The Carbohydrate molecules are the organic molecules composed of hydrogen and oxygen in the 2:1 ratio. The carbohydrate molecules are considered one of the four important biomolecules as they perform various functions in the organisms.
The simple carbohydrate molecule called glucose is the most favoured substrate which is used by the organism to provide energy. The carbohydrate molecule undergoes the process of cellular respiration to provide "chemical energy" in the form of ATP molecules. These ATP molecules are used by the cell in performing various functions.
Thus, Chemical energy in the form of ATP molecules is the correct answer.
