Which of the following statement is true `,`

Options

A. The collenchyma occurs in layers below the epidermis in monocotyledonous plants
B. Sclerenchyma cells are usually dead and without protoplasts
C. Xylem parenchyma cells are living and thin walled and their cell walls are made up of lignin
D. The companion cells are specialized sclerenchymatous cells

Answer

B

Explanation

Sclerenchyma consists of thick walled dead cells. The cells vary in shape, size and origin. They possess hard and extremely thick secondary walls due to uniform deposition of lignin. In the beginning the cells are living and have protoplasm but due to deposition of impermeable secondary walls they become dead.