What is the use of KOH solution in the experiment to show that CO2 is given out during respiration?

What is the use of KOH solution in the experiment to show that CO2 is given out during respiration?
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Answer. During the experiment, germinating seeds give out CO2 which is absorbed by KOH. Thus a partial vacuum is created in the flask due to which water level rises in the tube.
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A student is to conduct an experiment to show CO2 is released during respiration. List two precautions that he/she must take for obtaining correct observation. -Science

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Last Answer : Two precautions to be taken are: (i) Germinating seeds (living) should be used. (ii) The experiment set up must be air-tight.

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Last Answer : Answer. Two precautions to be taken are: (i) Germinating seeds (living) should be used. (ii) The experiment set up must be air-tight.

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