Asked by  | 22nd May, 2009, 03:14: PM

Expert Answer:

Take a plant like croton or coleus. The leaves of the plant show white or yellow spots. At these spots, chlorophyll is absent.

Keep this plant in sunlight for some hours before starting the experiment. Then detach a leaf and keep in warm alcohol till all the chlorophyll is dissolved.

Later on wash the leaf with tap water and immerse it in the iodine solution. Starch will take a bluish colour in that part of the leaf which was having chlorophyll. The part of the leaf which was devoid of chlorophyll will not turn blue black at those spots.

Thus it can be seen that chlorophyll pigment is necessary for photosynthesis.

Answered by  | 23rd May, 2009, 08:12: PM

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