Question

Cork cells have a deposition of
a. Pectin
b. Cutin
c. Suberin
d. Lignin

Answer 1

The cork cells are a type of dead cells without any intercellular spaces. The outer layer of old tree trunks is formed by the cork cells. The loss of water from the plants is prevented by the cork cells. They help the plant to become more resistant against bacterial and fungal infection.

Complete answer:
The cells which are dead in the plants are called cork cells or phellem. The chemical content which is present in the walls of cork cells is suberin which makes the water and gases of the cells impermeable. The chemical layer of suberin forms a barrier for the movement of water and solute molecules. It also protects the plants against infection by various microorganisms and heat exposure.

The group of closely associated polysaccharides present in the cell walls of the plant is called pectin or pectic substance. They help in the growth of cells physiologically and in cell differentiation. The integrity and rigidity of plant tissue are determined by pectin in the plant cells.

The fatty substances that are deposited in the epidermal cell walls are called cutin and waxes. Both of these together form a waterproof outer layer which is known as the cuticle. The major and important component of the cuticle is cutting. This will help the cuticle to provide a barrier for the water loss.

The organic polymer layer which is abundant in the cell walls of some particular cells is called lignin. It helps in water transport, provides mechanical support to the plants, and resists plants from various stresses.

Hence, the correct answer is option (C).

Note: Suberin is the component that is present in the cork cells. The internal tissues prevent the evaporation of cork cells. At the time of maturity, the cork cells become dead and replace the epidermis layer of the stem or root with the outer boundary. The suberin does not allow the water and gases to go outside of the cork cells. It is overall protecting cork cells that are present on the barks of trees.