Assertion: Lichens are the plants growing perched on other plants.
Reason: Lichens unitedly make association with algae and fungi and show mutualism.

Options

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

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Lichens are the plants growing perched on other plants."
- This statement is incorrect. Lichens are not classified as plants; they are a symbiotic association between fungi and algae (or cyanobacteria). They can grow on various surfaces, including trees, rocks, and soil, but they do not grow "perched" on other plants in the way epiphytes do.

**Hint**: Remember that lichens are not plants; they are a combination of fungi and algae.

2. **Understanding the Reason**:
- The reason states that "Lichens unitedly make an association with algae and fungi and show mutualism."
- This statement is correct. Lichens are indeed a mutualistic association where the fungal partner (mycobiont) provides structure and protection, while the algal partner (phycobiont) performs photosynthesis to produce food.

**Hint**: Focus on the definition of lichens and their mutualistic relationship.

3. **Evaluating the Relationship Between Assertion and Reason**:
- Since the assertion is false and the reason is true, we need to determine the overall correctness of the statements.
- The assertion being false means that the reason cannot be used to justify the assertion.

**Hint**: Assess whether the truth of the reason supports the assertion.

4. **Conclusion**:
- Both the assertion and the reason cannot be true at the same time. Therefore, the correct answer is that both the assertion and the reason are false.

**Final Answer**: The correct option is that both the assertion and reason are false.

### Summary of the Solution:
- The assertion about lichens being plants is false.
- The reason about the mutualistic relationship in lichens is true.
- Since the assertion is false, the overall statement is that both are false.