Soil, Its Four Layers, and The Process of Its Formation

Q. In which layer of the soil do we plant the seeds?

1. On top soil
2. On subsoil
3. On bedrock
4. On weathered rock

Q.

What are various components of soil?

Q. Which of the following factors affect soil formation?

1. Relief
2. Climate
3. Time
4. Soil texture

Q. The subsoil is a mixture of:

1. sand
2. silt
3. pebbles
4. clay

Q. Arrange the process of weathering in the order it occurs.

i) Rocks exposed to temperature changes undergo expansion and contraction.

ii) Ice or roots of plants widens the cracks.

ii) Rainwater enters the cracks and becomes ice when the temperature drops.

iv) Over a period of time the rocks break and disintegrate into many pieces.

1. i, ii, iii, iv
2. i, iii, ii, iv
3. ii, i, iii, iv
4. iii, ii, i, iv

Q.

The slow process by which rocks break-up due to the action of wind, water, sudden temperature changes and living things is called _________.

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

Q. Which of the following is not a factor that directly affects the process of soil formation?

1. Relief
2. Vegetation
3. Longitude
4. Climate

Q. Which of the following layers of soil is also known as parent rock?

1. Subsoil
2. Bedrock
3. Topsoil
4. Weathered rock

Q. Which is the bottom-most layer of soil?

1. Bedrock
2. Subsoil
3. Weathered rock material
4. Topsoil

Q. Which of the following is not a factor that affects the process of soil formation?

1. Time
2. Parent rocks
3. Climate
4. Soil texture

Q. Weathering is the first step in the process of soil formation.

1. True
2. False