A) Never open
B) Are always open
C) Open during the day time and closed at night
D) Open during the night and closed during the day.
Correct Answer: D
Solution :
[d] Open during the night and closed during the day CAM (Crassulacean Acid Metabolism) plants open stomata only at night (when temperature is low and humidity is high) to cause lesser loss water e.g., Opuntia, Agave.
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