Give reasons:
- Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
- Intercellular spaces are absent in sclerenchymatous tissues.
- We get a crunchy and granular feeling when we chew pear fruit.
- Branches of a tree move and bend freely in high wind velocity.
- It is difficult to pull out the husk of a coconut tree.
Answer:
- 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.
- Pear has sclerenchymatous stone cells which are granular in texture. Hence, we get the crunchy and granular feeling while chewing a pear.
- The branches of a tree have collenchyma cells which provide tensile strength to plant parts. So, it move and bend freely when wind blows.
- The husk of a coconut tree is made up of sclerenchyma cells which have lignified cell walls. Lignin makes the cells compact and leaves no intercellular spaces.