how can you prove that Co2 is necessary for photosynthesis (or) mouls half experiment
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Answer. Lime water absorbs carbon dioxide and hence there is no carbon dioxide for the leaf and hence photosynthesis does not take place and no starch is prepared. Hence on iodine test, the presence of starch is negative and thus proves that carbon dioxide is required for photosynthesis.
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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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