NCERT Class VII Science Solutions: Chapter 9 – Soil Part 2

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Question 7:

Read the following statements and give the appropriate terms for each of them.

  1. The process of breakdown of rocks by the action of wind, water, sunlight.

  2. Removal of top soil during heavy rains or strong winds.

  3. Accumulation of wastes in the soil generated by human activity which alter the features of soil.

  4. The process of movement of water into deeper layers of soil.

Answer:

Image of Weathering and Erosion

Weathering and Erosion

Image of Weathering and Erosion

  1. Weathering

  2. Erosion

  3. Soil pollution

  4. Percolation

Question 8:

Unscramble the following jumbled words related to soil.

As showing in images is a Unscramble the following jumbled words related to soil.(Q)

Unscramble the Following Jumbled Words Related to Soil.(Q)

As showing in images is a Unscramble the following jumbled words related to soil.(Q)

Answer:

As showing in images is a Unscramble the following jumbled words related to soil.(A)

Unscramble the Following Jumbled Words Related to Soil.(A)

As showing in images is a Unscramble the following jumbled words related to soil.(A)

SHORT ANSWER QUESTIONS

Question 9:

Which of the following situations - ‘A’ or ‘B’ - is advantageous for absorption of water and minerals? Why?

Situation ‘A’: Growth and branching of roots in the C-horizon.

Situation ‘B’: Growth and branching of roots in A and B-horizons.

Answer:

Situation ‘B’ is advantageous to plants because A- and B- horizons are rich in water, minerals and humus.

Question 10:

How can a farmer convert acidic soil to neutral soil?

Answer:

He can add a small quantity of quick lime or slaked lime solution to the soil. Quick lime and slaked lime are bases and hence, react with the excess acid present in the soil and reduce its acidity.

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