give reasons for : a. Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole .
b. Intercelluler spaces are absent in sclerenchymatous tissues.
c. It is difficult to pull out the husk of a coconut tree.
d. Branches of a tree move and bend freely in high wind velocity.
Answers
Answer:
a.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. Sclerenchyma cells have lignified cell walls which makes them compact and leaves no intercellular spaces.
b.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.
c Sclerenchyma is dead, long, thin narrow cells. Walls of sclerenchyma cells are lignified, which make them thick. This tissue makes the plant hard and stiff. ... Such cells make it very hard to pull out the coconut husk.
d.Branches of a tree move and bend freely in high wind velocity because of the presence of collenchyma that adds the property of flexibility.
if any doubts or question u want answer text to
smile_326 my insta account.
Answer:
A) meristematic cells have the function to divide and grow, so they have nucleus and dense cytoplasm they don't have to provide nourishment to plant hence they lack nucleus.
B) because they provide stifgness to plant hence they lack intracellular spaces and their corners also lignified to provide rigidity to plant.
C) serencymatous cells are dead, lignified and thin narrow cells which make the husk of coconut tree hard.
D) because of collenchymatous cells which provide flexibility to branches hence they bend in high velocity.
If u like it plzz follow me.