Articles > Oxygen definition – quiz Oxygen definition – quiz Quiz Choose the best answer. 1. Which of the following is true about oxygen? Oxygen is a compound. Oxygen has an atomic number of 10. Singlet oxygen is a dioxygen. 2. Molecular oxygen Atomic oxygen Triplet oxygen Singlet oxygen 3. Oxygen that is chemically bound to two molecules of hydrogen Ozone Water Organic compound 4. The role of oxygen in aerobic respiration Immune function Final electron acceptor Photosynthesis 5. Oxygen is a byproduct Cell respiration Fermentation Photosynthesis Send Your Results (Optional) Your Name To Email Time is Up!