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  4. Non-cyclic photophosphorylation is performed by: (1) dark reaction (2) PS-I (3) only PS-I (4) PS-II

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Q. Non-cyclic photophosphorylation is performed by:
(1) dark reaction
(2) PS-I
(3) only PS-I
(4) PS-II

BHUBHU 2005

Solution:

Non-cyclic photophosphorylation is carried out in collaboration of both photosystems-I and II. Electrons released during photolysis of water are picked up by photocentre of PS-II called $P _{680}$. The same is extruded out when the photocentre absorbs light energy $(hv.)$ The extruded electron has an energy equivalent to $23 \,kcal / mole$. It passes through ' a series of electron carriers-Phaeophytin, $PQ$ cytochrome $b-f$ complex and plastocyanin. while passing over cytochrome complex, the electron loses sufficient energy for the synthesis of ATP. The electron is handed over to photocentre $P_{700}$ of PS-I (One) by plastocyanin.