In the context of photosynthesis, the substances involved include carbon dioxide (CO2), water (H2O), glucose, and oxygen (O2). Typically, in diagrams summarizing photosynthesis, the general equation is:
6 CO2 + 6 H2O → C6H12O6 + 6 O2
If "Y" is meant to represent one of the reactants or products in the photosynthesis process, it would depend on where "Y" is placed in the diagram. However, commonly, if "Y" were to represent the products of photosynthesis, it would likely be:
- c. glucose (C6H12O6) if it refers to the product, or
- a. O2 (oxygen) if it refers to another product.
If "Y" represents a reactant, it could either refer to:
- b. H2O (water) or
- d. CO2 (carbon dioxide).
Could you please provide more context or details about the diagram to determine what substance "Y" refers to?