Which plant structure is responsible for a plant's gas exchange with the atmosphere?

• A. Chloroplast.
• B. Stomata.
• C. Mesophyll.
• D. Stroma.

Answer: (B)

Verified step by step guidance

1. Identify the function of each plant structure mentioned in the options: Chloroplast, Stomata, Mesophyll, and Stroma.
2. Understand that gas exchange in plants involves the intake of carbon dioxide (CO2) and the release of oxygen (O2) during photosynthesis.
3. Recognize that stomata are small openings on the surface of leaves and stems that facilitate gas exchange by opening and closing.
4. Note that chloroplasts are involved in photosynthesis but are not directly responsible for gas exchange with the atmosphere.
5. Conclude that the structure responsible for a plant's gas exchange with the atmosphere is the stomata, as they regulate the movement of gases in and out of the plant.