A : Viroids are not included in five kingdom system.
R : They are non-cellular.

Options

A. If both assertion & reason are true and the reason is the correct explanation of the assertion
B. If both assertion & reason are true but the reason is not the correct explanation of the assertion
C. If assertion is true statement but reason is false
D. If both assertion and reason are false statements

Answer

To analyze the question regarding viroids and their classification, we will break down the assertion and reason step by step.

### Step 1: Understanding the Assertion
The assertion states that "Viroids are not included in the five kingdom system."

- **Explanation**: The five kingdom system, proposed by Whittaker, classifies living organisms into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. Viroids, being non-cellular entities, do not fit into any of these categories, as they lack cellular structure.

### Step 2: Understanding the Reason
The reason states that "They are non-cellular."

- **Explanation**: Viroids are indeed non-cellular. They consist solely of a small circular RNA molecule and do not have a protein coat or cellular machinery. This non-cellular nature is a key characteristic that differentiates them from other living organisms, which are classified into the five kingdoms.

### Step 3: Evaluating the Relationship between Assertion and Reason
Now, we need to evaluate whether the reason correctly explains the assertion.

- **Explanation**: The reason that viroids are non-cellular directly supports the assertion that they are not included in the five kingdom system. Since all organisms in the five kingdom system have some form of cellular organization, the non-cellular nature of viroids justifies their exclusion from this classification.

### Conclusion
Both the assertion and the reason are true, and the reason provides a correct explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation for the assertion.

### Final Answer
**Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.**

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