In how many groups the soil has been categorised? Name them.

2

(a)

Give the formula to calculate the absorption percentage.

2

(a)

When we add some dry soil to the water in a glass and stir it, bubbles are observed from the soil. What causes these bubbles to raise?

2

(a)

There are two components of soil one that comes from living thing and other from non-living thing. What are these two components?

2

(a)

List the substances which pollute the soil.

2

(a)

Explain the term humus that is generally found in the uppermost layer of soil.

2

(a)

Can we make toys with the soil obtained from a field? Explain?

2

(a)

Do all types of soil absorb water to the same extent? Give reason for your answer.

2

(a)

For planting rice, which kind of soil would be most suitable?

2

(a)

Why on a hot summer day the soil seems to shimmer?

2

(a)

Explain that "Soil is an inseparable part of our life."

2

(a)

What makes soil a shelter for many living organisms?

2

(a)

Locate the following zones given as boxed items in Figure, which shows a diagram of soil profile. Top soil, Sub soil, C-horizon, Bedrock

2

(a)

Why are earthworms called a farmer's friend?

2

(a)

Why does topsoil have the most humus?

2

(a)