FFA Horticulture CDE General Practice Exam

What is the role of stomata in plant leaves?

1. Absorb sunlight

2. Regulate gas exchange

3. Store nutrients

4. Provide structural support

The correct answer is: Regulate gas exchange

Stomata play a critical role in regulating gas exchange in plant leaves. These small openings, typically found on the underside of leaves, allow for the exchange of carbon dioxide and oxygen between the plant and its environment. During photosynthesis, plants absorb carbon dioxide from the air through the stomata and release oxygen as a byproduct. Additionally, stomata facilitate transpiration, which is the loss of water vapor from the plant. This process helps to maintain water and nutrient uptake from the roots while also cooling the plant. The function of stomata is essential for plant health and efficiency in photosynthesis, illustrating their significance in the overall physiological processes of plants. Other options, such as absorbing sunlight or storing nutrients, do not accurately represent the function of stomata, as these activities are carried out by different plant structures. For instance, sunlight absorption occurs primarily through chlorophyll in the leaf cells, while nutrient storage is managed by various tissues and the root system. Structural support is provided mainly by cell walls and other supporting tissues, not by stomata.