Question

what is sclerenchyma describe location structure and economic importance of this tissue.

Answer 1

Sclerenchyma is a permanent tissue, consists of thick-walled dead cells. The clles vary in shape, size and origin. They possess hard and extremely thick secondary walls due to uniform deposition of lignin. Sometimes, they may be unlignified. In the beginning the cells are living and have protoplasm but due to deposition of impermeable secondary walls they become dead.

Sclerenchyma is grouped under two parts:-

1-Fibres
-Consists of long elongated walls
-Have dead thick round pointed cells


2-Sclereids
-Extremely thick lamellated lignified walls with long tubular simple pits
-May be spherical,oval, cylindrical.

Sclerenchyma fibres are economically important because they provide mechanical support to plant.

Answer 2

Answer:

Sclerenchyma is a supporting tissue. It is the tissue which make plant hard and stiff. Location: This tissue is present in stems, around vascular bundles, in the veins of leaves and in the hard covering of seeds and nuts. Structure: The cells of this tissue are dead.