Question

Q1) Give reasons for-

(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.

(b) Intercellular spaces are absent in sclerenchymatous tissues.

(c) We get a crunchy and granular feeling, when we chew pear fruit.

(d) Branches of a tree move and bend freely in high wind velocity.

(e) It is difficult to pull out the husk of a coconut tree.​

Answer 1

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Answer:

a) Meristematic tissues have prominent nucleus but lack in vacuole, this is because meristematic tissues are responsible for cell division (which needs dense cytoplasm). The vacoule store food particles and other nutrients as well as waste but as the cell has to divide they do not need food to be stored therefore, they lack in vacuoles.

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Answer 2

Answer:

(a) Meristematic cells are the continuously dividing cells of the plant body i.e., they remain metabolically active and as we know that vacuoles serve the purpose of storage in plant cells. Therefore meristematic cells do not require vacuole.

(b) Sclerenchyma tissue are dead simple permanent tissue of the plant. The cells of sclerenchyma are closely packed without intercellular spaces, like tiles in mosaic floor so that, it can provide the strength, rigidity, flexibility and elasticity to the plant to withstand various strains.

Explanation:

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