Factors Controlling Stomatal Aperture

'Khul Ja Sim Sim' the two rocks slide and the gates to a great treasure open. With these magic words "Ali Baba and Chalis Chor" could open the door. Let us now find out what is 'Khul Ja Sim Sim' for moving the guard cells of the stomata, so that CO₂ can enter the stomata and make food for organisms of the earth. You have learnt that more than one factor can trigger the change in the turgor of the guard cells and bring about stomatal movements and control the size of stomatal aperture. The main controlling factors are:

1. Light,
2. The level of CO₂, and
3. High temperature