The steps, necessary for setting up the experiment, “To demonstrate that light is necessary for photosynthesis” are not given here in proper sequence. I.
Keep the potted plant in sunlight for 3 to 4 hours. II. Keep the potted plant in darkness for about 48 hours. III. Cover a leaf of the plant with a strip of black paper. IV. Pluck the leaf and test it for starch. The correct sequence of steps is: (1) I, III, IV, II (2) I, IV, III, II (3) II, IV, III, I (4) II, III, I, IV