Question

What are stomata? What functions do they perform? How is opening and closing of stomata controlled?

Answer 1

STOMATA:---- It is the tiny opening in the epidermis of a plant, through which gases and water vapor is passed............. FUNCTIONS of Stomata :------- The gas exchange that takes place when stomata is opened allows photosynthesis to take place...................... OPENING and CLOSING of Stomata is controlled by changes in the turgor pressure of the two guard cells. Its opening and closing is regulated by the integration of environmental signals and endogenous hormonal stimuli.

Answer 2

Their main function is to allow gases such as carbon dioxide, water vapor and oxygen to move rapidly into and out of the leaf
Stomata are minute aperture structures on plants found typically on the outer leaf skin layer, also known as the epidermis. They consist of two specialized cells, called guard cells that surround a tiny pore called a stoma

Their main function is to allow gases such as carbon dioxide, water vapor and oxygen to move rapidly into and out of the leaf
Opening and closure of the stomatal pore  is mediated by changes in the turgor pressure of the two guard cells.The turgor pressure of guard cells is controlled by movements of large quantities of ions and sugars into and out of the guard cells.