In the experiment to show that sunlight is necessary for photosynthesis: (a) what is done to destarch the green leaves of the potted plant initially ? (b) What is done to a part of destarched leaf so that photosynthesis may not take place in that part of the leaf (before keeping the potted plant in sunlight) ? (C) How is chloroophyll removed from the green leaf before futher testing ? (d) which reagent is used to test teh presence/absence of starch in the parts of experimental leaf ?