Anton thinks that glucose is a reactant of photosynthesis, but his classmate jamila disagrees. who is correct, and why? 1. anton is correct because glucose is a substance that is present before the chemical reaction of photosynthesis takes place. 2. anton is correct because glucose is a substance that is formed from the chemical reaction of photosynthesis. 3. jamila is correct because glucose is a product, not a reactant, of photosynthesis. 4. jamila is correct because glucose is not involved in the chemical reaction of photosynthesis.