Question

The sclerenchyma cells are thick walled due to the presence of
A. Acetone
B. Lignin
C. Lipids
D. None of the above

Answer 1

Sclerenchyma is usually departed (dead) and without protoplast. Sclerenchyma has two types of cells: sclerenchyma fibers, sclereids.
Sclerenchyma fibers: - Tough walled, elongated and needle-like cells occur in mass in various parts of plants. Ex: - mesocarp of coconut (coil).
Sclereids: - Sclereids are oval or cylindrical or spherical. Made up of very tough walled, departed (dead) cells. Commonly found in the wall of fruit like Sapota, peer, and guava, etc.
Sclerenchyma gives mechanical support to plants. Depending upon their shape and thickening sclereids they are of 5 types namely, Brachey, Marco, osteo, Astero, tricho sclereids.

Complete answer:
Acetone: Acetone is usually used for cleaning in house products. In laboratory purpose and commercial operations.
Lignin: sclerenchyma cell wall is made up of dead cells, with a thick composition of highly lignified cells. Cells are generally elongated and thread-like structures. Cells are compactly arranged hence intercellular spaces are absent. At certain spaces in the wall, there is a depression called pits. A secondary wall is absent in this region. Sclerenchyma is made up of two types of cells namely, sclerenchyma fibers and sclereids.
Lipids: Lipids are present in both the layers in the fluid mosaic model. They give elasticity and fluidity to the membrane.
So, the correct answer is “Option B”.

Note:
Sclerenchyma comprises narrow, long cells with tough and lignified cell walls with few or many pits. Lignin is an organic compound. Member of an aromatic alcohol group. Naturally produced from certain plants, mainly from woody plants and algal plants. Lignin is very thick and provides rigidity to the cell wall. It is found in the cell wall of plants.