NCERT Class VII Science Solutions: Chapter 9 – Soil Part 4

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Question 9:

Explain how soil pollution and soil erosion could be prevented.

Answer:

Prevention of Soil Pollution:

  • Use manures instead of chemical fertilizers.

  • Industrial waste should be treated before release.

  • Avoid use of polythene and plastic or they should not get mixed in soil.

Prevention of Soil Erosion:

  • Afforestation: large scale planting in place of cut down forests.

  • Avoiding over-grazing of grass lands.

  • Use of step-farming in hill regions.

Question 10:

Solve the following crossword puzzle with the clues given:

As showing in images is a crossword puzzle

Crossword Puzzle (Ques)

Across:

2. Plantation prevents it.

5. Use should be banned to avoid soil pollution.

6. Type of soil used for making pottery.

7. Living organism in the soil.

Down:

1. In desert soil erosion occurs through.

3. Clay and loam are suitable for cereals like.

4. This type of soil can hold very little water.

5. Collective name for layers of soil.

Answer:

As showing in images is a crossword puzzle

Crossword Puzzle (Filled)

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