OCR GCSE Biology A · J247
Specification B1.4d · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Investigating photosynthesisLeave the plant in bright light for a suitable period before removing the leaf and carrying out the starch test.
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GCSE Biology · key term
A chemical test in which iodine solution changes from orange-brown to blue-black when starch is present.
Used by OCR
Specification B1.4d · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Investigating photosynthesisLeave the plant in bright light for a suitable period before removing the leaf and carrying out the starch test.
A control must provide a meaningful comparison. For example, an uncovered part of the same leaf shows that the starch test can give a positive result under the experimental conditions.
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