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

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Question 4:

Explain how soil is formed.

Answer:

Soil is formed by weathering of rocks. Weathering is the breakdown of rocks by the action of air, wind and water. Soil formation is a slow process. It occurs all the time. Soil formation is a two-step process:

  • Weathering of rocks takes place. Rock is broken down into small particles.

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Rock is Broken down into Small Particles

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  • These small particles mix with humus (organic matter) and form soil.

As showing in images is a small particles mix with humus and …

Small Particles Mix with Humus and Form Soil

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Question 5:

How is clayey soil useful for crops?

Answer:

Clayey soil is rich in humus and are very fertile, so it is suitable for growing cereals like wheat and gram. Such soil is good at retaining water. For paddy, soils rich in clay and organic matter and having a good capacity to retain water are ideal. For lentils (major) and other pulses, loamy soils, which drain water easily, are required.

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Clayey Soil Useful for Crops

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