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Question

The opening and closing of the stomatal pore depend upon:


A

Oxygen

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B

Temperature

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C

Water in guard cells

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D

The concentration of CO2 in stomata

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Solution

The correct option is C

Water in guard cells


The correct option is C.

Explanation of the correct option:

  1. Water in guard cells controls the opening and closing of the stomatal pore.
  2. The opening and closing of the stomatal pore are called stomatal movements.
  3. This movement is shown in response to the entry or exit of water from guard cells.
  4. The tiny pores found in the epidermis of leaves are known as stomata.
  5. The Stomatal apparatus consists of a pore called a stoma, which is enclosed by kidney-shaped guard cells on the outer side.

Explanation of the incorrect option:

Option A:

The opening and closing of the stomatal pores do not depend upon oxygen.

Option B:

The opening and closing of the stomatal pores do not depend upon temperature.

Option D:

The opening and closing of the stomatal pores do not depend upon the concentration of CO2 in stomata.

Final answer: The opening and closing of the stomatal pore depend upon water in guard cells.


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