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← Nature & AnimalsWhich outcome occurs when a CAM pathway plant lacks adequate water during peak daylight hours?
A)Stomata remain closed, preventing CO2 uptake✓
B)Photorespiration minimizes carbon fixation losses
C)Increased transpiration cools leaf surfaces
D)Increased malic acid production inhibits growth
💡 Explanation
When water is scarce, CAM plants prioritize water conservation via stomatal closure to prevent excessive transpiration; due to temporal separation of initial CO2 fixation mediated by PEP carboxylase rather than Rubisco in mesophyll cells, CO2 intake is halted. Therefore, stomata closure results, as opposed to photorespiration decrease, cooling, or malic acid buildup, which depend on other conditions.
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