Sammy is taking notes to study for a test. He wrote out the steps that involve hydrogen during photosynthesis. The steps are shown, but they are not in the correct order. 1 - Water is broken down into oxygen and hydrogen. 2 - Glucose is broken down to be used by plants. 3 - Hydrogen combines with carbon dioxide to form glucose. 4 - Hydrogen enters the plant as part of water. The correct order of the steps is 4, 1, 3, 2.

Anton thinks that glucose is a reactant of photosynthesis, but his classmate Jamila disagrees. Jamila is correct because glucose is a product, not a reactant, of photosynthesis.

Li Ming thinks that chlorophyll is a reactant of photosynthesis, but her classmate Julian disagrees. Li Ming is correct because chlorophyll is a substance that is present before the chemical reaction of photosynthesis takes place.

Julian is correct. Chlorophyll is not a reactant of photosynthesis.

In an equation for photosynthesis, the glucose is: on the right, because it is a product.