BotanyWhich of the following controls the activities of sieve tubes in phloem tissue?

Which of the following controls the activities of sieve tubes in phloem tissue?

  1. A

    Phloem fibres.

  2. B

    Sieve elements

  3. C

    Phloem parenchyma

  4. D

    Companion cells

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    Solution:

    • Companion cells are located adjacent to sieve tubes.
    • Sieve tubes are devoid of the nucleus, but it has to perform all their cellular activities for which the nucleus of companion cells performs all the activities of both sieve tubes and companion cells.
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