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