C3 and C4 PHOTOSYNTHESIS

      c3 and c4 plants:

.In C3 Plants a Three Carbon Compound Called PGA Is
 Formed As The First Detected Product Of Photosynthesis
 While
 In C4 Plants a Four Carbon Compound Called Oxaloacetate
 As The First Product Of Carbondioxide Fixation In Dark            Reactions Of Photosynthesis.
.In C3 Plants Chloroplasts Are Present Only In Mesophyll Cells
 Of Leaf.
 However In C4 Plants Chloroplasts Are Present Both In      Mesophyll Cells And In Bundle Sheath Cell.
.C3 Plants Use Rubisco To React Carbondioxide With RUBP .    
 On The Other Hand C4 Plants Use Another Enzyme Called          PEPCO  To Fix Carbondioxde