A) phytochrome
B) cytochrome
C) ferredoxin
D) plastocyanin
Correct Answer: A
Solution :
Photoperiodism is the effect of duration of light and darkness on the growth, development and behaviour of organisms. Such photoperiodic response of red and. far-red wavelength is mediated by phytochrome. It is especially connected with flowering of plants. Plastocyanin (PC) is a copper-binding small peripheral protein that is able to diffuse freely along the luminal surface of the thylakoid membrane. It is an electron carrier in photophosphorylation. Ferredoxin is Fe-S protein and used to reduce \[\text{NAD}{{\text{P}}^{\text{+}}}\] a reaction mediated by ferredoxin- \[\text{NAD}{{\text{P}}^{\text{+}}}\]oxidoreductase. Cytochrome is a Fe containing protein used as electron carrier in oxidative phosphorylation.
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