The mode of asexual reproduction in Euglena is

Options

A. (a) Transverse binary fission
B. (b) Longitudinal binary fission
C. (c) Multiple fission
D. (d) Irregular binary fission

Answer

### Step-by-Step Solution:

1. **Understanding Asexual Reproduction**: Asexual reproduction is a process by which a single organism can reproduce without the involvement of gametes, resulting in offspring that are genetically identical to the parent.

2. **Identifying the Organism**: The question specifically asks about Euglena, a unicellular organism that belongs to the kingdom Protista.

3. **Reviewing the Options**: The options given are:
- A) Transverse binary fission
- B) Longitudinal binary fission
- C) Multiple fission
- D) Irregular binary fission

4. **Analyzing Each Option**:
- **Option A: Transverse Binary Fission**: This type of fission occurs in organisms like Paramecium, where the cell divides horizontally. This is not applicable to Euglena.
- **Option B: Longitudinal Binary Fission**: This type of fission occurs in Euglena, where the cell divides vertically. This is the correct mode of asexual reproduction for Euglena.
- **Option C: Multiple Fission**: This process occurs in organisms like Plasmodium, where a single cell undergoes multiple divisions to form many nuclei. This is not applicable to Euglena.
- **Option D: Irregular Binary Fission**: This type of fission occurs in Amoeba, where the cell can divide in any direction. This is also not applicable to Euglena.

5. **Conclusion**: After analyzing all the options, the mode of asexual reproduction in Euglena is confirmed to be **Longitudinal Binary Fission**, which corresponds to option B.

### Final Answer:
The mode of asexual reproduction in Euglena is **Longitudinal Binary Fission (Option B)**.