Testing A Leaf For Starch

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  • @snicol1000 if the starch is present in the leaf it would turn into blue-black while if starch is not present the colour will be yellow-brown
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  • @guest9eb193b In addition about the decolourising of the chlorophyll from the leaf, by removing the green pigments in the chlorophyll we would be able to observed the effects of the presence of the starch.
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  • @guest9eb193b If I'm not mistaken, the reason why we are decolourising the leaf is that to remove the green pigments of the cholorophyll. It is also to destarched the leaf and to test whether what's gonna happen on the leaf if iodine is put into it by the absence of the starch.
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  • testing of starch and protien in plants
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  • what colour does the leaf go if there is or isnt any starch
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Testing A Leaf For Starch

  1. 1. Testing leaves for starch After photosynthesis, green plants store glucose as starch in their leaves.
  2. 2. What you will test. <ul><li>You will test 2 leaves: </li></ul><ul><li>One from a plant left in the light . </li></ul><ul><li>One from a plant kept in the dark . </li></ul>
  3. 3. Put the 2 leaves in boiling water to kill them
  4. 4. Place the leaves in a boiling tube with ethanol
  5. 5. wait until all the green colour disappears from the leaves
  6. 6. Remove the leaves
  7. 7. Wash the leaves
  8. 8. Spread the leaves out on a white tile
  9. 9. carefully add iodine to the leaves
  10. 10. Wait a few minutes and note the colour of the leaves

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