When are the stoma on a plant usually open?

Answer 1

The stomata are controlled by a pair of guard cells, which are specialized parenchyma cells. When it is humid and bright outside, a proton pump expels protons from the guard cells, causing a depolarization in the cells. This opens voltage-gated channels, and allows an uptake of Potassium ions to keep the cells open. Negative ions balance the influx of Potassium to maintain the negativity. If Chlorine ions also enter, the osmotic pressure changes, which increases the turgor pressure. The resulting turgor pressure helps keep the pore open as well.

Answer 2

The stoma of leaves are opened to allow CO2 to go in so that photosynthesis can be performed and to allow O2 to be released. The stoma are closed to prevent the plant from losing too much water.

Answer 3

Stomata on a plant are usually open during the day and closed at night. They open to allow for gas exchange, such as the intake of carbon dioxide for photosynthesis, and close to minimize water loss through transpiration.

Answer 4

The Stoma on a plant are usually open during the day because the sunlight is absorbed in the guard cells, which control the opening and closing of the stoma.