Give reasons for
Give reasons for
(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
Ans. Cells of meristematic tissue are capable of division. Hence, prominent nucleus and dense cytoplasm are present in these cells. Since these cells continuously undergo division hence they do not need to maintain a particular shape and store food. Due to this, vacuoles are not required in these cells.
(b) Intercellular spaces are absent in sclerenchymatous tissues.
Ans. Cell wall in sclerenchyma is lignified. Due to this, intercellular spaces are absent in sclerenchymatous tissues.
(c) We get a crunchy and granular feeling, when we chew pear fruit.
Ans. In a pear fruit, cells of scelerenhyma are small and called stone cells. We get the crunchy feeling due to these stone cells.
(d) Branches of a tree move and bend freely in high wind velocity.
Ans. Collenchyma is present at junction of a branch. Collenchyma provides rigidity with flexibility. Due to this, branches of tree move and bend freely in high wind velocity.
(e) It is difficult to pull out the husk of a coconut tree.
Ans. The husk of coconut tree is composed of sclerenhyma. Due this, the husk is very hard and is difficult to be pulled out.
