Which of the following is non-flagellate in nature ?

Options

A. Chlorella
B. Ulothrix
C. Spirogyra
D. All of the above

Answer

To determine which of the following options is non-flagellate in nature, we will analyze each option provided:

1. **Chlorella**:
- Chlorella is a genus of single-celled green algae belonging to the division Chlorophyta.
- The cells of Chlorella are spherical in shape and range from about 2 to 10 micrometers in diameter.
- Importantly, Chlorella is non-flagellate, meaning it does not possess flagella for movement.

2. **Eulothrix**:
- Eulothrix is a genus of non-branching filamentous green algae, also belonging to the phylum Chlorophyta.
- These algae are typically found in fresh and marine waters, and their cells are as broad as they are long.
- Eulothrix is also non-flagellate, indicating that it does not have flagella.

3. **Spirogyra**:
- Spirogyra is another genus of filamentous green algae that is known for its spiral arrangement of chloroplasts.
- It is classified under the division Chlorophyta as well.
- Like the previous two, Spirogyra is also non-flagellate.

4. **Conclusion**:
- Since all three options (Chlorella, Eulothrix, and Spirogyra) are non-flagellate, the correct answer to the question is **D. All of the above**.

### Summary of Steps:
- Identify each organism and its characteristics.
- Confirm that each organism is non-flagellate.
- Conclude that all options provided are non-flagellate.