Question

how do guard cell regulate opening and closing of stomatal pores?

Answer 1

When guard cells are turgid or filled with water, the stomatal pore is open and when they are devoid of water, the stomatal pore is closed.
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Answer 2

Answer:

Explanation:

The opening and closing of stomatal pore is a function

of guard cells. Stomata act as turgor operated valves.

The guard cells are thicker on the inner side and

thinner on the outer side. The guard cells swell when

water flow into them from the surrounding epidermal

cells. They get curved out due to thick inner walls and

produce a pore in between. Similarly, the pore closes

when guard cells lose water to their surrounding cells

and shrink back to their original position.