Question

When water enters the guard cells the stomata?

Answer 1

When water enter the guard cells of stomata the guard cells swell up to take CO2 and when water is out from the guard cells they give out O2. Thus guard cells are necessary for gaseous exchange.

Answer 2

What will happen to the guard cell and stomata pore when water flows to the guard cell?

1. Become turgid & curved.
2. Cause the opening of stomatal pore.