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Stomata of CAM plants

1. never open
2. are always open
3. open during the day and close at night
4. open during the night and close during the day

Correct answer: open during the night and close during the day

Solution

CAM plants open their stomata at night to take in CO2 when temperatures are lower and water loss is reduced. During the day, they keep stomata closed and use the stored CO2 for photosynthesis.

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