Question

The $C{O}_2$ fixation during $C_4$ pathway occurs in the chloroplast of

• A. Guard cells
• B. Bundle sheath cells
• C. Mesophyll cells
• D. Spongy parenchyma

Answer 1

The correct option is C Mesophyll cells

The Carbon fixation pathway in C${}_4$ plants begins in mesophyll cells, where the CO${}_2$ gets converted to bicarbonate, which is then added to the three-carbon acid phosphoenolpyruvate (PEP) by the action of enzyme phosphoenolpyruvate carboxylase.

So, the correct answer is 'Mesophyll cells'.