CBSE Class 10 Science 2019 · Paper 31/1/1 · Question 25
In the experimental set up to show that “ is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.
Answer
Potassium hydroxide solution absorbs the carbon dioxide, creating a partial vacuum, so water rises in the delivery tube.
Substance: potassium hydroxide (KOH) solution.
Function: it absorbs the carbon dioxide given out by the germinating seeds during respiration.
Consequence: as the is absorbed, a partial vacuum is created in the conical flask (the pressure inside falls), so water from the beaker rises in the bent delivery tube. This shows that is given out during respiration.
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