During unfavourable condition, Amoeba reproduce by

Options

A. Binary fission
B. Multiple fission
C. Budding
D. Gemmule formation

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks how Amoeba reproduces during unfavorable conditions.

2. **Identifying Reproduction Methods**: The options provided are:
- Binary fission
- Multiple fission
- Budding
- Gemmule formation

3. **Analyzing Binary Fission**:
- Binary fission is a type of asexual reproduction where a single organism divides into two identical organisms.
- This method is common in favorable conditions and is not the correct answer for reproduction during unfavorable conditions.

4. **Exploring Multiple Fission**:
- Multiple fission is a process where an organism divides into many daughter cells simultaneously.
- In Amoeba, during unfavorable conditions, it undergoes a process called encystment, where it forms a protective cyst.

5. **Understanding Encystment**:
- During encystment, Amoeba secretes a thick, three-layered wall (cyst wall) from its pseudopodia.
- This cyst protects the Amoeba until favorable conditions return.

6. **Reproduction After Encystment**:
- Once favorable conditions are restored, the encysted Amoeba undergoes multiple fission.
- It divides to form numerous spores called pseudopodiospores, each of which can develop into a new Amoeba.

7. **Eliminating Other Options**:
- Budding is not correct as it typically occurs in favorable conditions and involves the formation of a new organism from a part of the parent organism.
- Gemmule formation is also incorrect as it occurs in sponges and is not a method used by Amoeba.

8. **Conclusion**: The correct answer is that Amoeba reproduces by multiple fission during unfavorable conditions.

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