Question

Please answer this in brief please a big request science

Answer 1

Answer:

the figure given in attachment is stomata of plant.

Explanation:

Stomata are composed of a pair of specialized epidermal cells referred to as guard cells (Figure 3). Stomata regulate gas exchange between the plant and environment and control of water loss by changing the size of the stomatal pore. This stomatal movement is affected by several environmental stimuli, such as relative humidity, CO2 concentration, and light intensity. The plant hormone abscisic acid (ABA) plays a central role in guard cell signaling leading to stomatal closure during drought stress. The ABA signal in guard cells is transduced through a complex network of signaling events, including the production of compounds such as nitric oxide (NO) and H2O2, signaling intermediaries such as the guard cell-specific OST1 kinase, changes in cytosolic Ca2+ levels, and Ca2+ oscillations (31, 51, 84, 96, 97). The signaling events triggered by ABA ultimately lead to regulation of ion channels, such as the guard cell outwardly rectifying potassium channel GORK1, which modulates ion efflux from the guard cells (48). Ion efflux from the guard cells also drives the efflux of water and results in a change in guard cell turgor that causes closure of the stomatal pore. For a more comprehensive overview of guard cell signaling networks, the reader is directed to two recent reviews .