In what form do plants primarily store energy?

Plants primarily store energy in the form of starch. Starch is a polysaccharide composed of numerous glucose units linked together. It serves as an efficient energy reserve, allowing plants to store surplus carbohydrates produced during photosynthesis. When plants require energy, they can break down starch into glucose molecules, which are then utilized in cellular respiration to produce ATP, the energy currency of cells.

While cellulose is a structural component of the plant cell wall, and glucose and sucrose play important roles in metabolism and energy transport, it's starch that functions specifically as the main storage form of energy in plants.