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UPSC General Studies Sample Paper General Studies Sample Paper-1

  • question_answer
    Consider the following statements regarding black soils.
    1. These are poor in nitrogen, phosphorus, potassium and organic matter and rich in potash and lime.
    2. These are porous, friable in nature.
    3. These suited for dry farming as it does not require much moisture.
    4. These soils expand when wet and become difficult to plough.
    Which of the statements given above are correct?

    A)  1, 2 and 3                    

    B)  2, 3 and 4.         

    C)  1, 3 and 4                    

    D)  All of these

    Correct Answer: C

    Solution :

    [c]
    Characteristics of black soils are as follow
    ? Fine textured and clayey in nature.
    ? Has high qualities of lime, iron, magnesium and generally poor percentage of phosphorus, nitrogen and organic matter.
    ? Black in colour as it is formed from weathered lava rocks,
    ? Soil's colour also varies from black to chestnut brown.
    ? Very clayey and therefore highly retentive of water. Because of high clay content, these soils expand when wet and become difficult to plough.
    ? During dry season, black soils shrink and develop big, cracks which help in air circulation.
    ? Soil is very fertile in most of places.
    ? Poor in nitrogen, phosphorus, potassium and organic matter and rich in potash and lime.


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