Question

Give reasons for the following statements:

(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.

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Answer 1

Answer:

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Explanation:

(a) Vacuoles have a function of storing food and other nutrients that a cell might need to survive. But, as Meristematic cells have an ability to divide and form new cell so there is no point in storing food and other nutrients when the cell has to divide. So they lack vacuole.

(b) There are no intercellular spaces in the sclerenchyma cells as these cells are lignified to provide strength to the plants.

(c) This is due to the presence of cells known as sclereids or stone cells. The sclereids give a crunchy feeling to the pear fruit because it provides support and hardens the tissue.

(d) Branches of a tree move and bend freely because of the presence of a simple permanent tissue called collenchyma

(e) The husk of a cocunut tree is made up of scelerenchyma tissues which gives rigidity and stiffness to the plant cells due to which we find it tough to pull the husk out.

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Answer 2

Answer:

1)Meristematic cells have a prominent nucleus and a dense cytoplasm but lack a vacuole, this is so because meristematic cells have an ability to divide and form new cell. Vacuoles have a function of storing food and other nutrients that a cell might need to survive.

2)In collenchyma intercellular spaces are absent and cells are elongated. ... The cells of sclerenchyma tissue are closely packed without intercellular spaces, a middle lamella exists between them. Middle lamella is a thin layer of connecting substance containing pectin, lignin and protein

3)We get a crunchy and granular feeling when we chew pear fruit because of the presence of sclerenchyma tissue.The sclerenchyma cells are of two types- fibres and sclereids.The sclereids give a crunchy feeling to the pear fruit because it provides support and hardens the tissue.

4)Branches of a tree move and bend freely in high wind velocity because of the presence of collenchyma that adds the property of flexibility.

5)The husk of a cocunut tree is hard to pull out because ,it is made up of scelerenchyma tissues which is ade of dead cells. Sclerenchyma gives rigidity and stiffness to the plant and also due to the presence of lignin on the walls of the cells we find it tough to pull the husk out