a) How would you destarch the leaves of a potted plant?

b) How would you check that the destarching had been effective?

a) If a potted plant is kept in darkness for 48 hours, all starch in its leaves should have been changed to sugars and conducted out of the leaves. This is destarching.

(b) To check on the destarching, single of the leaves or part of a leaf should be tested with iodine  to make sure the leaf is free from starch.