Question

State the function of guard cells. What will happen to the guard cells and stomatal pore when water is flows to guard cells?

Answer 1

The guard cells protect the stomatal pores; ensure its opening and closing and even help in regulating transpiration.

When the water flows into the guard cells, it swells up and opens the stomatal pores.

On the other hand, when the water flows out, it shrinks and closes the pores.

Answer 2

guard cells control the opening land closing of stomata. these cells are thinner on the outer side and ticker on the inner side.stomata generally remain open during day time. the opening and closing of stomata is controlled by guard cells.when water flows into the guard cells from the neighbouring epidermal cells they swell i.e. become turgid and becone curved and cause the opening of stomatal pore .when the guard cells lose water tey shrink become straight and cause the closure of stomatal pore. since large amount of water can also be lost through stomata the plant closes these pores when it does not need carbon dioxide for photosynthesis.