Question

The cells of the ................ are polygonal in cross-section and have unevenly thickened walls.

• A. Parenchyma
• B. Collenchyma
• C. Aerenchyma
• D. Sclerenchyma

Answer 1

Answer: (B)

Collenchyma

1. Parenchyma forms the major component within organs and is closely packed or have intercellular space and are living with the ability of cell division. They perform functions of photosynthesis, storage, and secretion.
2. Collenchyma is found in the hypodermis in dicot plants and may be oval, spherical or polygonal in shape. It consists of cells which have deposition of cellulose, hemicellulose, and pectin around the corner and provide mechanical support to the plant, helps in bending and provide tensile strength to stem.
3. Aerenchyma is the special type of parenchyma that has air in it to provide buoyancy to the plant and helps in floating of the aquatic plant (hydrophytes) as seen in Hydrilla.
4. Sclerenchyma is long, narrow cells with thick and lignified cell walls having a few or numerous pits provide mechanical support and are economically important. These are commonly found in fruit wall of nuts, the husk of coconut, seed coat of legumes and jute etc.

So the correct option is "Collenchyma