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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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The site of perception of light in plants during photoperiodism is:

The site of perception of light in plants for flowering is

In some plants,flowering is induced by exposure to low temperatures,either quantitatively or qualitatively. This phenomenon is known as $........$.

Vernalization increases the resistance of plants for diseases caused by . . . . . . .

Assertion $(A)$: Vernalization is acceleration of subsequent flowering by low temperature treatment.
Reason $(R)$: Site of vernalization is apical meristem.

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