Describe the function of stomata in photosynthesis.

• A. They store energy
• B. They allow carbon dioxide to enter and oxygen to exit the leaf
• C. They absorb sunlight
• D. They synthesize glucose

Answer: (B)

Stomata are tiny openings located on the surface of leaves that play a crucial role in photosynthesis. Their primary function is to facilitate gas exchange: they allow carbon dioxide from the atmosphere to enter the leaf and oxygen, a byproduct of photosynthesis, to exit. During photosynthesis, plants take in carbon dioxide and, with the help of sunlight and chlorophyll, convert it into glucose while releasing oxygen as a waste product.

This gas exchange process is vital for the plant’s ability to produce energy and sustain life. The closing and opening of stomata are tightly regulated by the plant to balance the need for carbon dioxide intake with water loss through transpiration, ensuring the plant can efficiently perform photosynthesis without drying out. Other options, such as storing energy, absorbing sunlight, or synthesizing glucose, do not accurately represent the specific role that stomata play in the overall process of photosynthesis.