Solenocytes/ flame cells are excretory structures of

Options

A. Echinodermates
B. Platyhelminthes
C. Annelids
D. Molluscs

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the specific type of excretory structures known as solenocytes or flame cells and which animal phylum they belong to.

2. **Analyzing the Options**: The options provided are four different phyla: Echinodermata, Platyhelminthes, Annelida, and Mollusca. We need to determine which of these phyla contains solenocytes or flame cells.

3. **Reviewing Echinodermata**: Echinoderms do not have specialized excretory organs. They excrete waste through their general body surface via simple diffusion. Therefore, they do not have flame cells.

4. **Reviewing Platyhelminthes**: Platyhelminthes, which are flatworms, do possess excretory structures called flame cells (or solenocytes). These are part of a system known as protonephridia, which is responsible for the removal of waste.

5. **Reviewing Annelida**: Annelids have a different type of excretory organ known as nephridia. They do not have flame cells, so this option is not correct.

6. **Reviewing Mollusca**: Mollusks have excretory organs known as the organ of Bojanus. They do not possess flame cells, making this option incorrect as well.

7. **Conclusion**: Based on the analysis, the correct answer is Platyhelminthes, as they are the only phylum listed that has solenocytes or flame cells as their excretory structures.

**Final Answer**: Solenocytes/flame cells are excretory structures of Platyhelminthes.

---