The member of following phylum represent cellular level of organization

Options

A. Cnidaria
B. Porifera
C. Protozoa
D. Both (a) and (b).

Answer

To determine which phylum represents a cellular level of organization, we can analyze the options provided.

### Step-by-Step Solution:

1. **Identify the Phyla**: The question asks us to identify which phylum represents a cellular level of organization. The options provided include:
- A) Cnidaria
- B) Porifera
- C) Protozoa
- D) Both A and B

2. **Analyze Cnidaria**:
- Cnidaria, which includes organisms like jellyfish and corals, exhibits a tissue level of organization. This means that cells are organized into tissues, which perform specific functions. Therefore, Cnidaria does not represent a cellular level of organization.

3. **Analyze Porifera**:
- Porifera, commonly known as sponges, is characterized by a cellular level of organization. In this phylum, the cells are not organized into true tissues; instead, they function independently. Thus, Porifera is a correct example of a phylum with a cellular level of organization.

4. **Analyze Protozoa**:
- Protozoa are unicellular organisms, meaning they consist of a single cell that performs all necessary life functions. This also indicates a cellular level of organization. Therefore, Protozoa is another correct example.

5. **Analyze Option D (Both A and B)**:
- Since Cnidaria does not represent a cellular level of organization, the option stating "Both A and B" is incorrect.

6. **Conclusion**:
- Based on the analysis, the correct answers are Porifera and Protozoa. However, since the question specifically asks for a phylum that represents a cellular level of organization, the best answer is **B) Porifera**.

### Final Answer:
The member of the following phylum that represents a cellular level of organization is **Porifera**.