Cytokinesis in animals takes place by

Options

A. invagination
B. cell plate formation
C. both (1) and (2)
D. centrifugal method

Answer

### Step-by-Step Solution:

1. **Understanding Cytokinesis**:
- Cytokinesis is the process that occurs at the end of cell division (either mitosis or meiosis) where the cytoplasm of a parental cell is divided into two daughter cells.

2. **Identifying the Mechanism in Animals**:
- In animal cells, cytokinesis occurs through a specific mechanism known as invagination. This is where the cell membrane is pinched inwards to form two separate cells.

3. **Explaining Invagination**:
- During invagination, the cell membrane begins to fold inward at the center of the cell. This inward folding creates a cleavage furrow that deepens until the cell is pinched into two separate daughter cells.

4. **Understanding Forces Involved**:
- The process involves centripetal force, which pulls the membrane inward, facilitating the invagination. This is different from centrifugal force, which would push outward.

5. **Evaluating the Options**:
- The options provided were:
- A) Invagination
- B) Cell plate formation
- C) Both 1 & 2
- D) Centrifugal method
- Since cytokinesis in animals occurs by invagination, the correct answer is **A) Invagination**.

### Final Answer:
Cytokinesis in animals takes place by **invagination**.

---