Flame cells (solenocytes) are excretory structures of

Options

A. Annelida
B. Arthropoda
C. Flat worms
D. Crustaceans (prawn)

Answer

**Step-by-Step Solution:**

1. **Understanding Flame Cells (Solenocytes):**
- Flame cells, also known as solenocytes, are specialized excretory structures that function similarly to kidneys. They help in the removal of waste materials from the organism.

2. **Structure of Flame Cells:**
- Each flame cell has a nucleated cell body, which means it contains a nucleus.
- It features a cup-shaped projection that has flagella covering its inner surface.
- The movement of these flagella resembles the flickering of a flame, which is how the name "flame cell" is derived.

3. **Identifying the Organisms with Flame Cells:**
- To determine which organisms possess flame cells, we need to examine the excretory systems of various animal groups:
- **Annelida:** Their excretory system consists of nephridia, not flame cells.
- **Arthropoda:** They have an excretory system made up of Malpighian tubules, which do not include flame cells.
- **Flatworms:** The excretory system of flatworms is indeed composed of flame cells, making this option a potential correct answer.
- **Crustaceans:** Their excretory system consists of antennal glands and maxillary glands, which do not involve flame cells.

4. **Conclusion:**
- After analyzing the excretory systems of the mentioned groups, it is clear that flame cells (solenocytes) are excretory structures found in flatworms.

**Final Answer:**
Flame cells (solenocytes) are excretory structures of flatworms.

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