Two formative movements that take place during gastulation are

Options

A. Involutin and invagination
B. Epiboly and emboly
C. Invagination and ingression
D. Ingression and delamination.

Answer

To answer the question regarding the two formative movements that take place during gastrulation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Gastrulation**: Gastrulation is a crucial phase in embryonic development where the single-layered blastula reorganizes into a multilayered structure known as the gastrula. This process involves significant cellular movements and changes.

**Hint**: Remember that gastrulation leads to the formation of the three germ layers: ectoderm, mesoderm, and endoderm.

2. **Identify Formative Movements**: During gastrulation, several key movements occur. The question asks for two specific formative movements.

**Hint**: Focus on the movements that contribute to the organization of the germ layers.

3. **Review the Options**: The options provided are:
- A. Involution, Involutene and Invagination
- B. Epiboli and Amboli
- C. Invagination and Ingression
- D. Ingression and Delamination

**Hint**: Look for movements that are commonly associated with the rearrangement of cells during gastrulation.

4. **Analyze Each Option**:
- **Option A**: Involution and Invagination are indeed movements associated with gastrulation, but "Involutene" is not a recognized term.
- **Option B**: Epiboli and Amboli are mentioned, but "Amboli" is not a standard term in gastrulation.
- **Option C**: Invagination and Ingression are both recognized movements during gastrulation.
- **Option D**: Ingression and Delamination are also valid movements.

**Hint**: Check which movements are most commonly discussed in the context of gastrulation.

5. **Determine the Correct Answer**: The most recognized formative movements during gastrulation are **Invagination** and **Ingression**. Therefore, the correct answer is **Option C: Invagination and Ingression**.

**Hint**: Recall that invagination involves the inward folding of a cell sheet, while ingression involves individual cells moving into the interior.

### Final Answer:
The two formative movements that take place during gastrulation are **Invagination and Ingression** (Option C).