23.Give reason for (i) Intercellular space is absent in sclerenchyma tissues. (ii) It is difficult to pull out the husk of coconut tree. (iii) meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole. (iv) we get crunchy and granular feeling, when we chew pear fruit. (v) branches of a tree move and bend freely in high wind velocity.
Answers
Answer:
sclerenchymatous tissue is a think cementing substance, made up of lignin, if intercellular space is present means it is not used as a cementing substance. intercellular space is mostly present in parenchymatous tissue that act as a storage for food, air space for floating the leaves these are the uses of inter cellular spaces.
3.yes meristematic cells are prominent nucleus because meristematic cells is the fast dividing cell and also has undifferentiated cells it has lack of vacuole because it does not contain intercellular space mostly it is present in tip of the plant of it need fast dividing does not need vacuole for storage
4.because the fruit surface is made up of sceremchymatous tissue si it is hard to bite.
5.mostly that type of tree are 1°growth is attained
if the plant attain it's 2°growth maximum the stem should not move a distance
hope u understand thank you
Answer:
(i) Intercellular spaces are absent in sclerenchymatous tissues because they have a cementing substance (known as lignin) around their cell membrane which makes them stiff and hard.
(ii) 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.
(iii) Meristematic cells are continuously dividing cells so they have a prominent nucleus and dense cytoplasm. But since these cells do not store food material or waste materials, they lack vacuole. ... The branches of a tree have collenchyma cells which provide tensile strength to plant parts.
(iv) 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.
(v) In collenchyma intercellular spaces are absent and cells are elongated. It is a mechanical tissue which provides support and elasticity to the branches of a tree so that, they move and bend freely in high wind velocity.
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Explanation: