CBSE Class 10 Science 2018 · Paper 31/1/C · Question 24
Draw a labelled diagram of the experimental set up for the study of liberation of carbon dioxide gas during respiration.
Answer
Draw a flask with germinating seeds and a KOH tube, closed by a cork with a bent delivery tube dipping into water.
The labelled diagram is the figure at step 3. Its parts:
(i) A conical flask with germinating seeds placed on moist cotton.
(ii) A small test tube containing KOH solution, hung inside the flask by a thread from the cork.
(iii) An airtight cork closing the flask.
(iv) A bent glass (delivery) tube passing through the cork, one end opening into the flask and the other end dipping into water in a beaker.
(v) The water rising in the bent tube after some time, because the KOH absorbs the carbon dioxide given out by the respiring seeds.
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