Which of the following is not true about 'sclereids'?
Correct answer: A. These are groups of living cells
- A. These are groups of living cells
- B. These are found in nut shells, guava pulp, pear
- C. These are also called stone cells
- D. These are form of sclerenchyma with fibres.
Explanation
Sclereids are a type of sclerenchyma cells. They are short or irregular, their walls are very thick, and irregular and the lumen is very narrow. These are dead cells and do not perform any metabolic functions. They show different types of lignin depositions and also have pits. They are present in hard parts like the endocarp of coconut, hard seed coats fruit pulps. They are also called stone cells and are of different types as brachysclereids, osteoclereids, macrosclereids, asterosclercids, and fileform cells.
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Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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