AP BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘In C3 plant-mesophyll cell and In C4 plant-Bundle sheath cell’.

Detailed explanation-2: –Mesophyll cells are the site of photosynthesis in C3 plants.

Detailed explanation-3: -In C4 plants, oxaloacetic acid (OAA) is formed upon carbon fixation in mesophyll cells. The OAA is transported to bundle sheath cells, where it is reduced to malic acid. The malic acid undergoes decarboxylation and produces CO2 and pyruvic acid. CO2 is then fixed through Calvin cycle in the bundle sheath cells.

Detailed explanation-4: -In the C3 plants, the first compound form is of 3 carbon (PGA) while in C4 plants the first compound is of 4 carbon (OAA). The Calvin cycle takes place in the mesophyll cells. The Calvin cycle takes place in the bundle sheath cells. The initial carboxylation reaction occurs in the mesophyll cells.

Detailed explanation-5: -The C3 pathway occurs in the leaves’ mesophyll cells, whereas the C4 pathway occurs in the leaves’ mesophyll and bundle sheath cells. When compared to the C4 pathway, the C3 pathway has a slower carbon-fixation process.