Which of the following shows the presence of a semipermeable membrane?

  • A
    Vessels
  • B
    Tracheids
  • C
    Fibres
  • D
    Wood parenchyma

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Assertion: In angiosperms,the conduction of water is more efficient because their xylem has vessels.
Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

In the first formed primary xylem,the secondary wall thickening may be of

Write a note on complex tissues.

Which of the following is absent in most of the monocotyledons?

What is the thickening material present in this tissue?

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