Answer: (A) Glucose
Explanation: Glucose is a hexose monosaccharide because it has six carbon atoms in its structure. Ribose, Galactose, and Deoxyribose are also sugars, but they differ in the number of carbon atoms or their structural characteristics.

Answer: (B) C6H12O6
Explanation: The chemical formula for glucose is C6H12O6. This formula indicates that glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms, which is the characteristic composition of this simple sugar.

Answer: (B) Fructose
Explanation: Fructose is a ketose sugar because it contains a ketone group, while glucose, galactose, and mannose are aldose sugars, which have an aldehyde group.

Answer: (D) Isomers
Explanation: Glucose and fructose are both simple sugars with the same molecular formula (C₆H₁₂O₆) but different structural arrangements. This makes them isomers of each other.

Answer: (C) Raffinose
Explanation: Raffinose is an oligosaccharide that is indeed commonly found in human milk, whereas sucrose, lactose, and cellulose are either disaccharides or polysaccharides with different roles or sources.

Answer: (C) Cellular recognition
Explanation: Oligosaccharides are important for cellular recognition because they are involved in the formation of glycoproteins and glycolipids on the cell surface, which help cells identify and interact with each other.

Answer: (C) Lactose
Explanation:  Lactose is a disaccharide made up of glucose and galactose. Maltose consists of two glucose units, sucrose is made of glucose and fructose, and raffinose contains glucose, fructose, and galactose.

Answer: (C) Starch
Explanation: Starch is the polysaccharide primarily used by plants to store energy. Cellulose provides structural support, glycogen is used for energy storage in animals, and chitin is found in the exoskeletons of arthropods.

Answer: (B) Cellulose
Explanation: Cellulose is a polysaccharide that forms the primary structural component of plant cell walls, giving them rigidity and strength. Starch and glycogen serve as energy storage, while dextran is not a major structural component in plants.

Answer: (C) Animals
Explanation: Glycogen is the primary storage form of carbohydrates in animals. It is stored mainly in the liver and muscles, providing a quick energy source when needed. Plants store carbohydrates as starch, not glycogen.