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leaf is the main site of photosynthesis due to following ways : -
⇒ presence of high amount of chlorophyll .( absorbs light energy  )
⇒ presence of transparent epidermis ( which allows sunlight to reach chloroplast )  .
⇒ only  the leaf stomata are present  .( for gaseous exchange & transpiration ) 

⇒ leaf are exposed toward sunlight . 
      by the above points it is clear that leaf is the main site for photosynthesis. 

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Because it contains chloroplast which is site of photoshynthesis n chlorophyll is the site of trapping solar energy.
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