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Plant Growth and Development
Question
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The plants respond to photoperiods due to the presence of :

  • enzymes

  • stomata

  • phytochromes

  • phytohormones

Answer

C.

phytochromes

Photoperiodism is the response of an organism to seasonal changes in day length.

It is regulated by the photoreversible pigment called phytochrome. Phytochrome is a photoreceptor chromoprotein.

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