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Respiration in Plants Class 11 NEET Questions. We covered all the Respiration in Plants Class 11 NEET Questions in this post for free so that you can practice well for the exam.
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mcq on Respiration in Plants for NEET Students
When the respiratory quotient (RQ) equals 1, which condition is accurate?
(a) Glucose is used and Respiration is anaerobic with yeast
(b) Glucose is the substrate and Respiration is aerobic
(c) Fats are broken down in anaerobic conditions
(d) Either fats or glucose undergo anaerobic Respiration
Option b – Glucose is the substrate and Respiration is aerobic
During the breakdown of glucose to pyruvate, which process does not occur?
(a) ATP is both consumed and generated
(b) Hexose sugar is phosphorylated
(c) Carbon dioxide is released
(d) NAD⁺ is reduced
Option c – Carbon dioxide is released
Which of the following pathways serves both catabolic and anabolic functions?
(a) Citric Acid cycle
(b) Electron Transport chain
(c) Calvin cycle
(d) Glycolysis
Option a – Citric Acid cycle
Maximum energy release occurs in which stage of Respiration?
(a) Conversion of pyruvate to acetyl CoA
(b) Breakdown of glucose into pyruvate
(c) Fermentation of glucose to lactic Acid
(d) Oxidation of pyruvate into carbon dioxide and water
Option d – Oxidation of pyruvate into carbon dioxide and water
How many oxygen molecules are needed for the conversion of one glucose Molecule to ethanol?
(a) Two
(b) Six
(c) Zero
(d) Four
Option c – Zero
To generate 26 pyruvate molecules via glycolysis, how many glucose molecules are required?
(a) 26
(b) 52
(c) 13
(d) 32
Option c – 13
Identify the incorrect feature of ATP synthase.
(a) It is referred to as Complex V in the electron Transport chain
(b) F₁ part is a peripheral protein
(c) Fo portion spans the membrane
(d) F₁ component forms the proton channel
Option d – F₁ component forms the proton channel
Which of the following is not associated with the function of the electron Transport system?
(a) Produces a large amount of ATP
(b) Consumes water formed during the Krebs cycle
(c) Produces 34 ATP out of 38 ATP per glucose
(d) Regenerates oxidized NAD and FAD from their reduced forms
Option b – Consumes water formed during the Krebs cycle
Which component is not required for pyruvate to be converted into acetyl CoA?
(a) NAD⁺
(b) Coenzyme A
(c) Pyruvate decarboxylase
(d) Pyruvate dehydrogenase
Option c – Pyruvate decarboxylase
Which type of biomolecule is typically used first during cellular Respiration?
(a) Lipids
(b) Proteins
(c) Carbohydrates
(d) Lactic Acid
Option c – Carbohydrates
Which of the following statements is incorrect regarding the reaction:
Pyruvic Acid + 4NAD⁺ + FAD + 2H₂O + ADP + Pi → 3CO₂ + 4NADH + 4H⁺ + FADH₂ + ATP?
(a) It takes place in the cytoplasm
(b) It represents the Krebs cycle
(c) Occurs in the mitochondrial matrix
(d) It is a part of aerobic Respiration
Option a – It takes place in the cytoplasm
The fate of pyruvic Acid is determined by the presence of
(a) Glucose
(b) Pyruvate
(c) Carbon dioxide
(d) Oxygen
Option d – Oxygen
Which of the following contributes to pyruvate production during respiration?
i. Dihydroxyacetone phosphate
ii. Glucose-6-phosphate
iii. Fatty Acids
iv. Amino Acids
(a) i, iii, iv
(b) ii, iii, iv
(c) i, ii, iii
(d) i, ii, iv
Option d – i, ii, iv
Fill in the analogy: Complex II : FADH₂ :: Complex I : ?
(a) ATP synthase
(b) Cytochrome c oxidase
(c) Cytochrome bc₁
(d) NADH dehydrogenase
Option d – NADH dehydrogenase
Choose the correct definition of oxidative phosphorylation:
Statement I: It is the formation of ATP by transferring phosphate from a substrate to ADP.
Statement II: It is the synthesis of ATP using energy from electrons released during oxidation.
(a) Only Statement I
(b) Only Statement II
(c) Both statements I and II
(d) Neither I nor II
Option b – Only Statement II
Which of the following matches correctly: reaction – location – end product?
(a) Glycolysis – Cytosol – Pyruvate
(b) Oxidative decarboxylation – Inner mitochondrial membrane – Pyruvate
(c) Oxidative phosphorylation – Inner mitochondrial membrane – Acetyl CoA + CO₂
(d) Krebs cycle – Cytoplasm – Oxaloacetate + CO₂
Option a – Glycolysis – Cytosol – Pyruvate
What accurately describes oxidative phosphorylation?
(a) Formation of ATP during photosynthesis
(b) ATP production during cellular respiration
(c) NADPH generation in photosynthesis
(d) Synthesis of pyruvate during glycolysis
Option b – ATP production during cellular respiration
What is the RQ value for the reaction:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy?
(a) 0.7
(b) 0.5
(c) 0
(d) 1.0
Option d – 1.0
Identify the incorrect statement about substrate conversion before entering respiration.
(a) Fats are broken down into fatty Acids and glycerol
(b) Proteins are built from amino Acids
(c) Carbohydrates break down into simple sugars
(d) Fatty Acids convert into acetyl CoA
Option b – Proteins are built from amino Acids
Before entering the Krebs cycle, fats, carbohydrates, and proteins are first converted into
(a) Pyruvate
(b) Acetyl CoA
(c) Fructose-6-phosphate
(d) Glucose-6-phosphate
Option b – Acetyl CoA
What is correct regarding fermentation?
(a) The final product is pyruvate
(b) Produces 2 ATP molecules
(c) Yields 2 NADH₂ per glucose
(d) No NADH₂ is formed
Option d – No NADH₂ is formed
Which enzymes are not involved in lactic Acid fermentation?
(a) Pyruvate decarboxylase
(b) Alcohol dehydrogenase
(c) Lactate dehydrogenase
(d) Both (a) and (b)
Option d – Both (a) and (b)
Assertion: Terminal oxidation is the final step of aerobic respiration.
Reason: Electron Transport involves oxidative phosphorylation.
(a) Both assertion and reason are true; reason explains assertion
(b) Both are true; reason doesn’t explain assertion
(c) Assertion is true; reason is false
(d) Both are false
Option b – Both are true; reason doesn’t explain assertion
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