Plants oxidize sugar in chloroplasts during the day without production of energy. This process is called:

Explanation

The process you're describing is called photorespiration. During photorespiration, plants take up oxygen and release carbon dioxide, which occurs in chloroplasts when the enzyme RuBisCO reacts with oxygen instead of carbon dioxide. This process can lead to the oxidation of sugar, but it does not produce energy in the way that cellular respiration does.