Choanocyte are found in :

Options

A. Protozoa
B. Porifera
C. Coelenterata
D. Ctenophora

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Choanocyte":**
- Choanocytes, also known as collar cells, are specialized cells that play a crucial role in the feeding and water circulation system of certain animals.

2. **Identifying the Options:**
- The question provides four options:
A. Protozoa
B. Porifera
C. Coelenterata
D. Tenophora

3. **Analyzing Each Option:**
- **A. Protozoa:** These are single-celled organisms and do not have specialized cells like choanocytes.
- **B. Porifera:** This phylum includes sponges, which are known to have choanocytes that help in water filtration and nutrient absorption.
- **C. Coelenterata:** This group includes jellyfish and corals, which do not possess choanocytes.
- **D. Tenophora:** This phylum includes comb jellies, which also do not have choanocytes.

4. **Conclusion:**
- Based on the analysis, choanocytes are specifically found in the phylum Porifera, which includes sponges.

5. **Final Answer:**
- Choanocytes are found in **B. Porifera**.

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