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 "Flagellated structures are not seen in the life cycle of:", we will analyze each option provided: cyanobacteria, red algae, rhizopus, and "all of these."

### Step-by-Step Solution:

1. **Understanding Flagella**:
- Flagella are whip-like structures that protrude from the cell body and are used for locomotion. They can also serve as sensory organs.

2. **Analyzing Cyanobacteria**:
- Cyanobacteria are prokaryotic organisms and do not have flagella. Instead, some filamentous forms exhibit gliding movement due to slime secretion.

3. **Analyzing Red Algae**:
- Red algae are eukaryotic and are characterized by the absence of flagella. They contain chlorophyll and phycobilins but do not have any flagellated structures.

4. **Analyzing Rhizopus**:
- Rhizopus is a genus of fungi. The spores produced by rhizopus are non-motile and ovoid in shape, meaning they do not have flagella.

5. **Conclusion**:
- Since all three options (cyanobacteria, red algae, and rhizopus) do not have flagellated structures in their life cycles, the correct answer is "all of these."

### Final Answer:
Flagellated structures are not seen in the life cycle of **all of these** (cyanobacteria, red algae, and rhizopus).

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