Effect of the day length duration on plant development and flowering is

Chemtropism

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Phototropism

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Photoperiodism

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Photonasty

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Solution

The correct option is D Photoperiodism
Effect of the day length duration on plant development and flowering is called photoperiodism. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark period.
Plants have been classified under three groups according to photoperiods. They are short-day plants, long-day plants and day-neutral plants.
So, the correct answer is 'Photoperiodism'.

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