Which process involves exchanges of gases in plants?

Which process involves exchanges of gases in plants?

• A. Petals
• B. Internode
• C. Radicle
• D. Transpiration

Answer: (D)

Gas exchange in plants happens mainly through stomata on leaf surfaces. When these openings are open, carbon dioxide can diffuse into the leaf for photosynthesis, and oxygen (from photosynthesis and respiration) can diffuse out, along with water vapor. This movement of gases is closely tied to transpiration, because transpiration occurs through those same stomatal openings and involves the loss of water vapor as gas exchange proceeds. The other options are simply plant parts with unrelated roles—petals are for reproduction, internodes are stem segments, and the radicle is the embryonic root—so they don’t describe a gas-exchange process.

Gas exchange in plants happens mainly through stomata on leaf surfaces. When these openings are open, carbon dioxide can diffuse into the leaf for photosynthesis, and oxygen (from photosynthesis and respiration) can diffuse out, along with water vapor. This movement of gases is closely tied to transpiration, because transpiration occurs through those same stomatal openings and involves the loss of water vapor as gas exchange proceeds. The other options are simply plant parts with unrelated roles—petals are for reproduction, internodes are stem segments, and the radicle is the embryonic root—so they don’t describe a gas-exchange process.