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Question: Answered & Verified by Expert
Which of these is incorrect for $\mathrm{C}_4$-plants?
BiologyPhotosynthesis in Higher PlantsJIPMERJIPMER 2018
Options:
  • A Kranz anatomy
  • B $\mathrm{CO}_2$ acceptor is PEP
  • C PEPCase in mesophyll
  • D RuBisCO in mesophyll
Solution:
2760 Upvotes Verified Answer
The correct answer is: RuBisCO in mesophyll
Among the given options, option (4) is incorrect about $\mathrm{C}_4$-plants. The mesophyll cells of $\mathrm{C}_4$-plants do not possess RuBisCO enzyme. $\mathrm{C}_4$-plants show Kranz anatomy. In these plants, the initial fixation of $\mathrm{CO}_2$ occurs in mesophyll cells. The primary acceptor of $\mathrm{CO}_2$ is Phosphoenol Pyruvate or PEP. It combines with $\mathrm{CO}_2$ in the presence of PEP carboxylase or PEPCase to form oxaloacetic acid or oxaloacetate.

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