Multiple choice

The opening and closing of stomatal pore depends upon ___.

  1. Oxygen

  2. water in guard cells

  3. concentration of carbon dioxide in stomata

  4. temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The opening and closing of stomata are regulated by the turgor pressure within the guard cells, which is controlled by the movement of water into or out of these cells.

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