During encystation, Amoeba withdraws its pseudopodia and secretes a ………... layered hard covering or cyst around itself.

Options

A. 5
B. 4
C. 2
D. 3

Answer

To solve the question regarding the encystation of Amoeba, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Encystation**:
- Encystation is a process that occurs when Amoeba faces unfavorable living conditions. During this time, it withdraws its pseudopodia (the temporary projections used for movement and feeding) to protect itself.

2. **Formation of Cyst**:
- As part of this protective mechanism, Amoeba secretes a hard covering around itself known as a cyst. This cyst serves as a protective barrier against harsh environmental conditions.

3. **Layers of the Cyst**:
- The question specifically asks about the number of layers in the cyst that Amoeba secretes during encystation. Research indicates that the cyst formed by Amoeba consists of three distinct layers.

4. **Identifying the Correct Option**:
- Given the options:
- Option 1: 5 layers
- Option 2: 4 layers
- Option 3: 2 layers
- Option 4: 3 layers
- Since we know that Amoeba secretes a three-layered cyst, the correct answer is **Option 4**.

5. **Conclusion**:
- In summary, during encystation, Amoeba forms a three-layered hard covering or cyst around itself to survive unfavorable conditions.

### Final Answer:
**The correct answer is Option 4: 3 layers.**