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  4. One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?

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Q. One set of a plant was grown at $12$ hours day and $12$ hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?

AIPMTAIPMT 2004Plant Growth and Development

Solution:

When the dark period is interrupted by the flash of light, the plant could not produce flowers because the dark period could not reach the critical requirement. It shows that the plant needs a long dark period than the light period. So, it is a short day plant. Hence, the correct answer is 'Short day'