Answer :

a. Sunlight is required for photosynthesis. This experiment shows that sunlight is an important factor that is required for photosynthesis. Because in absence of sunlight glucose cannot be synthesized by the leaves of the plant.


b. The plant was kept in dark for 24-48 hours to destarch the plant so that whole stored starch would be used up by the plant and it will not interfere on the experiments of photosynthesis.


c. First the leaf is placed in boiling water followed by boiling the leaf in methylated spirit which removes chlorophyll. Then iodine solution is poured over leaf. The blue-black colour will indicate the presence of starch whereas brown colour will indicate absence of starch.


d. Carbon dioxide, water and chlorophyll are required for photosynthesis.


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