Which of the following is a type of tissue in plants that is dead at maturity?

a. Parenchyma

b. Sclerenchyma

c. Collenchyma

d. All of these are alive at maturity.

The correct answer will be option-B.

Explanation:

The plant tissues are composed of three types of cells: parenchyma, collenchyma and sclerenchyma.

The parenchyma and collenchyma remain alive at their maturity but sclerenchyma loses their protoplasm and become dead. These cells deposit lignin in their secondary walls and form hard tissues of the plant-like hard shell of a coconut. Sclerenchyma provides mechanical strength to the plant.

Thus, Option-B is the correct answer.