A) day
B) night
C) Both and
D) always closed
E) always open
Correct Answer: B
Solution :
In certain plants, especially succulents, which grow under semi-arid conditions, atmospheric \[C{{O}_{2}}\] fixes in dark. The process was first observed in plants belonging to family-Crassulaceae hence, termed as crassulacean acid metabolism. In these plants stomata open during night and closed during day.
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