Soil Formation

Q. In what type of regions does the process of soil formation take place relatively quickly?

1. Regions with low temperatures
2. Regions with high rainfall
3. Regions with low rainfall
4. Regions with high temperatures

Q. What is the biotic material that gets mixed into the soil called?

1. Topsoil
2. Subsoil
3. Humus
4. Organi matter

Q. The _____ of a region decides the intensity of weathering of rocks.

1. temperature
2. amount of rainfall
3. climate
4. humidity

Q. Identify the main factors influencing the weathering of the parent rock.

1. Slope of the land
2. Climate of the region
3. Hardness of the rock
4. Roughness of the rock

Q. Soil formation starts with the process of _______ .

1. Contraction of rocks
2. Expansion of rocks
3. Weathering of rocks
4. Formation of humus

Q. Identify the factors that influence soil formation.

1. The biotic material in the region
2. Climate of the region
3. Slope of land
4. Parent rock

Q. When does the soil become fertile?

1. When the proportion of humus in the soil is less.
2. When the soil has no humus.
3. When the proportion of humus in the soil is lesser than a threshold.
4. When the proportion of humus in the soil is high.

Q.

Choose the weathering process which is dominant in dry climate:

1. Physical weathering

2. Chemical weathering

3. Biological weathering

Q.

Which factor is more responsible for the quick formation of soil in Rajasthan?

1. Rainfall

2. Soluble rocks

3. Vegetation cover

4. Extreme difference in day and night temperature

Q. What needs to get mixed with powdered rock for it to become soil?

1. Biotic material
2. Minerals
3. Nutrients
4. Rocks of a different kind

Q. Small particles of rock are changed into soil when they are
(a) made into fine powder
(b) mixed with humus
(c) mixed with water
(d) all of the same size