Nephridia of Earthworm are analogous to

Options

A. Nematoblasts of Hydra
B. Flame cells of Planaria
C. Gills of Prawn
D. Trachea of insects

Explanation

To determine what the nephridia of earthworms are analogous to, we need to understand the function of nephridia and compare it with the functions of the options provided.

### Step-by-Step Solution:

1. **Understand Nephridia**:
- Nephridia are excretory organs found in earthworms (phylum Annelida). They are responsible for the removal of nitrogenous waste from the body.

2. **Analyze the Options**:
- **Option 1: Nematoblast of Hydra**:
- Nematoblasts are specialized cells in hydra that help in prey capture. This function is related to feeding, not excretion.
- **Option 2: Flame Cells of Planaria**:
- Flame cells are excretory structures in planaria (phylum Platyhelminthes) that also function to remove nitrogenous waste from the body. This is similar to the function of nephridia in earthworms.
- **Option 3: Gills of Prawn**:
- Gills are respiratory organs that facilitate gas exchange (breathing) in aquatic animals. This function is different from excretion.
- **Option 4: Trachea of Insects**:
- Trachea are respiratory structures in insects that also facilitate gas exchange. This is again unrelated to excretion.

3. **Compare Functions**:
- Since nephridia and flame cells both serve the purpose of excretion, they are functionally analogous. The other options (nematoblasts, gills, and trachea) serve different functions related to feeding or respiration.

4. **Conclusion**:
- The nephridia of earthworms are analogous to the flame cells of planaria.

### Final Answer:
The nephridia of earthworms are analogous to the flame cells of planaria.

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