Question

stomata movement is not affected by
1 temperature
2 light
3 O2 concentration
4 Co2 concentration

Answer 1

Stomata movement is not affected by O2 concentration.

An increase in temperature causes stomata to open due to its effect on the permeability of the guard cells.
An increase in the intensity of light makes the guard cells go turgid, thus influencing the stomatal movement.
A decrease in CO2 concentration results in a biochemical process by which the stomatal cells open.
Thus, only O2 concentration does not affect the stomatal movement.

Answer 2

Stomata: Openings that are very tiny and is used for gas exchange by the leaves of the plant is referred to as stomata.

Stomata movement: The process of opening and closing of stomata is called as stomatal movement.

The outer wall is thin and inner wall is thick in a guard cell.

Opening:

• Turgid guard cells.
• Open stomata.

Closing:

• Flaccid guard cells.
• Closed stomata.

Reasons for stomata movement:

• Temperature causes stomata to open as guard cells are permeable.
• Intensity of light makes the guard cells turgid and opens the stomata.
• CO2 concentration also affects the stomata movement up to a certain extent.

Hence, The O2 concentration does not have any significant effect on the stomata movement.

The answer is (3) O2 concentration.