Plant Cells Release Hydrogen Ions and Oxygen from H₂O Molecules

Question

Plant cells release hydrogen ions and oxygen from H2O molecules in ____.  
A) photosystem I
B) photosystem II
C) cyclic photophosphorylation
D) the light independent reaction
E) carbon fixation

Accepted Answer

Photosystem II is responsible for splitting water molecules during photosynthesis. The hydrogen ions are used to create a proton gradient that powers ATP synthesis, while the oxygen is released as a byproduct.