The macromolecule made by plants that is burned in the mitochondria is glucose.
Plants produce glucose through the process of photosynthesis, where they take in sunlight, carbon dioxide, and water to create this simple sugar. Once produced, glucose serves multiple purposes: it’s an essential source of energy for the plant itself and also for organisms that consume the plants.
Inside the mitochondria, glucose undergoes a series of chemical reactions known as cellular respiration. During this process, glucose is broken down to release energy in the form of adenosine triphosphate (ATP). This ATP is then used by the plant (or any organism that consumes the plant) to fuel various metabolic processes necessary for survival and growth.
In summary, glucose is the key macromolecule burned in the mitochondria, enabling energy production vital for life.