In the experiment of ro prove that oxygen is used up in respiration what us the observation
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Answer:
Put some germinating seeds in a conical flask. With the help of a thread suspend a small tube containing KOH in the flask. Through the hole of the cork, pass a glass tube bent twice at right angles. One end of the tube is in the flask while the other end is in the beaker filled with water.Make the apparatus airtight. Note the level of water in the tube. Keep the apparatus for some time and note the position of water.
It is observed that water rises in the tube. The rise in the level of water is due to a partial vacuum created in the flask because the gas produced during respiration is absorbed by KOH.
This shows that germinating seeds produce CO2 during aerobic respiration as KOH can absorb CO2.
This is aerobic respiration as KOH can absorb CO2 produced by seeds using air available.