Passive food ingestion in Amoeba is known as

Options

A. Import
B. Circumvallation
C. Circumfluence
D. Invagination

Answer

To answer the question about passive food ingestion in Amoeba, we need to analyze the options provided and determine which one correctly describes the process.

### Step-by-Step Solution:

1. **Understanding the Options**:
- We have four options: import, circumvallation, circumfluence, and invagination. Each term relates to different methods of food ingestion in Amoeba.

2. **Analyzing Each Option**:
- **Import**: This method involves the passive intake of food. When food comes into contact with the Amoeba, it can passively sink into the body by rupturing the plasma membrane. The rupture heals quickly, allowing the food to enter.
- **Circumvallation**: This process involves Amoeba actively engulfing prey, such as flagellates and ciliates, forming a food cup around the prey. This is an active process, not passive.
- **Circumfluence**: In this method, Amoeba extends its pseudopodia around motionless bacteria, forming an envelope that leads to the creation of a food vacuole. This is also an active process.
- **Invagination**: Here, the ectoplasm secretes a sticky substance that helps food adhere. The ectoplasm then forms a tube that eventually becomes a food vacuole. This is also an active process.

3. **Identifying the Correct Answer**:
- Based on the definitions and processes described, **import** is the only method that describes a passive way of food ingestion in Amoeba. The other options involve active processes.

4. **Conclusion**:
- Therefore, the correct answer to the question is **import**.

### Final Answer:
Passive food ingestion in Amoeba is known as **import**.