Question

b) How opening and closing of stomata takes place?​

Answer 1

Heya❤

☆Guard cells play an important role in opening and closing of stomata.

☆When the water enters, the cells shrink themselves and allow the water to move inside.

☆And the cells swell up after the entry of water in order to prevent the lose of water from the pores.

Hope it helps you

✌✌✌

Answer 2

Hello mate,

Here's your answer:-

Opening and closing of stomata is caused by the opening and closure of the guard cells.

There are two theories describing it:-

1.Sugar concentration theory(old):-As the early sunrays fall on the leaf,the guard cells carry out photosynthesis and form glucose, thereby increasing the solute concentration.This causes water to get inside the guard cells through endosmosis.The guard cells become turgid and open.During night, the starch is sent away from leaf, thereby decreasing the concentration of glucose.This causes water to exit the guard cells and the cells become flaccid and close.

2.K+ion theory(new):-The opening and closing of stoma depend on the generation of potassium ion gradient. During day, photosynthesis occurs in chloroplast of guard cells which results to the production of ATP in the cell.The ATP is used to pumps the K+ ions into the cells.This increases the solute concentration in the cell and opening of stomata occurs similarly as in previous theory. At night k+ ions leak out thus reducing the turgidity of guard cells amd the stomatal pore decreases.

Hope it helps..

Mark as Brainliest..