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Starch content of leaves

Starch content of leaves

C026/6787

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Experiment to show the starch content of a leaf. A fresh leaf (at left) is boiled in water for 30 seconds then in boiling ethanol for a few minutes (left of centre). This removes most of the colour (right of centre) and the leaf is washed in cold water. Iodine solution is added from a pipette. Those parts of the leaf containing starch turn blue-black (starch iodide, right).

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