Question

How can life use energy without creating it first

Answer 1

Solution: Cells like human cannot generate energy by their own. They need to hire external source. Unlike humans, the plants utilizes sunlight for the generation of high energy molecules. Plants through a process called as photosynthesis most precisely light reaction in photosynthesis make use of light energy to split water molecules. The electrons and protons released during this splitting is used to rotate the pump called as ATP synthase. Plants also convert NADP into NADPH during this reaction. This NADPH and ATP are utilized during carbon reaction for generating carbohydrates. Human cells depend on these carbohydrates from plants. Human cells convert starch and sucrose obtained from plants into glucose. These glucose molecules are then oxidised for the generation of energy.