A) PS-I
B) PS-II
C) phytochrome
D) phycocyanin
Correct Answer: B
Solution :
The photochemical reaction (light reaction) includes photosystem-I and photosystem-II. When pigments of PS II absorb light, electrons. are released from this and thus chlorophyll molecules get oxidised. The oxidized chlorophyll take electrons from OH and again reduced. The \[O{{H}^{-}}\] comes from photolysis of water. \[\begin{align} & \underline{\begin{align} & 4{{H}_{2}}O~\xrightarrow{{}}4{{H}^{+}}+4O{{H}^{-}} \\ & 4O{{H}^{-}}\xrightarrow{{}}~4OH+4{{e}^{-}} \\ & 4OH\xrightarrow{{}}2{{H}_{2}}+{{O}_{2}} \\ \end{align}} \\ & 2{{H}_{2}}O\xrightarrow{{}}{{O}_{2}}+4{{H}^{+}}+4{{e}^{-}} \\ \end{align}\] In this process manganese ions, chloride and bicarbonate play important role. PS-I has cyclic photophosphorylation and leads 10 synthesis of ATP. Phycocyanin is the characteristic pigment of blue green algae (cyanobacteria). Phytochrome is a bright blue or bluish green protein having two inter-convertable forms. \[-{{P}_{R}}\] and \[{{P}_{FR}}\].
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