How much glucose and oxygen is needed in photosynthesis?

Well, to start off, neither glucose nor oxygen are needed to perform photosynthesis.

They are both, in fact, byproducts of this process. During photosynthesis, glucose is made and used as a food source for plants. The oxygen is given off as a waste product. Photosynthesis does need some very important substances. One of which is Sunlight. Another is Water. But the third factor is Carbon Dioxide, not oxygen. Without these things, the plant could not survive.