Photosystem I (PS I) and photosystem II (PS I | vedclass

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(A) Photosystems are functional units of the light-dependent reactions of photosynthesis. Although $PS II$ functions first in the non-cyclic electron

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in the sequence of their discovery

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(A) Photosystems are functional units of the light-dependent reactions of photosynthesis. Although $PS II$ functions first in the non-cyclic electron transport chain ($Z$-scheme) to split water and provide electrons,it was discovered after $PS I$. Therefore,the naming of $PS I$ and $PS II$ is based on the chronological order of their discovery,not the order in which they function in the light reaction.

Photosystem $I$ $(PS I)$ and photosystem $II$ $(PS II)$ are named:

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