(a) How do guard cells regulate opening and closing of stomatal pores ?

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Solution

The guard cells control the opening and closing of stomatal pores by the osmosis process. When water flows into the guard cells, it swells up and the curved surface causes the stomata to open.

When the guard cells lose water, they shrink and become straight ,which leads to closing the stomata.

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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.

How do the guard cells regulate opening and closing of stomatal pores? Explain with the help on diagram.

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

Q. The opening and closing of the stomatal pore depends upon

(a) Oxygen
(b) Temperature
(c) Water in the guard cells

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Standard XII Biology

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(a) How do guard cells regulate opening and closing of stomatal pores ?

The guard cells control the opening and closing of stomatal pores by the osmosis process. When water flows into the guard cells, it swells up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become straight ,which leads to closing the stomata.

The guard cells control the opening and closing of stomatal pores by the osmosis process. When water flows into the guard cells, it swells up and the curved surface causes the stomata to open.

When the guard cells lose water, they shrink and become straight ,which leads to closing the stomata.