The diagram shows a destarched, variegated leaf, partly covered by black paper. The plant is placed in bright light for several hours.
Four discs were then cut from the leaf in the positions (1 - 4) as shown in the figure and were tested for starch. Which disc contains starch?
A1 only
B1 and 2 only
C2 only
D3 and 4 only
Part 1 Should be starching as it is theonly one "in sunlight for several hours"