Answer:
Due to breakdown of glucose molecules.
Step-by-step explanation:
Increased respiration in the plants in warmer climates reduce the amount of sugar in the fruit because in the process of respiration, sugar molecules such as glucose is broken down by mitochondria of the cell in the presence of oxygen for the production energy in the form of ATP. Due to this breakdown of glucose molecules, fruits of warmer regions are less sweeter than fruits of cooler regions.