SSC Ecology And Environment Sample Paper NCERT Sample Paper-4

  • question_answer
    The soil near the surface is usually darker than about one meter down, this is because the top soil

    A)  is richer in Ca and Mg

    B)  Contains more organic matter

    C)  is wetter than the sub soil

    D)  is drier than the sub soil

    Correct Answer: B

    Solution :

    [b] Topsoil is the upper, outermost layer of soil, usually the top 2 inches (5.1 cm) to 8 inches (20 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. It also houses many organisms. Plants generally concentrate their roots in and obtain most of their vital nutrients from this layer. The actual depth of the topsoil layer can be measured as the depth from the surface to the first densely packed soil layer known as subsoil.

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