A) phytochrome
B) carotene
C) cytochrome
D) xanthophylls
Correct Answer: A
Solution :
Phytochrome is a proteinaceous pigment, which exists in two forms- (i) Red light absorbing from \[{{\text{P}}_{\text{r}}}\] and (ii) far-red light absorbing from\[{{\text{P}}_{\text{fr}}}\] These two forms are photochemically in terconvertible\[_{\begin{smallmatrix} \text{Red} \\ \text{light} \end{smallmatrix}}^{{{\text{P}}_{\text{R}}}}_{\begin{smallmatrix} \text{Far-red} \\ \text{light} \end{smallmatrix}}^{{{\text{P}}_{\text{Fr}}}}\]
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