Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by

  • [AIPMT 2009]
  • A

    absence of secondary phloem

  • B

    presence of cortex

  • C

    position of protoxylem

  • D

    absence of secondary xylem.

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Which of the following is the function of heartwood?

Dermal tissue is derived from

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  • [AIPMT 1999]

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  • [AIIMS 1989]