alleryCAM plants (like cactus and pineapple) open their stomata mainly:
ADuring the daytime to maximise CO2 uptake
BAt night to minimise water loss in arid areas
CContinuously, day and night, like C4 plants
DOnly when CO2 levels rise dramatically
Answer & Solution
Correct answer: B. At night to minimise water loss in arid areas
**CAM (Crassulacean Acid Metabolism):** stomata OPEN AT NIGHT to fix CO2 (as malate) when transpiration is low. CLOSED DURING DAY.
Releases internal CO2 for Calvin cycle.
Excellent water conservation.
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