A morula can be differentiated from blastula in

Options

A. absence of yolk
B. presence of cavity
C. absenceof cavity
D. presence of more yolk

Answer

To differentiate between a morula and a blastula, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cleavage**:
- After fertilization, the zygote undergoes a series of rapid mitotic divisions known as cleavage. This process transforms the single-celled zygote into multiple cells.

2. **Formation of Morula**:
- During cleavage, the zygote divides to form a solid ball of cells called the morula. This structure typically contains 8 to 16 cells, which are referred to as blastomeres.

3. **Characteristics of Morula**:
- The morula is a solid structure, meaning it does not contain any internal cavity. Thus, it is characterized by the absence of a cavity.

4. **Formation of Blastula**:
- As cleavage continues, the morula develops into a blastula (or blastocyst), which is a hollow structure. This stage features a fluid-filled cavity known as the blastocoel.

5. **Characteristics of Blastula**:
- The blastula has a distinct cavity (the blastocoel) and an inner cell mass, which is not present in the morula.

6. **Conclusion**:
- The primary difference between a morula and a blastula is the presence or absence of a cavity. The morula lacks a cavity, while the blastula contains a cavity.

### Final Answer:
A morula can be differentiated from a blastula in the **absence of cavity**.

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