According to my point of view black paper will absorb more light. So, I think that indirectly the leaves will be in contact of sunlight........... Why wouldn't we have used white paper as, white cloths reflect sunlight...........

no , u r wrong 

only the black paper absorbs the sunlight not the leaf. the sunlight dosent transfer after being absorbed

so the only differnence between white and dark paper is the absorbtion of light in the black paper but that dosent mean the leaf absorbs the sunlight absorbed by the paper.

therefore it dosent matter what color ur paper is , the result is the same

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