Question

In grasses, shape of guard cells in stomata is :

• A. Pyriform shaped
• B. Spindle shaped
• C. Bean shaped
• D. Dumb-bell shaped

Answer 1

The correct option is D Dumb-bell shaped

Stomata are structures present in the epidermis of leaves. Stomata regulate the process of transpiration and gaseous exchange.

Each stoma is composed of two bean shaped cells known as guard cells which enclose stomatal pore. In grasses, the guard cells are dumb-bell shaped.

The outer walls of guard cells (away from the stomatal pore) are thin and the inner walls (towards the stomatal pore) are highly thickened.
(a) (b)