Assertion : Nucleocytoplasmic ratio decreases in cleavage .
Reason : During cleavage , cytoplasmic synthesis is faster than DNA synthesis.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False .
D. If both Assertion & Reason are False.

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- The assertion states that "Nucleocytoplasmic ratio decreases in cleavage."
- The nucleocytoplasmic ratio (N/C ratio) refers to the ratio of the nucleus size to the cytoplasm size in a cell.
- During cleavage, the zygote undergoes a series of rapid cell divisions (cleavage divisions) without significant growth in cytoplasmic volume. This means that the cells produced are smaller than the original zygote.

2. **Analyzing the N/C Ratio:**
- As cleavage progresses, the size of the cells decreases because the cytoplasm is divided among more cells.
- Since the nucleus remains relatively constant in size while the cytoplasm is divided, the N/C ratio actually increases, not decreases.
- Therefore, the assertion is **false**.

3. **Understanding the Reason:**
- The reason states that "During cleavage, cytoplasmic synthesis is faster than DNA synthesis."
- In reality, during cleavage, the cell undergoes rapid divisions where DNA replication occurs before each division.
- The synthesis of cytoplasmic components does not outpace the DNA synthesis; rather, the two processes are tightly regulated to ensure proper cell division.
- Therefore, the reason is also **false**.

4. **Conclusion:**
- Both the assertion and the reason are false statements.
- Hence, the correct answer is that both statements are false.

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