mohl's half leaf experiment demonstratas that
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A potted plant is kept in the dark for 48-72 hours for destarching.
A part of a leaf is enclosed in a test tube containing some KOH solution, and the other half is kept out exposed to air.
It is made sure that the leaf does not break off from the plant body while the experiment is going on.
The setup is then kept in sunlight for some time.
Later, the leaf is tested for the presence of starch.
The starch test shows that the exposed part of the leaf tests positive for starch, while the part in the test tube tests negative for starch.
This shows that carbon dioxide is necessary for photosynthesis.
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