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Light No bleach Ne iodine Bleached Iodine Light Bleached No iodine Light Bleached Iodine
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"This activity of the exercise has been set up as a demonstration. Two leaves were selected from a geranium plant. One plant was kept in the dark for a week while the other was kept in natural sunlight. At the end of the week, the photosynthetic pigments were bleached out of both leaves that then turned white. Both leaves were then bathed in iodine. The presence of a black stain in the leaf indicates starch; no stain means no starch is present."

Is the only variable in this activity the natural light? Then what is the function of iodine? What makes the leaves different? Thank you for answering my questions in advance!

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Light
No bleach
Ne iodine Bleached
Iodine Light
Bleached
No iodine Light
Bleached
Iodine

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Subject: Biology, Science

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