Functionwise, just as there are nephridia in an earthworm, so are

Options

A. parotid glands in toad
B. statocysts in prawn
C. flame cells in liver fluke
D. myotomes in fish

Explanation

**Step-by-Step Solution:**

1. **Understand the Function of Nephridia in Earthworms:**
- Nephridia are excretory organs found in earthworms. Their primary function is to remove waste products from the body and help in osmoregulation.

2. **Identify the Options Given:**
- The question provides several options that might serve a similar function to nephridia in other organisms:
- Parotid glands in toads
- Statocysts in prawns
- Flame cells in liver flukes
- Myotomes in fish

3. **Analyze Each Option:**
- **Parotid Glands in Toads:**
- These glands are not excretory organs; they secrete toxins for defense against predators.
- **Statocysts in Prawns:**
- Statocysts are balancing organs and do not serve an excretory function.
- **Flame Cells in Liver Flukes:**
- Flame cells are indeed excretory structures that help in osmoregulation and waste removal, functioning similarly to nephridia in earthworms.
- **Myotomes in Fish:**
- Myotomes are muscle segments that aid in movement, not in excretion.

4. **Conclusion:**
- The correct answer is **flame cells in liver flukes**, as they serve a similar excretory function as nephridia in earthworms.

**Final Answer:**
Flame cells in liver flukes.

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