question_answer 8)

What is stomatal apparatus? Explain the structure of' stomata with a labelled diagram.

Answer:

The minute pores present in the epidermis are known as stomata. The stomata may be surrounded by either kidney-shaped (in dicots) or by dumb-bell-shaped (in monocots) guard cells. The guard cells in turn are surrounded by other epidermal cells, which are known as subsidiary or accessory cells. The stomatal aperture, guard cells, accessory cellar constitute the stomatal apparatus.                          Diagrammatic representation of stomatal apparatus (a) stomata with bean-shaped guards cells (b) stomata with dumb-bell-shaped guard cells