how do we know that leaf has prepared starch
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When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch. The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch
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Testing a leaf for starch is the simplest photosynthesis lab. A positive test for starch in a leaf provides evidence that photosynthesis has occurred. The test for starch is a leaf is an is an extension of the Iodine Test for
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