Plants store excess glucose primarily in the form of starch, a complex carbohydrate. During photosynthesis, plants produce glucose, which they use for energy and growth. However, when there's more glucose than the plant needs at the moment, it converts the excess into starch for long-term storage.

This starch is usually stored in parts of the plant like:

• Roots (e.g., potatoes, carrots)
• Stem (e.g., sugarcane)
• Leaves (e.g., in some plants like spinach)

When the plant needs energy later, it can break down the starch back into glucose through a process called hydrolysis. This allows the plant to access the stored energy when it's not actively photosynthesizing, such as at night or during periods of low light.

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