Assumption: Agar-agar is a carbohydrate obtained from some sea weeds. Reason: Agar agar is a polysaccharides formed of many galactose monomers.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

### Step-by-Step Solution:

1. **Understanding the Assumption**: The assumption states that "Agar-agar is a carbohydrate obtained from some seaweeds." We need to verify if this statement is true.
- **Explanation**: Agar-agar is indeed derived from certain types of red algae, which are commonly referred to as seaweeds. This confirms that the assumption is correct.

2. **Understanding the Reason**: The reason provided states that "Agar-agar is a polysaccharide formed of many galactose monomers." We should evaluate the accuracy of this statement.
- **Explanation**: Agar-agar is classified as a polysaccharide, which means it is a carbohydrate made up of long chains of monosaccharides. Specifically, agar-agar is composed of units of D-galactose and L-galactose. This confirms that the reason is also correct.

3. **Analyzing the Relationship**: Now, we need to determine if the reason is a correct explanation of the assumption.
- **Explanation**: Since agar-agar is a carbohydrate (as stated in the assumption) and is made up of galactose monomers (as stated in the reason), the reason provides a scientific basis for understanding why the assumption is true.

4. **Conclusion**: Both the assumption and the reason are correct, and the reason correctly explains the assumption.
- **Final Statement**: Therefore, the answer is that both the assumption (A) and the reason (R) are correct, and R is the correct explanation of A.