Assertion : Lichen forms thin green film on surface of water.
Reason: Lichen is symbiotic association between algae and fungi.

Options

A. Both Assertion and Reason are true and Reason is correct explanation of the assertion.
B. Both Assertion and Reason are true but Reason is not the correct explanation of the assertion.
C. Assertion is true but Reason is false.
D. Assertion is false but Reason is true.

Answer

To solve the question regarding the assertion and reason about lichens, we can break it down into the following steps:

### Step 1: Understand the Assertion
The assertion states that "Lichen forms a thin green film on the surface of water." We need to analyze whether this statement is true or false.

**Hint:** Consider what lichens are and where they are commonly found.

### Step 2: Understand the Reason
The reason states that "Lichen is a symbiotic association between algae and fungi." We need to evaluate if this statement is true or false as well.

**Hint:** Recall the definition of lichen and the relationship between its components.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided explains the assertion. While both statements may be true, we need to see if the reason clarifies why lichens form a thin green film on water.

**Hint:** Think about the role of algae and fungi in the formation of lichens and whether that relates to their presence on water surfaces.

### Step 4: Conclusion
Based on the evaluations:
- The assertion is true because lichens can indeed form a thin green film on water surfaces.
- The reason is also true as lichens are a symbiotic association between algae and fungi.
- However, the reason does not explain why lichens form a film on water.

Thus, the correct conclusion is that both statements are correct, but the reason does not provide a correct explanation for the assertion.

**Final Answer:** Both the assertion and reason are correct, but the reason does not explain the assertion.