Formation of Soil

Q.

One of the following factors does not lead to soil formation in nature:

1. the sun

2. the water

3. the wind

4. the polythene bags

Q.

The thin layer of loose mixture of small rock particles and rotting organic matter covering the land

1. Soil

2. Earth

3. Humus

4. Weathered rock

Q. How does the thickness of the soil increase over time?

1. By erosion of the soil.
2. By the deposition of weathered particles.
3. By the breaking of bed rock.
4. By the decaying plant and animal matter.

Q.

Removal of topsoil by wind and water is called ________.

1. soil conversion

2. soil binding

3. soil erosion

4. none of these.

Q. The rate of weathering is determined by the climatic conditions of a place.

1. False
2. True

Q. Consider the following two places:
Place A: An arid desert which experiences sandstorms from time to time.
Place B: A land at the foothills of a mountain range.

Which of the following places would you expect to be better suited for agriculture?

1. Place A
2. Place B
3. Cannot say
4. Both places would be equally suitable

Q. What is weathering?

1. The changing of weather over a period of time.
2. The prediction of weather.
3. The breaking of rocks into smaller pieces.
4. The process of erosion of the topsoil.

Q. Soil is formed due to which of the following events?

1. Climatic changes
2. Natural vegetation
3. Grazing of animals
4. Parent rock

Q. The rate of weathering is determined by the climatic conditions of a place.

1. True
2. False

Q. Which of the following layers of soil is a mixture of sand, silt, and clay and consists mainly of minerals and leached materials such as iron and aluminium compounds?

1. Weathered rock material
2. Top soil
3. Bedrock
4. Subsoil

Q. What is the first step in soil formation?

1. Weathering
2. Deposition
3. Curing
4. Erosion

Q. Select the major factors responsible for soil formation.

1. Parent rocks
2. Wind velocity
3. Humidity
4. Climate
5. Whether
6. Altitude
7. Flora
8. Sunlight
9. Fauna
10. Time

Q. How long does it take for the formation of 1cm of soil?

1. 1 year
2. 10 years
3. 50 years
4. 100+ years