Question

Explain the major fact which are responsible for the formation of soil

Answer 1

(i) Relief, parent rock or bedrock, climate, vegetation and other forms of life and time are important factors in the formation of soil.

(ii) Various forces of nature such as change in temperature, actions of running water, wind and glaciers, activities of decomposers, etc. contribute to the formation of soil.

(iii) Chemical and organic changes which take place in the soil are equally important.

(iv) Soil also consists of organic (humus) and inorganic materials.

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Answer 2

Answer:

Factors Responsible for the Formation of Soil.

The relief features, parent material, climate, vegetation and other life-forms as well as time apart from human activities are the major factorsresponsible for the formation of soil.

1. Parent Material: It is deposited by streams or derived from in-situ weathering. In this stage, soil inherits many properties like the mineral composition, the colour, the particle size and the chemical elements. For example- Black soil derived its colour from lava rock.

2. Climate: It is one of the important factors in the formation of soil because it affects the rate of weathering of the parent rock.

3. Role of precipitation: The variability in the precipitation modified the composition of the soil. For Example- Areas with little rainfall with high rate of evaporation led to the accumulation of salts in the soil. The soils underlying tropical rain forests tend to be nutrient-poor because of intensive leaching due to heavy rains.

4. Role of temperature: It is also play important role because fluctuations in temperature causes shrinking and swelling, frost action and general weathering in soils.

Biota (Flora, Fauna and Microorganisms): Biota, in conjunction with climate, modifies parent material to produce soil. For Example- Leguminous plants (such as beans, peas, and groundnuts) have nitrogen-fixing bacteria. These plants take the nitrate ions directly from these nitrogen-fixing bacteria. It improves the fertility of soil by fixing atmospheric nitrogen to ammonia or ammonium.