Which process involves the conversion of sugar and oxygen into water and carbon dioxide?

The correct answer reflects the process of cellular respiration, which occurs in the cells of living organisms. During cellular respiration, glucose (a type of sugar) is broken down in the presence of oxygen to produce energy. The byproducts of this reaction are water and carbon dioxide. This process is crucial for providing energy to cells, as it releases stored energy from glucose in a form that cells can utilize.

In contrast, photosynthesis is the process whereby plants convert carbon dioxide and water into glucose and oxygen using sunlight, essentially the reverse of cellular respiration. Transpiration refers to the process by which water is absorbed by plant roots, moves through plants, and is released as vapor through leaves. Evaporation involves the change of liquid water into vapor without any chemical transformation of substances involved. Each of these alternative processes serves a different biological function and is distinct from the energy conversion that takes place during cellular respiration.