CBSE Class 10 Answered

a plant with varigated leaves as of coleus is taken n leaves r destarched by keeping in dark room for a few days

then plant is placed in sun n a leaf is plucked its outline is made on paper n green n non green areas r marked

leaf is then tested for presence of starch only green part turn bluish showing presence of starch

precautions     leaf should b properly destarched

                                     green n nongreen  areas shud b properly markeed