During the 'Z' scheme of Photosynthesis electrons of which of these reduce NADP⁺

Concept-

• Light reactions or the ‘Photochemical’ phase include light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates, ATP and NADPH.
• 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 downhill to NADP+ reducing it to NADPH + H+ is called the Z scheme, due to its characteristic shape.
• During the 'Z' scheme of Photosynthesis, it is the electrons from Photosystem I (PSI) which ultimately reduce NADP+ to NADPH

Explanation-

• The splitting of water in the presence of sunlight is called photolysis.
• It occurs during non-cyclic photophosphorylation.
• It results in the supply of electrons to PSII and the protons to NADP⁺.
• O₂ is liberated during this process. 
• Electrons released from water finally reach NADP⁺ through PSII and PSI. Thus NADP⁺ is reduced to NADPH + H⁺.

Important Points

• The NADP reductase enzyme is located on the stromal side of the membrane. Along with electrons that come from the acceptor of electrons of PS I, protons are necessary for the reduction of NADP+ to NADPH+ H+. These protons are also removed from the stroma.