Assertion : Completion of one molecule yields 28 molecules of ATP .
Reason : Incomplete oxidation of glucose in muscle cells during active exercise leads to a build up of ethyl alcohol.

Options

A. If both Assertion and Reason are true and Reason is a correct explaintion of Assertion .
B. If both assertion and Reason are ture Reason are ture Reason is not a correct explanation of Assertion .
C. If Assertion is ture but Reason is false .
D. If both assertion and Reason are false .

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the completion of one molecule yields 28 molecules of ATP.
- In cellular respiration, the complete oxidation of one molecule of glucose (C6H12O6) typically yields 38 molecules of ATP under aerobic conditions, not 28. Therefore, this assertion is incorrect.

2. **Understanding the Reason**:
- The reason states that incomplete oxidation of glucose in muscle cells during active exercise leads to a build-up of ethyl alcohol.
- During intense exercise, when oxygen is limited, muscle cells undergo anaerobic respiration, which leads to the production of lactic acid (not ethyl alcohol) in humans. Ethyl alcohol (ethanol) is produced in yeast during fermentation, not in muscle cells. Thus, this reason is also incorrect.

3. **Conclusion**:
- Since both the assertion and the reason are incorrect, we can conclude that the correct answer is that both the assertion and the reason are false.

### Final Answer:
Both assertion and reason are false.