A: Nutritional mutant strain of pink mould is auxotroph.
R: It is not able to prepare its own metabolites form the raw materials obtained form outside .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark
B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark
C. If Assertion is ture statement but Reason is false, then mark.
D. If both Assertion and Reason are false statements, then mark.

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Understand the Assertion
- **Assertion (A)**: "Nutritional mutant strain of pink mould is auxotroph."
- **Explanation**: Auxotrophs are organisms that have lost the ability to synthesize certain metabolites due to mutations. This means they cannot produce essential nutrients and must obtain them from their environment.

### Step 2: Validate the Assertion
- Since auxotrophs are defined as mutants that cannot synthesize necessary compounds for growth, the assertion is correct. The pink mould being described as a nutritional mutant strain fits this definition.

### Step 3: Understand the Reason
- **Reason (R)**: "It is not able to prepare its own metabolites from the raw materials obtained from outside."
- **Explanation**: This statement explains the condition of auxotrophs. They rely on external sources for metabolites because they cannot produce them internally.

### Step 4: Validate the Reason
- The reason provided accurately describes the situation of auxotrophs. They indeed cannot prepare their own metabolites and must rely on external sources, confirming that this statement is also correct.

### Step 5: Determine the Relationship Between A and R
- Since both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion, we conclude that the relationship between A and R is that R explains A.

### Conclusion
- Both the assertion and the reason are correct, and the reason is a correct explanation of the assertion.

### Final Answer
- The correct option is that both A and R are true, and R is the correct explanation of A.

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