Which one of the following is correct for blooming of short day plants?
A
The long dark period is not critical.
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B
It is affected by interruption of long dark period by brief exposure of light.
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C
It is not affected by interruption of long dark period by brief exposure of light.
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D
It is affected if the continuous light period is interrupted.
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Solution
The correct option is B It is affected by interruption of long dark period by brief exposure of light.
The plants that flower, when day length is less than a certain critical length, are called short-day plants. For example, Xanthium flower, Tobacco and Strawberry.
They cannot flower under short nights or if a pulse of artificial light is shone on the plant for several minutes during the night; they require a continuous period of darkness before floral development can begin. Natural nighttime light, such as moonlight or lightning, is not of sufficient brightness or duration to interrupt flowering.