- A stomata
- B leaf veins
- C root hairs
- D flower petals
Correct answer: A. stomata
Explanation: Stomata allow CO₂ in and O₂ out of the leaf.
Concept context
Light reactions, the Calvin cycle, C3/C4/CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.