Flagellated structures are not seen in the life cycle of :

Options

A. Cyanobacteria
B. Red algae
C. Rhizopus
D. All of these

Answer

To solve the question about which organism does not exhibit flagellated structures in its life cycle, we can analyze each option provided:

1. **Understanding Flagellated Structures**:
- Flagellated structures refer to the presence of flagella, which are whip-like appendages that enable movement in certain organisms. They are typically made of a protein called flagellin.

2. **Analyzing Each Option**:
- **Option A: Cyanobacteria**:
- Cyanobacteria are known to form motile filaments called hormogonia, but they do not have flagella in their life cycle. Therefore, this option does not contain flagellated structures.
- **Option B: Red Algae**:
- Red algae are a group of algae that do not possess flagella at any stage of their life cycle. Thus, this option also does not have flagellated structures.
- **Option C: Rhizopus**:
- Rhizopus is a genus of fungi that does not produce flagella on its spores. Hence, this option also lacks flagellated structures.
- **Option D: All of these**:
- Since all the previous options (Cyanobacteria, Red Algae, and Rhizopus) do not have flagellated structures, this option is correct as it encompasses all the previous options.

3. **Conclusion**:
- The correct answer is **Option D: All of these**, as none of the organisms listed exhibit flagellated structures in their life cycle.