Question

question 5
1 pts
electrons lost from photosystem i during the light reactions are replaced by electrons from:
nadph
glucose
atp
water
photosystem ii

Explanation:

During the light reactions of photosynthesis, electrons lost from Photosystem I are replaced by electrons from Photosystem II. In the non - cyclic electron flow (the Z - scheme), electrons move from water (via Photosystem II) to Photosystem I. Photosystem II splits water (photolysis of water) to get electrons. These electrons pass through an electron transport chain and then are used to replenish the electrons lost by Photosystem I. NADPH is a product of the light reactions (formed when electrons are transferred to NADP+). Glucose is a product of the Calvin cycle (dark reactions). ATP is also a product of the light reactions (through chemiosmosis), but it does not donate electrons to Photosystem I.

Answer:

Photosystem II