NEET 2025 · BiologyPrevious Year Question
Which of the following statements about RuBisCO is true?
Answer: (B) It catalyzes the carboxylation of RuBP.. In the Calvin cycle, the enzyme RuBP carboxylase (RuBisCO) catalyses carboxylation, where CO2 is added to the 5-carbon RuBP to form two molecules of 3-PGA.
- A.It is an enzyme involved in the photolysis of water.
- B.It catalyzes the carboxylation of RuBP.✓
- C.It is active only in the dark.
- D.It has higher affinity for oxygen than carbon dioxide.
Correct Answer
(B) It catalyzes the carboxylation of RuBP.
Solution & Explanation
In the Calvin cycle, the enzyme RuBP carboxylase (RuBisCO) catalyses carboxylation, where CO2 is added to the 5-carbon RuBP to form two molecules of 3-PGA. Water photolysis is done by the water-splitting complex of PS II, not RuBisCO, so the other options are wrong. Thus RuBisCO catalyses the carboxylation of RuBP. NCERT: Class 11 Ch 11, p.143 [143:038]: "where CO2 is utilised for the carboxylation of RuBP. This reaction is"
🎯
43,000+ questions in हिंदी & English · one-tap toggle
Open →📚Practice all NEET Biology PYQs chapter-wise →💡Don't get it? Learn the Photosynthesis in Higher Plants concepts →Practice NEET 2025 Biology — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
More NEET PYQ solutions
BiolWhich one of the following is an example of ex-situ conservation?BiolWhich of the following is an example of a zygomorphic flower? (NEET 2025)BiolWhich of the following is an example of actinomorphic flower? (NEET 2024)BiolIn the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called : (NEET 2025)BiolGiven below are two statements: Statement I : In a floral formula the symbol [percentage/division-type symbol] stands for zygomorphic nature of the flower, and G with a bar above it stands for inferior ovary. Statement II : In a floral formula the symbol [same symbol] stands for actinomorphic nature of the flower and G with a bar below it stands for superior ovary. In the light of the above statements, choose the correct answer from the options given below: (NEET 2025)BiolMatch List I with List II: List I — A. Scutellum; B. Non-albuminous seed; C. Epiblast; D. Perisperm. List II — I. Persistent nucellus; II. Cotyledon of Monocot seed; III. Groundnut; IV. Rudimentary cotyledon. Choose the option with all correct matches. (NEET 2025)BiolGiven below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence. A. Prothallus stage B. Meiosis in spore mother cells C. Fertilisation D. Formation of archegonia and antheridia in gametophyte. E. Transfer of antherozoids to the archegonia in presence of water. Choose the correct answer from the options given below:BiolThe correct sequence of events in the life cycle of bryophytes is A. Fusion of antherozoid with egg. B. Attachment of gametophyte to substratum. C. Reduction division, to produce haploid spores. D. Formation of sporophyte. E. Release of antherozoids into water. Choose the correct answer from the options given below: