The reactions that produce molecular oxygen (O₂)take place in
A) the light reactions alone.
B) the Calvin cycle alone.
C) both the light reactions and the Calvin cycle.
D) neither the light reactions nor the Calvin cycle.
E) the chloroplast, but are not part of photosynthesis.

Question

Quizplus · Accepted Answer

Molecular oxygen (O₂) is produced only in the light reactions of photosynthesis, specifically through the process of photolysis in which water molecules are split into oxygen, hydrogen ions, and electrons. The Calvin cycle is dependent on the products of the light reactions (ATP and NADPH), but does not produce molecular oxygen.

The Reactions That Produce Molecular Oxygen (O₂)take Place in