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Multiple Choice
What process contributes directly to the turgor pressure that opens and closes stomata?
A
Respiration
B
Transpiration
C
Guttation
D
Plasmolysis
E
Active transport
Verified step by step guidance
1
Understand that turgor pressure in plant cells is the pressure exerted by the cell contents against the cell wall, which is crucial for maintaining the plant's structure and function.
Recognize that stomata are small openings on the surface of leaves that regulate gas exchange and water loss. The opening and closing of stomata are controlled by the turgor pressure in guard cells.
Identify that active transport is a process where cells use energy (usually in the form of ATP) to move ions or molecules across a membrane against their concentration gradient.
In the context of stomata, active transport involves the movement of potassium ions (K⁺) into the guard cells. This ion movement causes water to follow by osmosis, increasing the turgor pressure inside the guard cells.
As the turgor pressure increases, the guard cells swell and curve, causing the stomata to open. Conversely, when potassium ions are actively transported out of the guard cells, water exits, reducing turgor pressure and closing the stomata.