Question

How do guard cells regulate transpiration?

Answer 1

By opening and closing stomata, guard cells regulates the amount of water evaporated i.e, Transpirated.

Answer 2

Guard cells regulate the transpiration by opening and closing of the stomatal pores.when the water flows through stomatal pores, the guard cells swell , resulting into opening of the stomatal pores. When the water flows back , the guard cells shrink, resulting into the closing of the stomatal pores.