Why does the guard cells of a stoma open and close?

Answer 1

the function of the stoma in opening and closing is to regulate water
within the plant
the plant needs to maintain a water balance

Answer 2

Opening and closing of stoma is due to osmosis in the guard cells. During the day guard cells have high osmotic potential due to presence of sugar and photosynthesis. There by water enters them, thru osmosis and makes them turgid, which opens them. At night, the sugar contenct is depleted due to absnce of sunlight The guard cells lose their osmotic potential, or become negative in potential. Water leaves the guard cells, they become flaccid and close/cover the stoma.

Answer 3

A stoma (also stomate; plural stomata) is a tiny starting or pore, got here upon frequently on the fewer than-floor (pores and epidermis) of a plant leaf, and used for gas substitute. The pore is shaped by using a pair of fairly specialist parenchyma cells prevalent as guard cells that are to blame for regulating the dimensions of the outlet. Air containing carbon dioxide enters the plant by using those openings the position it receives utilized in photosynthesis and respiration. Oxygen produced by using photosynthesis in the chlorenchyma cells (parenchyma cells with chloroplasts) of the leaf interior exits by using those self same openings. also, water vapor is released into the ambience by using those pores in a procedure said as transpiration.

Answer 4

Stomata opens to release water , through it , so the plant gains a negative pressure for the uptake of water through the roots & also for the entry of CO2 .It is present in abundance on the lower part of the leaf. Guard cells open & close due to the differnce in osmotic pressure b/w the guard & cells adjacent to them.Potassium ions maintain the osmotic pressure