MediumNEET TEST
+4 / -1
Identify the correct statement regarding the Z scheme of light reaction of photosynthesis.
A
It occurs in the stroma lamellae.
B
The characteristic shape is formed when all electron carriers are placed in a sequence on a light intensity scale.
C
It starts with PS I, moves uphill to an acceptor, then downhill to PS II, and finally to NADP+.
D
It leads to production of ATP and NADPH + H+.
Explanation
The whole scheme of transfer of electrons, starting from the PS II, uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally down hill to NADP+ reducing it to NADPH + H+ is called the Z scheme, due to its characterstic shape. The Z scheme (non-cyclic photophosphorylation) occurs in the grana thylakoids. The stroma lamellae lack Photosystem II (PS II) and the NADP reductase enzyme, so only cyclic photophosphorylation occurs there. The characteristic "Z" shape is formed when the electron carriers are placed in sequence according to their redox potential (oxidation-reduction potential), not a light intensity scale. The Z scheme involves both PS II and PS I working in series. This non-cyclic flow of electrons results in the photolysis of water (releasing oxygen), the synthesis of ATP, and the reduction of NADP+ to NADPH + H+.
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