Glucose is formed through photosynthesis, which is a process performed by plants with energy from the sun. The synthesis process in glucose is performed in chloroplasts in the plant leaves.
Chloroplasts are able to capture energy from the sunlight and create glucose molecules from carbon dioxide and water. The carbon dioxide is found in the air and the water is found in the soil. This is how glucose is formed in plants.
Glucose is a carbohydrate and is considered the most important simple sugar, also called a monosaccharide, in a human's metabolism. It is one of the primary ways for plants and animals to get energy because it is a necessary building block for energy.
It is found in the bloodstream of humans. Humans cannot make glucose on their own and must ingest glucose by eating plants or animals who ate plants. When glucose is found in the human bloodstream, it is called blood sugar. A human should have approximately 0.1-percent concentration of glucose in the blood; however, those individuals who suffer from diabetes will have a much higher concentration of glucose in the blood.
Glucose is also occasionally called dextrose. Energy from glucose is obtained in humans through the oxidation reaction.