BotanyThorn:

Thorn:

  1. A

    is usually a modification of root.

  2. B

    commonly occurs in Citrus and Bougainvillea

  3. C

    lacks vascular bundles 

  4. D

    never bears flower

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    Solution:

    The thorn is a hard, straight and pointed structure. In Bougainvillea, Citrus and Duranta, the axillary bud is modified into a thorn. In Carissa, the terminal bud is modified into a pair of thorns. The thorn sometimes bears leaves, flowers and fruits as seen in Duranta and Pomegranate. The thorns not only check the rate of transpiration but also protect the plants from herbivore animals.

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