C4 plants outperform C3 plants in hot, dry conditions primarily because they
- Acheck_circle
Concentrate CO₂ at Rubisco via PEP carboxylase, suppressing photorespiration
- B
Use Rubisco in mesophyll cells instead of bundle-sheath cells
- C
Skip the Calvin cycle entirely, using only the light reactions
- D
Open stomata only at night to absorb CO₂
Explanation
PEP carboxylase fixes CO₂ in mesophyll, then 4-carbon shuttle delivers it to bundle-sheath at high concentration. High CO₂ near Rubisco favors carboxylation over oxygenation, minimizing photorespiration. Choice (D) is CAM, not C4.