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  • Phytochrome is aOption: 1 flavoproteinOption: 2 g

Phytochrome is a

Option: 1

flavoprotein


Option: 2

glycoprotein


Option: 3

lipoprotein


Option: 4

chromoprotein


Answers (1)

best_answer

Phytochromes and their effects -

  • It is observed that that a brief exposure with red light during critical dark period inhibits flowering in a short day plant and this inhibitory effect can be reversed by a subsequent exposure to far-red light.
  • Similarly, prolongation of the critical light period or the interruption of the dark period stimulates flowering in long-day plants.
  • This inhibition of flowering in short day plant and stimulation of flowering in long day plants involves the operation of a proteinaceous pigment called phytochrome. 
  • Phytochromes are the chemicals which perceive the photoperiodic stimulus.
  • The wavelength of light is perceived by the leaves. 
  • A defoliated plant does not flower.
  • A single leaf is sufficient to stimulate the flowering.
  • Phytochrome is present in roots, coleoptiles, stems, hypocotyls, cotyledons, petioles, leaf blades, vegetative buds, flower tissues, seeds and developing fruits of higher plants. 
  • Proteins having pigmented prosthetic group are referred to as chromoproteins. Phytochrome is a chromoprotein, e.g., phytochrome A and phytochrome B that regulate flowering in plants by under different light conditions by absorption of red or far-red light by their pigment. 

-Hence, the correct answer is option d.

 

 

 

Posted by

Kuldeep Maurya

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