Lignin is the main constituent of

  • A
    Woody tissues
  • B
    Growing tissues
  • C
    Phloem
  • D
    Cortex

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Collenchymatous tissue is found in

Lignin is the main component of the cell wall of .......

The cell wall thickenings generally present in water-conducting tissues that appear as swollen nodules are called:

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Sclerenchyma usually . . . . . . and . . . . . . protoplasts.

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