Answer :

Flowering in certain plants at a given place depends not only on a combination of height and dark exposures but also their relative duration. For flowering both the duration of light and the duration of darkness are equally important. Some plants require the exposure to light for a period exceeding a well defined critical duration; such plants are short day plants. Certain other plants must be exposed to light for a period less than the critical duration before flowering is initiated & such plants are long day plants.

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