Soil

Which of the following are the benefits are soil?
1. it supports the growth of plants by holding roots
2. it is natural habitat for many organisms
3. soil is essential for agriculture
4. allof these
Name the process of breaking down of rocks by action os wind, water and climate.
1. a-horizon
2. bedrock
3. weathering
4. none of these
The nature of a soil depends on which factors?
1. rock from which it has been formed
2. type of vegetation that grow on it
3. both rock and vegetation
4. none of these
A vertical section through different layers of soil is called
1. weathering
2. soil profile
3. bedrock
4. A- horizon
Each layer in soil profile differs in which of following factor?
1. texture
2. colour
3. depth
4. all of these
The layers in the soil are called
1. soil horizon
2. horizon
3. profile
4. soil profile
Which of the following is the uppermost layer of the soil or top soil?
1. A-horizon
2. B-horizon
3. C-horizon
4. none of these
Which of the following are the features of A-horizon?
1. it is generally dark in colour as it is rich in humus.
2. it can retain more water in it
3. roots of small plants are embedded completely in the soil
4. All of these
Which layer has lesser amount of humus but more minerals?
1. A-horizon
2. B-horizon
3. C-horizon
4. none of these
Which layer is made up of small lumps of rock with cracks and crevices?
1. A-horizon
2. B-horizon
3. C-horizon
4. none of these