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Which of the following plants cannot flower if the duration of light exposure is more than the critical photo-period?

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Short night plants

Long night plants

Day neutral plants

Long day plants

answer is B.

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Detailed Solution

Long night plants cannot flower if the duration of light exposure is more than the critical photo-period. They must be exposed to light for a period less than this critical duration before the flowering is initiated in them. Example: Tobacco

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