AP BIOLOGY

Detailed explanation-1: -Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and nonstretchable and are usually found in nongrowing regions of plant bodies, such as the bark or mature stems.

Detailed explanation-2: -(Figure 5) is composed of sclerenchyma cells, which are usually dead at maturity (i.e., have lost their protoplasts). They characteristically contain very thick, hard secondary walls lined with lignin; consequently, sclerenchyma provides additional support and strength to the plant body.

Detailed explanation-3: -Sclerenchyma cells once matured are usually the dead cells that have heavily thickened secondary walls containing lignin. These cells are found in the non-growing region of the Plants like bark and the mature stems, and these cells are rigid and non-stretchable in nature.

Detailed explanation-4: -The sclerenchyma is called the dead tissue because it lack protoplasm and has thick secondary walls which do not elongate during cell growth. Hence, mature cells get destroyed inside the sclerenchyma tissues.

Detailed explanation-5: -Unlike parenchyma and collenchyma, sclerenchyma cells are nonliving when mature.