Question 11
The correct sequence of flow of electrons in the light reaction is
(a) PS II, plastoquinone, cytochromes, PS I ferredoxin
(b) PS I, plastoquinone, cytochromes, PS II, ferredoxin
(c) PS I, ferredoxin, PS II
(d) PS I, plastoquinone, cytochromes, PS II, ferredoxin

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Solution

a) Light reactions occur inside thylakoids. It is dependent upon light. It involves photolysis of water (breaking of water into H2 and O2 and production of assimilation power (NADPH and ATP). An electron released during the photolysis of water is picked up by the P680 photo centre of photosystem II. From here electrons passes over a series of carrier which includes PQ, cytochrome b-f complex, and PC. While passing over the cytochrome complex, the electron loses sufficient energy for the creation of proton gradient and ATP from ADP and inorganic phosphate. From PC electron loses sufficient energy for the creation of proton gradient and ATP from ADP and inorganic phosphate. From PC electron is picked by the trap centre P700of photosystem I, which pushes out electron after absorbing light energy. Electron passes over carriers FeS, ferredoxin and NADP reductase which gives an electron to NADP+ for combing with H+ to produce NADPH.
So, answer is (a) PS II, plastoquinone, cytochromes, PS I ferredoxin

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Splitting of water molecules during light reaction of photosynthesis is associated with

(a) PS I resulting in the release of $O_{2}$ , protons and transfer of electrons to PS II

(b) PS II resulting in release of $O_{2}$ , protons and transfer of electrons to PS I

(d) PS I resulting in the release of $O_{2}$ , protons and transfer of electrons to PS I.

Of the above statements

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