How does opening and closing of stomata take place? Class 10 Biology Respiration
Answers
Opening of stomata: Solutes from neighbouring epidermal and mesophyll cells enter the guard cells lowering its osmotic potential and water potential. This lowered water potential and osmotic potential will allow movement of water into guard cells from neighbouring cells. Guard cells become turgid due to water accumulation in them which results in the opening of the guard cells.
Closing of stomata: As the somata open the solute concentration is reduced. This makes the water from the guard cells to move away into neighbouring cells. Now, guard cells becom flaccid with no water. They collapse against each other and result in the closing of stomata.
The opening and closing of the stomata is a function of the guard cells.
The guard cells swell up when water flows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink