Question

explain with the help of an experiment that CO2 is necessary for photosynthesis​

Answer 1

Explanation:

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• Keep a potted plant in dark for three days so that leaves are destarched.
• Insert a part of a destarched plant into a conical flask containing potassium hydroxide.
• Potassium hydroxide absorbs the carbon dioxide gas from the air present in flask.
• leave the plant in sunlight.
• After few hours perform a starch test to this and another leaf of the same plant.
• Observations :-
• Leaf exposed to atmosphere are bluish black.
• Leaf exposed to KOH does not change to blue black colour.
• Starch is present in green part of leaf.
• Thus, CO2 is essential for photosynthesis.

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