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Question

Which one keeps its stomata open during night and closed during day?

A
Cactus
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B
Water lily
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C
Ivy
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D
Hibiscus
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Solution

The correct option is A Cactus
Scotoactive stomata are the stomata which open in dark and close during the day time. Scotoactive stomata occur in succulent like Cactus, Bryophyllum, Opuntia. The succulents perform crassulacean acid metabolism or CAM type of photosynthesis and their stomata are accordingly modified.

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