In centrolecithal eggs, the cleav age is

Options

A. Equal holoblastic
B. Unequal holoblastic
C. Unequal holoblastic
D. Meroblastic superficial.

Answer

To answer the question about the cleavage in centrolecithal eggs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Centrolecithal Eggs**:
- Centrolecithal eggs are characterized by having a large amount of yolk concentrated in the center of the egg. This type of egg is commonly found in many arthropods.

2. **Types of Cleavage**:
- Cleavage refers to the series of rapid cell divisions that occur after fertilization. There are different types of cleavage patterns based on the distribution of yolk and the resulting cell divisions:
- **Holoblastic Cleavage**: Complete division of the egg into smaller cells. This occurs in eggs with little yolk.
- **Meroblastic Cleavage**: Partial division of the egg, which is further categorized into:
- **Discoidal**: Division occurs only in a small disc of cytoplasm on top of the yolk.
- **Superficial**: Division occurs only in the outer layer of the egg, while the yolk remains undivided.

3. **Identifying the Cleavage Type in Centrolecithal Eggs**:
- In centrolecithal eggs, due to the large central yolk, the cleavage is not complete. Instead, the cleavage is superficial, meaning that the cell divisions occur only in the outer layer of the egg, surrounding the yolk.

4. **Conclusion**:
- Based on the characteristics of centrolecithal eggs and the type of cleavage they undergo, the correct answer is that the cleavage is **meroblastic superficial**.

### Final Answer:
The cleavage in centrolecithal eggs is **D) meroblastic superficial**.

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