NEET AIPMT SOLVED PAPER MAINS 2011

  • question_answer Function of companion cells is                                   

    A)  providing energy to sieve elements for active transport

    B)  providing water to phloem

    C)  loading of sucrose in to sieve elements by passive transport

    D)  loading of sucrose into sieve elements

    Correct Answer: D

    Solution :

    The companion cells are specialised parenchyma cells, which are closely associated with sieve tube elements. The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls. The companion cells help in maintaining the pressure gradient in the sieve tubes. They also function in loading of sucrose into sieve elements actively.

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