AP BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘Sclereids.

Detailed explanation-2: -Assertion: Sclereids are found in fruit walls of nuts, pulp of fruits like guava, pear and sapota and seed coats of legumes. <br> Reason: Sclereids are spherical, oval or cylindrical, highly thickened dead cells with narrow lumen.

Detailed explanation-3: -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-4: -Answer: lignin are sclerenchyma cells that are found in the seed coats and pulp of fruits.

Detailed explanation-5: -Sclereids are a reduced form of sclerenchyma cells with highly thickened, lignified cellular walls that form small bundles of durable layers of tissue in most plants. The presence of numerous sclereids form the cores of apples and produce the gritty texture of guavas.