In insect egg, cleavage is

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Insect Eggs**:
- Insect eggs have a significant amount of yolk concentrated in the center. The nucleus is located in a net-like structure surrounding the yolk.

2. **Identifying the Type of Cleavage**:
- Cleavage refers to the division of cells after fertilization. In insects, the cleavage is characterized as **partial or incomplete**.

3. **Defining Meroblastic Cleavage**:
- Since the cleavage is partial, it is termed **meroblastic**. This means that only a part of the egg undergoes cleavage, while the rest remains intact.

4. **Understanding Superficial Cleavage**:
- In addition to being meroblastic, the cleavage in insect eggs is also described as **superficial**. This means that the cell divisions occur at the surface of the egg, rather than throughout the entire volume.

5. **Cytokinesis in Insect Eggs**:
- It is important to note that in this type of cleavage, **cytokinesis** (the division of the cytoplasm) does not occur in the usual manner. This leads to the formation of **polynuclear** egg cells, where multiple nuclei are present within a single cell.

6. **Evaluating the Options**:
- The question provides multiple-choice options:
- Equal and holoblastic
- Unequal holoblastic
- Meroblastic and superficial
- Meroblastic discoidal
- Based on the characteristics discussed, the correct answer is **meroblastic and superficial**.

### Final Answer:
The cleavage in insect eggs is **meroblastic and superficial**.

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