Activity 1.1 science take two potted plants of the same kind keep one in the dark or in a black box for 72 hours and the other in sunlight perform iodine test with the leaves both the plants as you did in class 6th.record your results now leave the pot which was earlier kept in the dark in sunlight for 3-4 days and perform the iodine test again on it's leaves
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Photosynthesis:
Plants prepare their food by a process called photosynthesis.
Photosynthesis, as the name says, requires sunlight.
In this process, plants take carbon dioxide and water to form sugar and release oxygen as a by-product.
The sugar thus formed is converted into starch. Starch gives a blue-black colour with iodine.
Inference of the experiment:
The leaf placed in a dark room could not photosynthesize as there was no light and hence starch was not produced.
Thus the leaves do not turn blue-black and remain brown with iodine.
The leaf that was placed in the light, produces starch and hence turns blue-black with iodine.
Only the leaf of the plant kept in sunlight turns blue black.
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