Question

where do the protons that drive chemiosmosis in photosynthesis come from?
a glucose
b o₂
c nadph
d h₂o

Explanation:

In photosynthesis, during the light - dependent reactions, water (\(H_2O\)) is split. This process, known as photolysis of water, releases protons (\(H^+\)). These protons contribute to the proton gradient that drives chemiosmosis. Glucose is a product of the light - independent reactions (Calvin cycle) and not a source of protons for chemiosmosis. \(O_2\) is a by - product of water splitting (not a proton source). NADPH is a product formed when \(NADP^+\) accepts electrons and protons, but it is not the original source of protons for chemiosmosis.

Answer:

d. \(H_2O\)