They are widely used to run different types of vehicles for transportation, for example, petrol and diesel.
4. How has the use of domestic cooking fuels changed over the years?
Answer: In earlier times, people primarily used coal, wood, and dung cakes as fuels for cooking. Nowadays, these have been gradually replaced by less polluting domestic fuels like natural gas and Liquefied Petroleum Gas (LPG).
5. Why is it important to carefully observe the soil collected from different areas using a magnifying lens?
Answer: Observing soil with a magnifying lens helps us see the differences in its texture, colour, and what it contains that we might miss with the naked eye. However, we must wash our hands afterwards, as soil containing garbage can carry harmful germs.