Effect of length of day (light duration) on flowering is called as

Phototropism

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Photoperiodism

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Photorespiration

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None of the above

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Solution

The correct option is B Photoperiodism
Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals. It can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.
So, the correct answer is option B.

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