Assertion : In animal cells, first phase in breakdown of glucose is Krebs' cycle.
Reason : EMP pathway is another name for Krebs' cycle.

Options

A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
C. If Assertion is true 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 1: Analyze the Assertion
The assertion states: "In animal cells, the first phase in the breakdown of glucose is the Krebs' cycle."
- This statement is **incorrect**. The first phase in the breakdown of glucose is glycolysis, not the Krebs' cycle. Glycolysis occurs in the cytoplasm and converts glucose into pyruvate, releasing a small amount of energy.

### Step 2: Analyze the Reason
The reason states: "EMP pathway is another name for the Krebs' cycle."
- This statement is also **incorrect**. The EMP pathway, or Embden-Meyerhof-Parnas pathway, is another name for glycolysis, not the Krebs' cycle. The Krebs' cycle (also known as the citric acid cycle) occurs after glycolysis and takes place in the mitochondria.

### Step 3: Determine the Relationship Between Assertion and Reason
Since both the assertion and the reason are false, we can conclude that:
- The assertion is false because the first phase of glucose breakdown is glycolysis, not the Krebs' cycle.
- The reason is false because the EMP pathway refers to glycolysis, not the Krebs' cycle.

### Conclusion
Since both the assertion and the reason are false, the correct answer is: **Both assertion and reason are false.**

### Final Answer
The correct option is: **Option 4: Both assertion and reason are false.**

---