Back to your test review

How many carboxylation reactions occur during CO2 fixation in sorghum and maize?

  • (a) 1 Your answer
  • (b) 2 Correct
  • (c) 3 Your answer
  • (d) 4 Your answer
Your answer: Correct answer: (b)
Advertisement

Explanation

Why (b) is correct

Sorghum and maize are C4 plants. CO2 is fixed twice: first by PEP carboxylase in the mesophyll, and again by RuBisCO in the bundle sheath. So there are two carboxylations.

Why the other options are wrong

  • (a) · your answer One carboxylation is the C3 pattern; C4 plants have two.
  • (c) · your answer There is no third carboxylation step.
  • (d) · your answer Only two carboxylases (PEPcase and RuBisCO) are involved.
NCERT point: Double carboxylation is a feature of all C4 plants.
What is wrong?
Thank you! We will check this question.
Practise Photosynthesis in Higher Plants
Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.
Start free test

Similar questions

Kranz anatomy refers to Photosynthesis in green algae and in photosynthetic bacteria is, respectively, Find the odd one with respect to double carboxylation.