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Manipal Medical Manipal Medical Solved Paper-2009

  • question_answer
    From evolutionary point of view, tracheids and sieve cells are more primitive than tracheae and sieve tubes respectively. The angiosperms have

    A)  tracheae and sieve tubes

    B)  tracheids, tracheae and sieve tubes

    C)  tracheae, sieve cells and sieve tubes

    D)  tracheids, tracheae and sieve cells

    Correct Answer: B

    Solution :

     In angiosperms, xylem consists tracheids, vessel or  tracheae,  xylem  fibres  and  xylem parenchyma.   Tracheae   are   absent   in pteridophytes    and    gymnosperms.    In angiospermic phloem, sieve elements are sieve tubes, while in gymnosperms and pteridophytes sieve cells are found.


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