RuBisCO Activity in C₄ vs C₃ Plants — NEET Biology
📚 Practice ConceptRuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in C₄ plants?
Assertion (A): RuBisCO is the most abundant enzyme in the world. Reason (R): RuBisCO acts both as a carboxylase and oxygenase enzyme in plants.
View solution & NCERT explanation
Correct answer: B — If both assertion and reason are true but reason is not the correct explanation of the assertion.
NCERT states “RuBisCO that is the most abundant enzyme in the world” (Assertion true). NCERT also states “RuBisCO is an enzyme that acts both as a carboxylase and oxygenase” (Reason true). However, the Reason describes the dual function of RuBisCO but doesn’t explain WHY this makes it the most abundant enzyme - abundance relates to its universal presence in photosynthetic organisms, not directly to its dual function.
What does NCERT say about RuBisCO enzyme that acts?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.