AP BIOLOGY

Detailed explanation-1: -Sclerenchyma is the tissue which makes the plant hard and stiff. The husk of a coconut is made of sclerenchymatous tissue. The cells of this tissue are dead. They are long and narrow as the walls are thickened due to lignin.

Detailed explanation-2: -Sclerenchyma is a type of simple permanent tissue. Simple tissues are made up of a group of uniform cells having similar structures and perform the same function. Other than sclerenchyma, collenchyma and parenchyma are also simple tissues.

Detailed explanation-3: -6.3.2.3 Sclerenchyma Tissue Sclerenchyma cells possess two types of cell walls: primary and secondary walls. The secondary wall is very thick and highly lignified (15%–35%) and imparts a great rigidity and hardness to the cell and tissue.

Detailed explanation-4: -Sclerenchyma tissue possesses long, narrow cells with thickened walls. They possess secondary walls made of lignin. Lignin is a chemical substance, which acts as cement and hardens them.

Detailed explanation-5: -Sclerenchyma tissue makes the plant hard and stiff.