Class 11 Biology — Chapter 12: Respiration in Plants
60 practice questions · 20 Easy · 20 Medium · 20 Hard
Practise Class 11 Biology Chapter 12, "Respiration in Plants", with 60 NCERT-aligned multiple-choice questions. The set is split into 20 Easy, 20 Medium and 20 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and NEET UG.
"Respiration in Plants" is one of the chapters where diagram-based recall, terminology and NCERT line-by-line accuracy really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Respiration in Plants, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Biology mastery score. A few sample questions are shown below; sign in free to practise all 60.
Key concepts: Respiration in Plants (Class 11 Biology)
This chapter covers cellular respiration — glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient.
- Glycolysis
- Glucose is broken to pyruvate in the cytoplasm, yielding a net 2 ATP and 2 NADH; common to all organisms.
- Krebs cycle
- In the mitochondrial matrix, pyruvate (as acetyl-CoA) is fully oxidised, releasing CO₂ and reduced coenzymes.
- Electron transport chain
- On the inner mitochondrial membrane, NADH/FADH₂ drive ATP synthesis (oxidative phosphorylation), with O₂ as final acceptor.
- Fermentation
- Anaerobic breakdown of glucose to ethanol or lactic acid, yielding only 2 ATP per glucose.
- Respiratory quotient
- RQ = CO₂ released / O₂ consumed; depends on the substrate (1 for carbohydrates, <1 for fats).
Key formulas — Respiration in Plants
💡 Exam tips for Respiration in Plants
- Aerobic respiration yields far more ATP (~36–38) than fermentation (only 2) per glucose.
- RQ = 1 for carbohydrates, <1 for fats/proteins, and >1 only for organic acids.
Sample questions
Glycolysis occurs in the:
Universal cytosolic pathway.
Krebs cycle takes place in:
Citric acid cycle in matrix.
Anaerobic fermentation in yeast yields:
Alcoholic fermentation.
Respiration in Plants — FAQs
What are the key concepts in Class 11 Biology Respiration in Plants?+
This chapter covers cellular respiration — glycolysis, the Krebs cycle, the electron transport chain, fermentation, and the respiratory quotient. Key ideas include Glycolysis, Krebs cycle, Electron transport chain, Fermentation, Respiratory quotient.
What does Class 11 Biology Chapter 12 (Respiration in Plants) cover on XamBaaz?+
It covers 60 NCERT-aligned MCQs on "Respiration in Plants" — 20 Easy, 20 Medium and 20 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and NEET UG.
Are these "Respiration in Plants" questions free to practise?+
Yes — sign in with Google to practise "Respiration in Plants" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Respiration in Plants" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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