Page 2 - CBW

8. Give one word for the following:

a) a) A black substance formed by the decay of organic matter and improves soil fertility.
b) b) Removal of the top layer of the soil by natural agents.

9. Ravi, a class 7 student, observed three different soil samples in
his school lab. He performed a percolation test and found that:

Sample A allowed water to pass very quickly.
Sample B held water for a long time.
Sample C had a balanced water retention capacity.

a) Which type of soil is Sample A?
b) Which soil is best for growing wheat?
c) Why is Sample B not ideal for all crops?

10. In a hilly region, farmers use terrace farming to grow crops.
They build steps on slopes of the hills to reduce water flow.

a) What is the main purpose of terrace farming?
b) Which type of erosion is controlled through this
method?
c) How does terrace farming help in soil conservation?

11. a) Identify the image shown.

b) What are the natural reasons that lead to the
condition of the soil depicted in the given image?

c) What preventive measures should be taken to
prevent such condition of the soil?

12. State the type of soil that is best used for the following:

a) Pottery
b) Rice cultivation
c) Gardening

13. Compare the water retention capacity of sandy, clayey, and loamy soils.

14. A school garden project requires fertile soil.
a) What soil tests would you perform and why?
b) Suggest ways to improve soil fertility.

15. How does human activity impact soil quality? Discuss both positive and negative effects with
examples.