If one perform the starch test with variegated leaves, what section of the leaf where one expect to find starch ?

Variegated leaves are those that are not completely green
in color but there are areas on the leaves that are white in color. This is due to the
absence of plastids or mutant plastids that cannot produce the chlorophyll
pigment essential for photosynthesis.

If a variegated leaf
were to be soaked in alcohol to remove all the pigmentation and then an iodine test were
to be performed, the areas on the leaf that were originally green will show the presence
of starch while the portions that were originally white will not give a positive
result.

Photosynthesis is essential for the production of
monosaccharides and their storage in the plant as starch. The iodine test can only
detect starch. In areas of the leaf that are white and where photosynthesis does not
take place monosaccharides are not produced which in turn does not allow their storage
as starch.