Back to your test review

Which is the first CO2-fixing enzyme in C4 plants?

  • (a) PEP carboxylase Correct
  • (b) RuBisCO Your answer
  • (c) phosphoric acid Your answer
  • (d) RuDP carboxylase Your answer
Your answer: Correct answer: (a)
Advertisement

Explanation

Why (a) is correct

In C4 plants, CO2 is first fixed in the mesophyll cells by PEP carboxylase (PEPcase).

Why the other options are wrong

  • (b) · your answer RuBisCO acts later, in the bundle sheath cells.
  • (c) · your answer Phosphoric acid is not an enzyme.
  • (d) · your answer RuDP carboxylase is another name for RuBisCO, which is the second carboxylase in C4 plants.
NCERT point: C4 plants have two carboxylases: PEPcase in the mesophyll and RuBisCO in the bundle sheath.
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

In C4 plants, CO2 first combines with In C4 plants, the initial CO2 fixation is carried out by Which one is a C4 plant?