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GCSE Combined Science · key term
A test using iodine solution: a blue-black colour indicates starch is present; an orange-brown colour indicates starch is absent.
Used by OCR
Specification B1.4d · Biology Paper 1
Revise: Investigating PhotosynthesisRecord the positions of these areas before removing the chlorophyll during the starch test. Leave the plant in the light, then test the leaf.
In a starch test, hot ethanol removes chlorophyll; iodine detects starch. These substances have different jobs.
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