The table shows the direction and function of substances in a chemical reaction that takes place in the chloroplasts of plant cells. The table is missing information at W, X, and Y.

Without more information or context, it is not possible to determine what substance W is.

Without the complete table, it is not possible to determine the specific substance W. Substance W could represent a reactant, product, catalyst, or any other substance involved in the chemical reaction taking place in the chloroplasts of plant cells. Can you please provide the complete table or more information about the specific chemical reaction?

To determine what substance W is in the given table, we need to understand the direction and function of substances in a chemical reaction that takes place in the chloroplasts of plant cells.

Without the table provided, we can still explain what substance W is likely to be based on the general knowledge of the functions of substances in the chloroplast.

In chloroplasts, one of the essential processes is photosynthesis, which involves the conversion of light energy into chemical energy. During this process, light is absorbed by chlorophyll molecules, which are located in the thylakoid membranes inside the chloroplasts.

Substance W, therefore, is likely to be the light energy that is absorbed by chlorophyll molecules during the process of photosynthesis. It is important to note that light energy, being a form of energy, does not have a specific physical substance associated with it. Instead, it is the electromagnetic radiation that is used by chlorophyll molecules to drive the chemical reactions of photosynthesis.

To verify this answer, it would be helpful to refer to the provided table, which should contain information about the other substances and their functions and directions in the chemical reaction.