Experiment to show that CO₂ is released during respiration.

• Take a conical flask and place some germinating seeds in it. Hang a test tube filled with potassium hydroxide solution (this solution absorbs carbon dioxide) inside the conical flask.

• Now take a rubber cork with a hole it. Insert the short end of a glass tube inside the conical flask.

• Take coloured water in another beaker. Now take the longer end of the glass rod and dip it in the coloured water. Note the initial water level through the glass rod.

• Leave the setup undisturbed for an hour. Notice the final water level in the glass rod.

Observations- You will observe that the water level in the glass rod has increased.