Assertion : They form mutualistic, commensalistic, or parasitic relationships.
Reason : Heterotrophs may not be free living or symbiotic.

Options

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

Explanation

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

### Step 1: Understand the Assertion
The assertion states: "They form mutualistic, commensalistic, or parasitic relationships."
- **Mutualistic relationships** are those where both organisms benefit from the interaction.
- **Commensalistic relationships** involve one organism benefiting while the other is neither helped nor harmed.
- **Parasitic relationships** are when one organism benefits at the expense of the other, causing harm.

### Step 2: Analyze the Reason
The reason states: "Heterotrophs may not be free living or symbiotic."
- Heterotrophs are organisms that cannot produce their own food and rely on other organisms for nutrition.
- The statement implies that heterotrophs are either not free-living (dependent on other organisms) or not forming symbiotic relationships.

### Step 3: Evaluate the Truth of Assertion and Reason
- The assertion is **true** because heterotrophs can indeed form mutualistic, commensalistic, or parasitic relationships.
- The reason is **false** because heterotrophs can be both free-living (like some fungi and bacteria) and symbiotic (like mycorrhizal fungi).

### Step 4: Determine the Relationship Between Assertion and Reason
Since the assertion is true and the reason is false, we conclude that the correct option is:
- **Assertion is true, Reason is false.**

### Final Answer
The correct answer is that the assertion is true, and the reason is false.