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Q: Which tissue has heavily thickened lignified walls?
  • A. Collenchyma
  • B. Parenchyma
  • C. Aerenchyma
  • D. Sclerenchyma
Correct Answer: Option D - In sclerenchyma, thick and strong ilignified tissues are found which is made up of dead cells. It has thick cell wall where lignin is present.
D. In sclerenchyma, thick and strong ilignified tissues are found which is made up of dead cells. It has thick cell wall where lignin is present.

Explanations:

In sclerenchyma, thick and strong ilignified tissues are found which is made up of dead cells. It has thick cell wall where lignin is present.