Question

How would you demonstrate that oxygen is used up during aerobic respiration?

Answer 1

Aerobic respiration uses oxygen is shown with an experiment that requires some seeds, a beaker, glass tube, round bottom glass flask, laboratory stand, KOH pellets and mercury.
Some germinating seeds are placed in the round bottom flask, which is inserted into glass tube and the tube is inverted into a beaker filled with mercury. KOH pellets are placed in glass tube to prevent seeds from absorbing carbon dioxide.
Another set up is arranged without placing KOH pellets. After a day, it is observed that mercury level rises in the tube having KOH pellets, while in other it remains unchanged. This concludes that oxygen is used up by the seeds during aerobic respiration, which lowered the pressure in the bulb and raised mercury level in the tube.