explain it i am not understanding why answer is 1st
Q.4. One set of a plant was grown at 12 hrs. 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 flower. Under which one of the following categories will you place this plant
(1) Short day
(2) Long day
(3) Darkness neutral
(4) Day neutral

Dear student, 
​Please find below the solution to the asked query                

If flash of light interrupts the dark period then flowering is prevented in short day plants. This is because short day plant requires day length shorter than critical period and night length longer than critical period. If night of correct duration is interrupted by a flash of light, then the plant fails to flower. Interruption in day length does not bring any response.

Hence, option (1) is correct.
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