CAM plants (like cactus and pineapple) open their stomata mainly:

Question

Accepted 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.

Answer

During the daytime to maximise CO2 uptake

Answer

Continuously, day and night, like C4 plants

Answer

Only when CO2 levels rise dramatically

CAM plants (like cactus and pineapple) open their stomata mainly:

Keep practising Photosynthesis in Higher Plants