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.

Based on the given information, it is not possible to determine the substance W without further information.

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

In chloroplasts, a process called photosynthesis occurs. It is the process through which plants convert sunlight, carbon dioxide, and water into glucose (sugar) and oxygen.

Looking at the options provided:
a) Methane: Methane is not typically involved in the process of photosynthesis in plants.
b) Minerals: While minerals are necessary for plant growth, they are not directly involved in the photosynthesis reaction taking place in chloroplasts.
c) Sunlight: Sunlight is one of the key components required for photosynthesis. It provides the energy needed for the reaction to occur.
d) Starch: Starch is a complex carbohydrate that is produced through the process of photosynthesis. It serves as a storage form of glucose in plant cells.

Based on this information, the substance W would likely be sunlight (option c). Sunlight provides the energy needed for the photosynthesis reaction to occur in the chloroplasts of plant cells.

Substance W in the chemical reaction that takes place in the chloroplasts of plant cells can be inferred from the given options. However, since the table does not provide enough information, it is not possible to determine the exact substance W.