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(D) The correct answer is $D$. Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. Plants perceive the

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Photoperiod

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(D) The correct answer is $D$. Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. Plants perceive the duration of light and dark periods,which triggers the production of a hypothetical flowering hormone called 'florigen'. This hormone is transported to the shoot apices to induce the transition from vegetative growth to flowering in angiospermic plants.

Which of the following factors influence the process of flowering?

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