Question

Design an activity to show that CO2 is produced during breathing

Answer 1

Ans

Put some germinating seeds in a conical flask.The conical flask is fitted to a delivery tube bent twice at right angles by means of cork.Suspend a small test tube containing 20% potassium hydroxide.Dip the free end of the bent tube in a beaker of coloured water.Leave it for a day. Note the changes.The germinating seeds respires aerobically by utilizing the oxygen in the flask.Carbon dioxide released during the aerobic respiration is absorbed by potassium hydroxide and creates a vacuum and causes rise of water in the bent tube.If we put a burning candle in the setup, the candle extinguishes which proves oxygen is utilized by germinating seed for respiration.

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