Here's how it works:
* Water vapor enters the leaf: When the air inside the leaf is drier than the air outside, water vapor from the atmosphere diffuses into the leaf through the stomata.
* Water vapor exits the leaf: When the air inside the leaf is wetter than the air outside, water vapor diffuses out of the leaf through the stomata. This process is called transpiration.
How do stomata open and close?
Stomata are controlled by specialized cells called guard cells. When guard cells take in water, they become turgid (swollen) and open the stomata. When guard cells lose water, they become flaccid (limp) and close the stomata.
Factors affecting stomata opening and closing:
* Light: Stomata generally open in the light and close in the dark.
* Carbon dioxide concentration: When carbon dioxide levels inside the leaf are low, stomata open to allow more carbon dioxide in for photosynthesis.
* Water availability: When water is scarce, stomata close to prevent water loss.
* Temperature: High temperatures can cause stomata to close to prevent water loss.
The stomata play a critical role in the plant's water balance, gas exchange, and overall health. They allow the plant to take in carbon dioxide for photosynthesis, release oxygen as a byproduct, and regulate the amount of water lost to the atmosphere.
