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    Question

    Transport in xylem is essentially _____ while in phloem

    it is _______. 
    A Unidirectional, bidirectional Correct Answer Incorrect Answer
    B Bidirectional, Unidirectional Correct Answer Incorrect Answer
    C Unidirectional, Unidirectional Correct Answer Incorrect Answer
    D Bidirectional, Bidirectional Correct Answer Incorrect Answer

    Solution

    Transport in xylem (of water and minerals) is essentially unidirectional, from roots to the stems whereas the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional, depending on the source and sink. 

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