Question

In which cells of leaf, pyruvate is converted to PEP in C${}_4$ pathway?

• A. Epidermal cells
• B. Mesophyll cells
• C. Bundle sheath cells
• D. Guard cells

Answer 1

The correct option is B Mesophyll cells

In C${}_4$ plants, initial fixation of CO${}_2$ occurs in mesophyll cells. The primary acceptor of CO${}_2$ is phosphoenolpyruvate (PEP). CO${}_2$ is again fixed inside bundle sheath cells through the Calvin cycle. The pyruvate is sent back to mesophyll cells where it is changed to phosphoenolpyruvate (PEP).

So, the correct answer is 'Mesophyll cells'.