Question 38
How do the guard cells regulate opening and closing of stomatal pores?

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Solution

The swelling of guard cells due to absorption of water causes opening of stomatal pores while shrinking of guard cells closes the pores. Opening and closing of stomata occur due to turgor changes in guard cells. When guard cells are turgid (swollen), the stomatal pore is open while in flaccid conditions, the stomatal aperture closes.

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Question 38
How do the guard cells regulate opening and closing of stomatal pores?

Q. Assertion: Opening and closing of stomata is controlled by guard cells.
Reason: Shrinking of guard cells results in the opening of stomatal pore.

The opening and closing of the stomatal pores depends upon :
(a) oxygen (b) water in guard cells (c) temperature (d) concentration of $C O_{2}$ in stomata

Q. (a) How do guard cells regulate opening and closing of stomatel pores?
(b) Two similar green plants are kept separately in oxygen free containers, one in dark and the other in continuous light. Which one will live longer? Give reasons.

Guard cells regulate the opening and closing of stomata.

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Question 38 How do the guard cells regulate opening and closing of stomatal pores?

Question 38
How do the guard cells regulate opening and closing of stomatal pores?