First slide

Photoperiodism

Question

In order to initiate flowering, short day plants require:

Easy

A

Exposure to light for a period less than the critical duration
B

Exposure to light for a period more than the critical duration
C

Exposure to light for a period much more than the critical duration
D

Exposure to light for a period equal to the critical duration

Solution

Some plants require the exposure to light for a period exceeding a well defined critical
duration, while others must be exposed to light for a period less than this critical duration before the flowering is initiated in them. The former group of plants are called long day plants while the latter ones are termed short day plants.

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