IMMUNOLOGY

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

Detailed explanation-2: -The carbon-fixation pathway begins in the mesophyll cells, where carbon dioxide is converted into bicarbonate, which is then added to the three-carbon acid phosphoenolpyruvate (PEP) by an enzyme called phosphoenolpyruvate carboxylase.

Detailed explanation-3: -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.