Texas FFA Nursery Landscape Practice Exam

What is one function of stomates?

1. Photosynthesize

2. Give off water vapor

3. Produce pollen

4. Prevent disease

The correct answer is: Give off water vapor

Stomates, also known as stomata, are small openings found primarily on the surfaces of leaves that play a vital role in the process of gas exchange. One of their primary functions is to regulate the release of water vapor from the plant to the atmosphere, a process known as transpiration. This process not only helps in cooling the plant but also plays a crucial role in the movement of water and nutrients from the roots through the plant. When stomates open, they allow carbon dioxide to enter for photosynthesis, but simultaneously, they also facilitate the release of water vapor. This dual function is essential for maintaining water balance within the plant and ensuring adequate gas exchange. While stomates do participate indirectly in photosynthesis by allowing the entry of carbon dioxide, they do not photosynthesize themselves; rather, they serve as pathways for gas exchange. The other functions mentioned in the choices do not accurately describe the role of stomates. For example, producing pollen and preventing disease are functions associated with other parts of the plant and processes, not stomates specifically. Thus, the accurate description of stomates' function is their ability to give off water vapor during transpiration.