Question
The ratio of carbon dioxide fixation between C4 plants and C3 plants is:
2:1
2:3
1:1
1:2
C4 plants lack the process of photorespiration , which is a wasteful process present in C3 plants where RuBisCO binds with O2 instead of CO2, leading to a loss of fixed carbon . Because C4 plants possess a mechanism to increase intracellular CO2 concentration , they ensure RuBisCO functions as a carboxylase. This makes C4 plants photosynthetically more efficient, showing greater productivity of biomass compared to C3 plants . This efficiency is generally cited as being approximately double that of C3 plants, giving a ratio of 2:1.
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Photosynthesis in Higher Plants . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
More Photosynthesis in Higher Plants Questions
Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
In Hatch and Slack pathway, the primary CO2 acceptor is -
Which of the following statements about RuBisCO is true?
Oxygen is not produced during photosynthesis by:
During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?
Match List-I with List-II: List-I A. C4 Pathway B. Light reaction C. Photorespiration D. Calvin cycle List-II I. 2H2O → 4H+ + O2 + 4e- II. Ribulose 1,5-bisphosphate III. 3-carbon molecule, phosphoenol pyruvate IV. Phosphoglycolate
Given below are two statements: Statement I: RuBisCO is the most abundant enzyme in the world. Statement II: Photorespiration does not occur in C4 plants. In the light of the above statements, choose the most appropriate answer from the options given below:
Why 32,000+ students choose TopperSquare
15,000+ Chapter MCQs
Physics, Chemistry, Biology — chapter-wise, topic-wise practice
AI Performance Analytics
Know your weak topics. Get a personalised study plan.
Full NEET Mock Tests
180 questions, timed, with detailed score analysis
PYQ Sets 2010–2024
15 years of past papers with solved explanations
No credit card · 30-second signup · Free forever plan included
This neet biology practice question is part of the TopperSquare free question bank. TopperSquare offers 15,000+ chapter-wise NEET MCQs across Physics, Chemistry, and Biology with detailed step-by-step explanations, full mock tests, NEET PYQs (2010–2024), and an AI-powered performance analytics dashboard. browse all neet practice questions → · practice biology sets →
Sign in to save your score, view detailed analytics, and bookmark tough questions for revision.
Sign In / Join FreeChapter-wise practice sets
Identify weak areas instantly
Step-by-step logic for every question