Common trait between Amoeba and leucocyte is

Options

A. Encystment
B. Pseudopodia
C. Sporulation
D. Contractile vacuole.

Answer

To find the common trait between Amoeba and leukocytes (white blood cells), we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Understand the Organisms**:
- **Amoeba**: A unicellular eukaryotic organism that moves and feeds using extensions of its cytoplasm called pseudopodia.
- **Leukocytes**: Also known as white blood cells, they are part of the immune system and help the body fight infections.

2. **Analyze the Options**:
- **Encystment**: This is a process that occurs in some protozoa (like Amoeba) to survive unfavorable conditions. However, it does not occur in leukocytes. So, this option is incorrect.
- **Pseudopodia**: These are temporary projections of the cell's cytoplasm that help in movement and feeding. Both Amoeba and certain types of leukocytes (like macrophages) use pseudopodia for movement and to engulf pathogens. This option is likely correct.
- **Sporulation**: This is a reproductive process that occurs in some organisms, including certain protozoa, but it does not occur in leukocytes. Thus, this option is incorrect.
- **Contractile Vacuole**: This structure helps in osmoregulation in Amoeba but is not present in leukocytes. Therefore, this option is also incorrect.

3. **Conclusion**:
- The only common trait between Amoeba and leukocytes is the presence of **pseudopodia**. Therefore, the correct answer is **pseudopodia**.

### Final Answer:
The common trait between Amoeba and leukocyte is **pseudopodia**.

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