Question

why do sclerenchyma have narrow lumen....Where are these tissues present and why....
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Answer 1

Answer:

What are sclerencyma?

Here's some info about them:

• Sclerencyma is a type of permanent plant tissue.
• It makes the plant hard. E.g., husk of a coconut.
• The cells of this plant tissue are found to be purely dead; are long and narrow, due to the presence of lignin on their walls.

Now, your straight forward answer:

• Sclerencyma has narrow lumen due to the presence of lignin on its wall.
• They are present in the husk of coconut.
• They harden the plant tissue, and are protective in function.

Answer 2

Answer:

The cells of this tissue are dead. They are long and narrow as the walls are thickened due to lignin, a chemical substance, which acts as a cement and hardens them. The sclerenchyma cells are of two types, fibres and sclereids. We get a crunchy and granular feeling when we chew pear fruit due to sclerenchyma tissue.