UPSC General Studies Sample Paper General Studies Sample Paper-4

  • question_answer
    Consider the following statements with respect to leaching.
    1. Leaching refers to loss of soluble substances and colloids from the top layer of soil by percolating precipitation.
    2. The rate of leaching increases with the amount of rainfall, high temperatures and the removal of protective vegetation.
    3. It (leaching) results in the formation of laterite soil.
    4. In agriculture, leaching is used as a process to avoid salinity by applying a small amount of excess irrigation.
    Which of the statements given above are correct?

    A)  2 and 3           

    B)  1 and 4            

    C)  2, 3 and 4                    

    D) (d) All of these

    Correct Answer: D

    Solution :

    [d] Leaching is a process by which various nutrients percolate down under influence of water. It is a mechanism of soil formation distinct from the soil forming process of eluviation, which is loss of mineral and organic collids. It leads to formation of laterite soil. It is also used for removing salt in saline areas.

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