The kind of sugar that plants use as food is called glucose.

Here's how it works:

* Photosynthesis: Plants use sunlight, water, and carbon dioxide to create glucose through a process called photosynthesis.

* Energy Source: Glucose provides the energy plants need to grow, reproduce, and perform all their vital functions.

While other sugars like fructose and sucrose are also important for plants, glucose is the primary form of sugar they use as fuel.