Most atmospheric oxygen comes from photosynthesis.From which of the following molecules is the oxygen derived?
A)water
B)carbon dioxide
C)glucose
D)chlorophyll a
E)chlorophyll b

Question

Quizplus · Accepted Answer

Atmospheric oxygen is primarily produced by photosynthetic organisms, such as plants and algae, through the process of photosynthesis. During photosynthesis, these organisms use energy from the sun to convert carbon dioxide and water into glucose (sugar) and oxygen. The oxygen released during photosynthesis comes from the water molecule, not from carbon dioxide or any of the other molecules listed. Thus, the correct answer is A) water.

Most Atmospheric Oxygen Comes from Photosynthesis