how will you prove with black screen experiment?
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Answer: During the experiment, the uncovered portion received light and hence photosynthesis took place in this part. Because of this, starch is formed in the uncovered portion. This starch with iodine gives blue-black colour.Experiment to show that sunlight is necessary for photosynthesis - definition
Take a plant with destarched leaf.
Leaf is partially covered with black paper on which a design is cut.
Expose this plant to sunlight for few hours and perform a starch test with iodine solution.
The presence of starch is regarded as evidence of photosynthesis. Hence before starting an experiment on photosynthesis, the plant should be placed in the dark for 24-48 hours to destarch the leaves. ... So the various experiments on photosynthesis can be carried out effectively.
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