Which of the following is not true for gastrula stage of embryonic development in human ?

Options

A. Morphogenic movement of blastomere
B. Formation of blastocyst with fluid filled cavity
C. Formation of three primary germinal layers
D. Formation of epiblast and hypoblast form germinal disc

Answer

To solve the question regarding which statement is not true for the gastrula stage of embryonic development in humans, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Gastrula Stage**:
- The gastrula stage is a critical phase in embryonic development where the three germ layers (ectoderm, mesoderm, and endoderm) are formed. This stage follows the blastula stage.

2. **Evaluating the Options**:
- **Option 1**: Morphogenic movement of blastomeres occurs.
- This statement is true. During the gastrula stage, there is indeed morphogenic movement of blastomeres as they differentiate into the three germ layers.

- **Option 2**: Formation of the blastocyst with a fluid-filled cavity.
- This statement is false. The blastocyst stage, which includes a fluid-filled cavity known as the blastocoel, occurs before the gastrula stage. Therefore, this is the correct answer to the question as it is not true for the gastrula stage.

- **Option 3**: Formation of the three primary germ layers (ectoderm, mesoderm, and endoderm).
- This statement is true. The formation of these three germ layers is a defining characteristic of the gastrula stage.

- **Option 4**: Formation of the epiblast and hypoblast forming the germinal disc.
- This statement is also true. The gastrula stage involves the formation of the epiblast and hypoblast, which contribute to the germinal disc.

3. **Conclusion**:
- The statement that is not true for the gastrula stage is **Option 2**: "Formation of the blastocyst with a fluid-filled cavity."

### Final Answer:
**Option 2** is not true for the gastrula stage of embryonic development in humans.

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