Question

Photosynthesis by bacteria produced ______ as a waste product. A. Glucose B. Carbon Dioxide C. Oxygen D. All of these are produced by photosynthesis

Answer 1

Its mostly oxygen, glucose is rarely produced

Answer 2

remember that photosynthesis can be shown as
\[\sf 6CO_2+6H_2O + h \rightarrow C_6H_{12}O_6+6O_2\]

Answer 3

\(\color{blue}{\text{Originally Posted by}}\) @insa
Its mostly oxygen, glucose is rarely produced
\(\color{blue}{\text{End of Quote}}\)

Production of glucose is the goal of photosynthesis. See the reaction by @agreene . Oxygen is the waste product and thus is liberated.