The embryo with 8 to 16 blastomeres is called :

Options

A. Moruls
B. Blastula
C. Gastrula
D. Foetus

Answer

To solve the question regarding the embryo with 8 to 16 blastomeres, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to understand what blastomeres are. Blastomeres are the cells that are formed by the division of a fertilized egg (zygote) during the early stages of embryonic development.

2. **Identifying the Stages of Development**:
- After fertilization, the zygote undergoes a series of mitotic divisions known as cleavage. This process leads to the formation of multiple cells.
- The first few divisions result in the formation of 2, 4, 8, and then 16 cells.

3. **Defining the Morula Stage**:
- When the embryo reaches the stage of having 8 to 16 blastomeres, it is referred to as the morula. The morula is a solid ball of cells that forms before the embryo develops into a blastocyst.

4. **Other Stages for Comparison**:
- The next stage after the morula is the blastula, which has a larger number of cells and forms a hollow structure.
- Gastrula is a later stage that involves the formation of germ layers.
- Fetus refers to a much later stage of development after the embryonic stages.

5. **Conclusion**:
- Based on the definitions and stages discussed, the correct answer to the question is that the embryo with 8 to 16 blastomeres is called a **morula**.

### Final Answer:
The embryo with 8 to 16 blastomeres is called **morula**.

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