Assertion : Viruses are not included in any system of classification.
Reason : Viruses are non-living but devlop living characters like multiplication etc. when they come in contact with suitable host.

Options

A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not a correct explantion of the Assertion.
C. If Assertion is ture but the Reason is false.
D. If both Assertion and Reason are false.

Answer

To analyze the assertion and reason provided in the question, we will break down the statements step by step.

### Step 1: Understand the Assertion
The assertion states that "Viruses are not included in any system of classification."
- **Explanation**: Viruses are unique entities that do not fit neatly into the traditional biological classification systems (like the five kingdoms). They are often considered to be at the boundary between living and non-living things.

### Step 2: Understand the Reason
The reason states that "Viruses are non-living but develop living characters like multiplication etc. when they come in contact with a suitable host."
- **Explanation**: Viruses are classified as non-living because they cannot carry out metabolic processes on their own. However, when they infect a host cell, they can hijack the host's cellular machinery to replicate and produce new virus particles, demonstrating characteristics of living organisms.

### Step 3: Analyze the Relationship Between Assertion and Reason
- Both the assertion and reason are true statements. The assertion correctly identifies that viruses are not classified within traditional biological systems, and the reason accurately describes the nature of viruses as non-living entities that exhibit living characteristics under certain conditions.

### Step 4: Conclusion
Given that both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we conclude that:
- **Final Answer**: Both assertion and reason are true, and the reason is a correct explanation of the assertion.