A) The long dark period is not critical
B) It is affected by intengaption of long dark period by brief exposure of light
C) It is not affected by interruption of long dark period by brief exposure of light
D) It is affected if the continuous light period is interrupted
Correct Answer: B
Solution :
Short day plants flower when exposed to day lengths shorter than a certain critical duration. Interruption by dark during long light period does not stimulate flowering. It means they do not flower if dark period is interrupted by a flash of light. They are also called long night plants. In contrast, interruption by dark during long light period does not inhibit flowering in long-day plants (short-night plants).
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