Assertion (A): In Bryophyllum, guard cells become turgid during night time Reason (R): In the guard cells of succulents organic acids are accumulated at night

Both A & R are true and R explains A

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Both A & R are true and R does not explains A

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A is true and R is false

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Both A & R are false

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Solution

The correct option is A
Both A & R are true and R explains A

In CAM plants scotoactive stomata open during night. Hence $C O_{2}$ fixation occurs in the dark and forms organic acids which leads to turgidity of guard cells.

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