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    Question

    Which of the following soil order is mainly found in grassland ecosystems characterized by a thick, dark surface horizon?

    A Entisols Correct Answer Incorrect Answer
    B Inceptisols Correct Answer Incorrect Answer
    C Oxisols Correct Answer Incorrect Answer
    D Mollisols Correct Answer Incorrect Answer
    E Alfisols Correct Answer Incorrect Answer

    Solution

    Mollisols are the soils of grassland ecosystems. They are characterized by a thick, dark surface horizon.  This fertile surface horizon, known as a mollic epipedon, results from the long-term addition of organic materials derived from plant roots.

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