Excretory material are formed in

Options

A. Kidney
B. Rectum
C. Liver
D. Every cell of the body

Answer

**Step-by-Step Solution:**

1. **Understanding Excretory Materials**: Excretory materials are substances that are eliminated from the body as waste. These include nitrogenous wastes, carbon dioxide, and other metabolic byproducts.

2. **Identifying the Source of Excretory Materials**: Excretory materials are produced as a result of cellular metabolism. Every cell in the body undergoes metabolic processes that generate waste products.

3. **Role of Different Organs**:
- **Kidney**: The kidneys filter blood and remove waste products, but they do not produce excretory materials themselves; they process the waste produced by cells.
- **Rectum**: The rectum stores feces, which are solid waste products, but it does not produce them.
- **Liver**: The liver does produce some waste products (like urea) and detoxifies substances, but it is not the primary site of excretory material formation.

4. **Conclusion**: Since excretory materials are formed by metabolic processes occurring in every cell of the body, the correct answer is that excretory materials are formed in **every cell of the body**.

5. **Final Answer**: The correct option is **every cell of the body**.

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