A variegated leaf of a plant has green areas (containing chlorophyll) and white areas (containing no chlorophyll). A strip of black paper was placed across the middle of the leaf to block light, and the plant was then kept in the light for 48 hours.
After 48 hours, four discs, labeled A, B, C, and D, were cut from different regions of the leaf, as shown in the diagram:
Which disc, A, B, C, or D, would test positive for starch (turning blue-black with iodine)?
A
B
C
D
Photosynthesis Questions
Practise OCR GCSE Biology Photosynthesis with exam-style questions for Foundation and Higher tier. 31 questions, matched to the OCR GCSE Biology (J247) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.