Answer:
1. The correct answer would be oxygen.
Oxygen is used as the terminal electron acceptor in cellular respiration. It results in the production of water (byproduct) from oxygen.
2. The correct answer is the third option, that is, Cellular respiration produces more ATP molecules than fermentation.
Fermentation takes place in absence of oxygen which results in the production of lactic acid (or ethanol). In absence of oxygen, glucose does not break down completely due to which less number of ATP is produced.
Fermentation only produces 2 ATP molecules per glucose molecule. In comparison, cellular respiration produces 36-38 ATP per glucose molecule.
3. The correct answer is option third.
The light energy is used to phtolysis of water which releases oxygen and high energy electrons. These electrons are then used to produce NADPH and ATP. These NADPH and ATP are then used in dark phase to fix carbon into glucose.
