Question

Grittiness of the fruit wall is due to the presence of __________.
A.Sclereid
B.Sclerenchyma fibres
C.Tracheids
D.Collenchyma

Answer 1

Hint: In plants that form durable layers, such as the cores of apples and the gritty texture of pears (Pyrus communis), they are tiny bundles of sclerenchyma tissue.

Complete answer:
First we should know about permanent tissue to answer this question. In a plant, the permanent tissues are those tissues containing nondividing cells. In order to fulfil different roles in the plants, the cells are often modified. The permanent tissue's cells are derived from the meristematic tissue. Only fully differentiated cells are the permanent tissue cells.
Now, let us find the solution from the options-
Sclereids, with heavily thickened, lignified walls, are a reduced type of sclerenchyma cells. They have a star shape. The cells may be isodiametric, prosenchyma, forked, or branched intricately. They may be clustered into bundles; form full tubes situated at the periphery, or exist within parenchyma tissues as single cells or small groups of cells. Sclereids, however are comparatively short in contrast with most fibres. Grittiness of the fruit wall is not caused by sclerenchyma, tracheids, and collenchyma.
From these we came to know that options B, C, and D are incorrect.

Hence, the correct answer is option (A)

Note: Sclereids are commonly seen in the vascular tissue, ground tissue, and epidermis. Alexander Tschirch invented the term 'sclereid' in 1885.