To determine which substance is represented by [tex]\(X\)[/tex] in the word equation:
[tex]\[ \text{glucose} + X \rightarrow \text{enzymes} \rightarrow \text{water} + \text{carbon dioxide} + \text{ATP} \][/tex]
we need to analyze the equation and understand the biological process it represents.
### Step-by-Step Solution:
1. Identify the process:
- The equation involves glucose reacting with a substance [tex]\(X\)[/tex] in the presence of enzymes to produce water, carbon dioxide, and ATP (adenosine triphosphate).
- This set of products is characteristic of cellular respiration, a process that generates energy for cells.
2. Understand Cellular Respiration:
- Cellular respiration is the process by which cells convert glucose and oxygen into energy (ATP), water, and carbon dioxide.
- The general chemical equation for cellular respiration can be represented as:
[tex]\[ \text{glucose} + \text{oxygen} \rightarrow \text{water} + \text{carbon dioxide} + \text{ATP} \][/tex]
3. Substitute the known details:
- Given the equation in the problem, glucose is a reactant.
- The products (water, carbon dioxide, and ATP) are consistent with what cellular respiration produces.
4. Determine [tex]\(X\)[/tex]:
- In the context of cellular respiration, the missing reactant [tex]\(X\)[/tex] must be oxygen because oxygen is essential for breaking down glucose during this process.
5. Match the choices with the substance:
- Let's review the choices provided:
1. Alcohol
2. Chlorophyll
3. Oxygen
4. Lactic acid
- Cellular respiration specifically requires oxygen. Therefore, the correct answer must be oxygen.
Therefore, the substance represented by [tex]\(X\)[/tex] in the word equation is oxygen.
The correct choice is:
3) oxygen
