activity to demonstrate that sunlight is essential for photosynthesis
Answers
Things needed:A potted plant, a beaker,a Bunsen burner ,alcohol,iodine solution. a dropper, boiling tube, test tube holder, petri dish, a thick black paper,wire gauze and tripod stand
Caution:Do not heat alcohol directly because it catches fire.
Method:
1.Take a healthy potted plant and keep it in a dark room for 2-3 days to destarch the leaves
2.Cover one of its leaves partly with a strip of black paper and put the plant in sunlight for a few hours
3.Pluck this covered leaf and remove the black strip.
4.Remove the green-coloured chlorophyll from the leaf by boiling it first in water and then in alcohol.In this way, yo get a decolourised leaf.Wash the leaf with water again.
5.Add a few drops of iodine on the colourless leaf and observe
Observation:You see that the part of the leaf covered with black paper does not turn blue-black on adding iodine solution while the uncovered parts turn blue-black.
Discussion:It is because the covered part of the leaf could not get sunlight,hence,no starch is formed in this part.
Conclusion:This shows that sunlight is needed for making starch, i.e; sunlight is necessary for photosynthesis.
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