In Amoeba , encystation is

Options

A. withdrawal of pseudopodia and secretes a one - layerd hard covering or cyst around itself.
B. withdrawal of pseudopodia and secretes a two - layerd hard covering or cyst around itself.
C. withdrawal of pseudopodia and secretes a three - layerd hard covering or cyst around itself.
D. withdrawal of pseudopodia and secretes a four - layerd hard covering or cyst around itself.

Answer

### Step-by-Step Solution:

1. **Understanding Encystation**: Encystation in Amoeba refers to the process by which the organism forms a protective cyst in response to unfavorable environmental conditions.

2. **Response to Unfavorable Conditions**: When Amoeba encounters harsh conditions (such as lack of food, extreme temperatures, or desiccation), it initiates a series of changes to protect itself.

3. **Withdrawal of Pseudopodia**: The first step in this process is the withdrawal of its pseudopodia. Pseudopodia are temporary projections of the cell that help in movement and feeding. In unfavorable conditions, Amoeba retracts these structures.

4. **Formation of a Protective Layer**: After the withdrawal of pseudopodia, Amoeba secretes a protective covering. This covering is a cyst that serves to protect the organism from the harsh external environment.

5. **Three-Layered Cyst**: The cyst formed is not just a single layer; it consists of three distinct layers. This multi-layered structure provides enhanced protection against environmental stressors.

6. **Final Structure**: The final structure is a hard, three-layered sheath that encases the Amoeba, allowing it to survive until conditions improve.

7. **Conclusion**: Based on the understanding of the process of encystation in Amoeba, the correct answer to the question regarding the nature of the cyst is that it is a three-layered structure.