An experiment to show carbon dioxide is necessary for photosynthesis

(i) A potted plant is kept in the dark for 24 hours to remove starch from its leaves.

(ii) one its leaves is enclosed in a conical flask containing   potassium hydroxide and another  in a flask containing water as shown in the figure below

• The plant is then placed in sunlight for 3 hour.
• Each of the two leaves is tested for the presence of starch.
• The leaf in a flask that contained potassium hydroxide solution does not contain  starch because potassium absorbed carbon dioxide which was necessary for photosynthesis.

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