Which carbohydrate form is the plant's way of storing glucose?

The correct answer is starch, which is the primary form of carbohydrate storage in plants. Starch is a polysaccharide made up of numerous glucose units linked together, and it serves as an energy reserve for plants. When a plant synthesizes glucose through photosynthesis, it can store excess glucose in the form of starch in various parts of the plant, such as tubers, seeds, and roots. This stored starch can later be converted back to glucose when the plant needs energy for growth, maintenance, or reproduction.

This is distinct from other options provided. Cellulose is also a polysaccharide made from glucose but serves as a structural component in plant cell walls, not a storage form. Glycogen, while it is another storage form of glucose, is primarily found in animals and fungi, not plants. Chitin is a structural polysaccharide found in the exoskeletons of arthropods and in fungal cell walls, and it does not serve as a storage form for glucose in plants.

Understanding the role of starch in plants highlights its importance in energy storage and utilization, which is not reflected in the functions of the other carbohydrate forms mentioned.