Stomata are composed of two specialized cells called guard cells, which surround a pore. The guard cells are responsible for regulating the opening and closing of the stomatal pore.
The opening and closing of stomata are regulated by various factors, including light, humidity, and the plant's internal water status. Light triggers the uptake of potassium ions by the guard cells, leading to their swelling and the opening of the stomatal pore. Conversely, a decrease in light levels or high humiditycauses the loss of potassium ions, leading to the shrinking of the guard cells and the closure of the stomatal pore.
Study Guide
To understand stomata better, consider focusing on the following key points:
The student develops an understanding of the processes of science by asking questions, predicting, observing, describing, measuring, classifying, making generalizations, inferring and communicating.