In earthworm, the nephridia collect nitrogenous wastes from -

Options

A. Skin
B. Blood
C. Coelomic fluid
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Nephridia in Earthworms**: Nephridia are the excretory organs in earthworms that help in the removal of nitrogenous wastes from the body. They function similarly to kidneys in higher organisms.

2. **Identifying the Source of Nitrogenous Wastes**: In earthworms, the nitrogenous wastes primarily come from the metabolic processes occurring in the body. These wastes are dissolved in the body fluids.

3. **Role of Coelomic Fluid**: The coelomic fluid, which fills the body cavity of the earthworm, contains the nitrogenous wastes that need to be excreted.

4. **Mechanism of Waste Collection**: The septal nephridia collect these wastes from the coelomic fluid. The nephrostome (the opening of the nephridia) plays a crucial role in this process by drawing in the coelomic fluid containing the wastes.

5. **Conclusion**: Therefore, the correct answer to the question is that in earthworms, the nephridia collect nitrogenous wastes from the **coelomic fluid**.

**Final Answer**: C) Coelomic fluid

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