Question

most atmospheric oxygen comes from photosynthesis. from which of the following molecules is the oxygen derived? multiple choice chlorophyll a glucose carbon dioxide chlorophyll b water

Explanation:

In the light - dependent reactions of photosynthesis, water is split (photolysis). Oxygen is released as a by - product from the splitting of water molecules. Chlorophylls (a and b) are pigments that absorb light energy. Carbon dioxide is used to make glucose during the Calvin cycle, and oxygen is not derived from glucose or carbon dioxide in the process of producing atmospheric oxygen from photosynthesis.

Answer:

E. water