SSC Geography Sample Paper NCERT Sample Paper-7

  • question_answer
    Consider the following statements:
    1. Calcium is a dominant ion in soil which gives a physical and chemical stability to the clay humus complex.
    2. The presence of calcium ions in the soil solution antagonizes the uptake of other ions such as boron magnesium and phosphate.
    Which of the above statements is/are correct?

    A)  1 only

    B)         2 only

    C)  Both 1 and 2    

    D)  neither 1 nor 2

    Correct Answer: C

    Solution :

    [c] All soils contain calcium ions (Ca2+) and magnesium (Mg2+) cations (positively charged ions) attracted to the negative exchange sites on clays and organic matter (cation exchange complex of the soil).

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