How does stomata open?

Answer 1

The stomata's function is to allow gas exchange with the surrounding air, so that the plant can intake carbon dioxide and oxygen. Stomatal opening is favored when there is plentiful water and moderate temperatures. Abscissic acid, a plant hormone, acts on the guard cells to open and close stomata. Some plants are even genetically engineered with a mutated era gene, which makes them more sensitive to abscissic acid and more prone to the opening and closing of guard cells.

When guard cells are full of water, they stretch away from each other and the stomata are open. When guard cells are limp, they fall on each other and the stomata are closed.

Potassium ions play a role in the opening and closing of stomata by changing the concentration of ions in the guard cells. When the potassium ions are in the guard cells, water also flows in the guard cells because of osmosis and the stomata open. When the potassium ions are out of the guard cells, water also flows out of the guard cells because of osmosis and the stomata close.

Answer 2

When the guard cells are turgid (swollen with water) the guard cells open the stomata. When water leaves the guard cells they lose turgor and the stomata close.

Answer 3

Stomata open in response to environmental cues such as light intensity, carbon dioxide levels, and internal plant signals like hormones. When guard cells surrounding the stomatal pore take up water and become turgid, they bow outwards, causing the stomata to open. Conversely, loss of water causes the guard cells to become flaccid, leading to stomatal closure.

Answer 4

the guard cells swell with water and a gap is formed which makes sense if you only want to open the stomata when you have enough water