In photosynthesis, what is the role of water H2O) ?
A) It accepts electrons liberated from the reaction centre of photosystem I.
B) It provides O2, the terminal electron acceptor for the electron transport chain.
C) It allows cyclic photophosphorylation to occur when ATP levels are low in the stroma.
D) It donates electrons to replace lost electrons in the reaction centre of photosystem II.
E) It provides the necessary H+ ions needed to reduce glyceraldehyde- 3- phosphate G3P) .
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