Question

The wall of cork cells are thickened by the deposition of ----------------

• A. Cutin
• B. Suberin
• C. Lignin
• D. Pectin

Answer 1

The correct option is B

Suberin

The correct option is B.

Explanation of the correct option:

1. Cork cells are rectangular-shaped dead cells that are arranged very close to each other without any intercellular spaces and secrete a waxy substance called Suberin.
2. Suberin gets deposited in the walls of cork cells and makes the walls impermeable to substances like water, gases, etc, preventing water loss from plants, and thus the walls get thickened.

Explanation of the incorrect option:

Option A:

1. Cutin is a waxy water-repelling substance that is responsible for the protection of the underlying layers of the plant. \
2. In desert plants, cutin is present in vast amount and help in preventing water loss by transpiration.

Option C:

Lignin is a polymer that acts like cement and is responsible for making the cell wall hard.

Option D:

Pectin is a substance that is secreted and deposited in the cell wall of the plant that combines with other products like cellulose and lignin and provides structural support to the plant.

Final answer:

The wall of cork cells is thickened by the deposition of suberin.