Question

in an experiment light is essential for photosynthesis why does the uncovered part of the leaf turn blue black after putting iodine solution ​

Answer 1

starch is essential for the green areas and CO2 is essential for starch so iodine will reduce the CO2 content and it reduce the starch content so the uncover part of plant become dark blue after dip In to iodine

Answer 2

It's due to the presence of starch in the leaf....