Assertion : starch can be stained with iodine but cellulose can not
be stained by iodine although both are homopolymer of glucose monomers
Reason : Cellulose does not contain complex helices so can not hold iodine molecules

Options

A. If both assertion & Reason are ture & the Reason is a correct explanation of the Assertion
B. If both Assertion & Reason ar True but Reason is not a correct explantation of the Assertion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are false

Answer

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

### Step 1: Understand the Assertion
The assertion states that "starch can be stained with iodine but cellulose cannot be stained by iodine although both are homopolymers of glucose monomers."

- **Analysis**: Starch and cellulose are indeed both polymers made from glucose. However, they have different structural properties. Starch can form a helical structure, which allows iodine to fit into these helices and produce a blue-black color when stained. In contrast, cellulose has a linear structure and does not form helices, which means it cannot trap iodine.

### Step 2: Understand the Reason
The reason states that "cellulose does not contain complex helices so cannot hold iodine molecules."

- **Analysis**: This statement is correct. The absence of complex helices in cellulose means that iodine molecules cannot be retained, which explains why cellulose does not change color when stained with iodine.

### Step 3: Evaluate the Truth of Assertion and Reason
Both the assertion and the reason are true statements. The reason accurately explains why the assertion is true.

### Step 4: Determine the Relationship Between Assertion and Reason
Since both the assertion and the reason are true, and the reason provides a correct explanation for the assertion, we can conclude that the relationship is valid.

### Conclusion
The correct answer to the question is that both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

### Final Answer
Both assertion and reason are true, and the reason is the correct explanation of the assertion.

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