Assertion: Decomposition is one of the most vital functional attribute of ecosystem.
Reason: It helps in breakdown of organic complex matter and loosening of soil as well.

Options

A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.
B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason if False.
D. If both Assertion `&` Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Decomposition is one of the most vital functional attributes of the ecosystem."
- Decomposition is the process where complex organic matter is broken down into simpler inorganic substances by decomposers such as bacteria and fungi. This process is essential for recycling nutrients in the ecosystem, making it a vital function.

2. **Understanding the Reason:**
- The reason provided is that "It helps in the breakdown of organic complex matter and loosening of soil as well."
- Decomposition indeed involves breaking down organic matter into simpler forms, which releases nutrients back into the soil. Additionally, the process of decomposition contributes to soil structure and aeration, which can be described as "loosening of soil."

3. **Evaluating the Assertion and Reason:**
- Both the assertion and reason are correct. Decomposition is crucial for nutrient cycling and maintaining ecosystem health, and it does help in breaking down organic matter and improving soil structure.

4. **Determining the Relationship:**
- The reason explains the assertion accurately. The breakdown of organic matter and the improvement of soil structure are both essential components of why decomposition is vital to the ecosystem.

5. **Conclusion:**
- Since both the assertion and reason are true, and the reason correctly explains the assertion, the answer is that both are correct and the reason is a correct explanation of the assertion.

**Final Answer:**
Both assertion and reason are true, and the reason is the correct explanation of the assertion.

---