You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two ?

  • [NEET 2014]
  • A

    Secondary xylem

  • B

    Secondary phloem

  • C

    Protoxylem

  • D

    Cortical cells

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A vascular bundle without pith is

Vascular bundles in monocotyledons are considered closed because

  • [NEET 2015]

The vertical section of a dorsoventral leaf through the lamina shows three main parts namely, epidermis, ...$A$... and vascular system. The epidermis, which covers the upper surface is ...$B$... and lower surface is covered by ...$C$... of the leaf.

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