Moll's experiment shows that:

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(C) Moll's half-leaf experiment is a classic demonstration used to prove that $CO_2$ is essential for the process of photosynthesis. In this experimen

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$CO_2$ is required for photosynthesis

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(C) Moll's half-leaf experiment is a classic demonstration used to prove that $CO_2$ is essential for the process of photosynthesis. In this experiment,half of a leaf is inserted into a bottle containing potassium hydroxide $(KOH)$ solution,which absorbs $CO_2$. The other half remains exposed to the atmosphere. After keeping the plant in sunlight,the starch test (using iodine solution) shows that the part of the leaf exposed to air turns blue-black (indicating starch presence),while the part inside the bottle does not,proving that $CO_2$ is necessary for photosynthesis.

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