The group of protozoans considered as most advanced & showing transvers binary flssion are

Options

A. Ciliates
B. Mastigophora
C. Mastigophora
D. Sporozoa

Answer

To answer the question regarding the group of protozoans considered as the most advanced and showing transverse binary fission, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protozoans**: Protozoans are single-celled organisms that are classified into various groups based on their characteristics.

2. **Identifying Transverse Binary Fission**: Transverse binary fission is a type of asexual reproduction where the organism divides into two parts, and it involves the presence of two nuclei—one larger and one smaller. The larger nucleus serves as a food reserve, while the smaller nucleus carries genetic material for reproduction.

3. **Identifying the Group**: Among the various groups of protozoans, we need to identify which one exhibits transverse binary fission. The groups include:
- Ciliates
- Mastigophora
- Sporozoa

4. **Analyzing Ciliates**: Ciliates, such as Paramecium, are known for their complex structure and are characterized by the presence of cilia. They reproduce by transverse binary fission, which involves the division of the organism into two daughter cells, each containing two nuclei.

5. **Analyzing Other Groups**:
- **Mastigophora**: This group does not exhibit transverse binary fission; they reproduce through syngamy.
- **Sporozoa**: This group primarily reproduces through conjugation and does not show transverse binary fission.

6. **Conclusion**: Based on the analysis, the group of protozoans that is considered the most advanced and shows transverse binary fission is **Ciliates**, specifically exemplified by **Paramecium**.

### Final Answer:
The group of protozoans considered as most advanced and showing transverse binary fission is **Ciliates**.