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Question

If a plant produces flower on exposure to alternating exposures of 4 hours light and 2 hours dark in a 24 hour cycle, it should be a:

A
Short day plant
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B
Day neutral plant
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C
Long short day plant
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D
Long day plant
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Solution

The correct option is D Long day plant
Plant which requires exposure to light for a period exceeding the critical day length for flowering, is a long day plant, while those plants which require a period less than the critical day length is a short day plant.

Plants which have no effect on the duration of light exposure for induction of flowering are day neutral plants.

Long short day plants are those in which flowering occurs after a series of long days followed by short days.

The given plant is exposed to a total of 16 hours of light and 8 hours of dark in a 24 hour cycle with alternating 4 hours of light and 2 hours of dark, to induce flowering. Hence, the plant is a long day plant.


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