12. Give reasons for
(a) Meristematic cells donot have vacuole.
(b) We get a crunchy and granular feeling when we chew pear fruit.
(c) Branches of trees move and bend freely in high wind velocity.
CLASS 9 SCIENCE
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a) Meristematic cells divide frequently and give rise to new cells and hence they need dense cytoplasm and thin cell wall. Vacuoles causes hindrance in cell division as it is full of cell sap to provide turgidity and rigidity to the cell. ... Meristematic cells do not need to store these nutrients as they have compact shape.
b) In a pear fruit, cells of sclerenhyma are small, rounded and called stone cells. They are hard with highly thickened cell wall. These cells give the crunchy and granular feeling when we chew pear fruit.
c) Branches of a tree move and bend freely in high wind velocity because of the presence of collenchyma that adds the property of flexibility.
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