Division in which the egg divides completely is known as

Options

A. Holoblastic
B. Meroblastic
C. Macroblastic
D. Blastogenic.

Answer

To solve the question "Division in which the egg divides completely is known as," we can follow these steps:

### Step 1: Understand the Types of Egg Division
There are different types of egg division based on how the cytoplasm and yolk are distributed during cleavage. The two main types are Holoblastic and Meroblastic divisions.

### Step 2: Define Holoblastic Division
Holoblastic division is characterized by the complete division of the egg. In this type of division, the entire egg divides into smaller cells (blastomeres), and this occurs when there is an even distribution of yolk throughout the egg.

### Step 3: Define Meroblastic Division
In contrast, Meroblastic division is an incomplete division of the egg. This occurs when there is a large amount of yolk present in the egg, making it difficult for the entire egg to divide completely. Only a part of the egg divides, while the yolk remains intact.

### Step 4: Analyze Other Options
- **Macroblastic**: Refers to abnormally large nucleated cells, not relevant to egg division.
- **Plastogenic**: Relates to the development of embryos during cleavage but is not a standard term for egg division.

### Step 5: Conclusion
Based on the definitions and characteristics of the divisions, the type of division in which the egg divides completely is known as **Holoblastic division**.

### Final Answer
The answer is **Option A: Holoblastic**.

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