Question: Identify the polysaccharide among the following: (A) Fructose, (B) Maltose, (C) Glucose, (D) Cellulose.

Step 1 (Definition & Classification): [0.5 Mark]

Carbohydrates are classified based on their hydrolysis products. A polysaccharide is a carbohydrate that yields a large number of monosaccharide units upon hydrolysis. The general formula for polysaccharides is $(C_6H_{10}O_5)_n$, where $n$ is a large integer.

Step 2 (Analysis of Options): [0.25 Mark]

• (A) Fructose: A monosaccharide (ketohexose).
• (B) Maltose: A disaccharide (yields 2 units of glucose upon hydrolysis).
• (C) Glucose: A monosaccharide (aldohexose).
• (D) Cellulose: A polymer of $\beta$-D-glucose units linked by $\beta$-glycosidic linkages, classified as a polysaccharide.

Step 3 (Final Concluded Answer): [0.25 Mark]

Based on the classification of carbohydrates, Cellulose is the correct polysaccharide.

Correct Option: (D) Cellulose

💡 EL10 Concept Insight: Think of monosaccharides as single Lego bricks and disaccharides as two bricks snapped together; a polysaccharide is like a massive, long chain of thousands of those bricks connected in a row, which is exactly what cellulose is in plant cell walls.