Aim : to prove that sunlight is necessary for photosynthesis.
MATERIALS REQURIED : de starched plant,iodine solution,petri dish,black paper.
1. take a plant with de stached leaves
2.cover one of its leaves with black paper on which a design is cut.Fix the paper on the leaf in such a manner that light doesnot enter the dark part.
3.place the in sun light.
4.after few hours of exposure to bright sun light,test the leaf which is covered by black paper for the presence of starch.
5.it will be observed that only the parts of the leaf,which could get light through the cut out design,turns blue - black showing the presence of starch.
OBSERVATION:the part which is covered with black paper does not turn blue black.
INFERENCE : we can infer that sun light is necessary for photosynthesis..