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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?

1. Long day
2. Darkness neutral
3. Day neutral
4. Short day

Correct answer: Short day

Solution

Short-day plants flower only when the night is long and uninterrupted. Since a flash of light during the night stopped flowering, this plant is a short-day plant.

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