Question

Which of these is incorrect for $C_4$ plants?

• A. Kranz anatomy
• B. $C{O}_2$ acceptor is PEP
• C. PEPCase in mesophyll
• D. RuBisCO in mesophyll

Answer 1

Answer: (D)

Among the given options, option (d) is incorrect about $C_4$-plants. The mesophyll cells of $C_4$-plants do not possess $RuBisCO$ enzyme. $C_4$-plants show Kranz anatomy. In these plants, the initial fixation of $C{O}_2$ occurs in mesophyll cells. The primary acceptor of $C{O}_2$ is Phosphoenol Pyruvate or PEP. It combines with $C{O}_2$ in the presence of PEP carboxylase or PEPCase to form oxaloacetic acid or oxaloacetate.