The hypoblast (inner germ layer of gastrula) forms the

Options

A. Ectoderm
B. Mesoderm
C. Endoderm
D. None of the above.

Answer

To answer the question regarding what the hypoblast (inner germ layer of the gastrula) forms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Germ Layers**: In embryonic development, there are three primary germ layers: ectoderm, mesoderm, and endoderm. Each of these layers gives rise to different tissues and organs in the body.

2. **Identify the Hypoblast**: The hypoblast is also known as the primitive endoderm. It is one of the two layers formed from the inner cell mass during the early stages of embryogenesis.

3. **Role of the Hypoblast**: The hypoblast contributes to the formation of the endoderm layer. The endoderm is responsible for forming the lining of the gastrointestinal tract and other internal organs.

4. **Differentiate Between Ectoderm and Endoderm**: The other layer formed from the inner cell mass is the epiblast, which eventually gives rise to the ectoderm and mesoderm. The hypoblast does not contribute to these layers.

5. **Conclusion**: Since the hypoblast is associated with the formation of the endoderm, the correct answer to the question is option C: Endoderm.

### Final Answer:
The hypoblast (inner germ layer of gastrula) forms the **endoderm**.

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