Stomata close when guard cells become

Stomata open when guard cells:

Stomata open when guard cells have:

Stomata open when guard cells show

Stomata open when guard cells swell due to

Stomata open when guard cells swell due to

Stomata open when guard cells swell due to

Stoma remains closed when guard cells are _______.

[A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+ concentrations results in exo-osmosis in guard cells.