CBSE Class 11 Biology Respiration in Plants MCQs Set 04

Question. The F1 headpiece is a
a) carrier protein.
b) integral membrane protein complex.
c) peripheral membrane protein complex.
d) transmembrane protein.
Answer: c

Question. Acceptor of acetyl Co-A in Kreb’s cycle is
a) fumaric acid
b) oxaloacetic acid
c) a-keto glutaric acid
d) malic acid
Answer: b

Question. Terminal cytochrome of respiratory chain which donates electrons to oxygen is
a) cyt. c
b) cyt. a₃
c) cyt.
d) cyt. b
Answer: b

Question. Refer the given equation and answer the question.
2(C₅1H₉₈O₆) + 145O₂ → 102CO₂ + 98H₂O + Energy
The R.Q of above reaction is
a) 1.45
b) 1.62
c) 0.7
d) 1
Answer: c

Question. In citric acid cycle, energy bond (GTP) is produced as a result of conversion of
a) succinic acid to malic acid.
b) citric acid to α-keto glutaric acid.
c) succinic acid to succinyl – CoA.
d) succinyl – CoA to succinic acid.
Answer: d

Question. Electron Transport System (ETS) is present in
a) chloroplast.
b) mitochondrial matrix.
c) inner mitochondrial membrane.
d) chlorophyll.
Answer: c

Question. The correct sequence of electron acceptor in ATP synthesis is
a) cyt c b a a₃
b) cyt b c a₃ a
c) cyt a a b c
d) cyt b c a a₃
Answer: d

Question. The main purpose of electron transport chain is to
a) use the intermediates from TCA cycle
b) breakdown pyruvate
c) cycle NADH + H+ back to NAD+
d) all of the above
Answer: c

Question. The overall goal of glycolysis, Kreb’s cycle and the electron transport system is the formation of
a) ATP in small stepwise units
b) sugars
c) nucleic acids
d) ATP in one large oxidation reaction
Answer: a 

Statement Type Questions

Question. Which of the following statement regarding pyruvate during aerobic respiration is incorrect?
a) Two molecules of NADH are produced from the metabolism of two molecules of pyruvic acid.
b) It enters mitochondrial matrix & undergoes oxidative decarboxylation.
c) It is formed by the glycolytic catabolism of carbohydrates in the mitochondrial matrix.
d) The conversion of pyruvic acid to acetyl CoA is catalysed by pyruvic dehydrogenase.
Answer: c

Question. Which of the following is incorrect regarding the Kreb’s cycle?
a) It does not involve any decarboxylation step.
b) It occurs in mitochondria.
c) It is also known as tricarboxylic acid cycle.
d) It starts with six carbon compound.
Answer: a

Question. Which of the following statement(s) concerning ATP synthesis is/are correct?
a) ATP can be synthesized through substrate level phosphorylation, photophosphorylation and oxidative phosphorylation.
b) Proton-motive force is essential for back flow of H⁺ from outer chamber to matrix of mitochondria through F₀ of F₀–F₁ particle to produce ATP.
c) The proton-motive force is the establishment of proton gradients and electrochemical potentials across the inner membrane.
d) All of the above
Answer: d

Question. Which of the following statement is correct in relation to the ETS?
a) In respiration, light energy is utilized for the production of proton gradient.
b) Oxidation of one molecule of NADH gives rise to 2 molecules of ATP, while one molecule of FADH₂ produces 3 molecules of ATP.
c) Oxygen acts as the final hydrogen acceptor.
d) It is present in the mitochondrial matrix.
Answer: c

Question. Which of the following statements (i to v) regarding glycolysis are correct?
(i) It is ten enzymatic reactions that convert a six-carbon molecule to a three-carbon pyruvate with net gain of 2 ATP.
(ii) Glucose undergoes partial oxidation to form one molecule of pyruvic acid.
(iii) Glucose is phosphorylated to glucose-6-phosphate by phosphofructokinase.
(iv) The pathway was given by Embden, Meyerhof and Parnas (EMP pathway).
(v) ATP is utilized in conversion of glucose to glucose-6-phosphate and fructose-6-phosphate to fructose-1,6-bisphosphate.
a) (iv) and (v)
b) (iii) and (v)
c) (ii) and (iv)
d) (i), (iv) and (v)
Answer: d

Critical Thinking Type Questions 

Question. In mitochondria, protons accumulate in the
a) matrix
b) inner membrane
c) inter membrane space
d) outer membrane
Answer: c

Question. Respiration is the breakdown of
a) C-H bonds
b) C-N bonds
c) C-C bonds
d) H-H bonds
Answer: c

Question. Which one of the following is complex V of the ETS of inner mitochondrial membrane?
a) Succinate dehydrogenase
b) ATP synthetase
c) NADH dehydrogenase
d) Ubiquinone
Answer: b

Question. During glycolysis, glucose split into
a) two lactic acid molecules
b) one lactic acid plus one ethanol molecule
c) two coenzyme A molecules
d) two pyruvic acid molecules
Answer: d

Question. How many molecules of ATP are produced during glycolysis?
a) 4
b) 2
c) 8
d) 6
Answer: b

Question. If hexokinase, an enzyme that catalyzes the first step reaction in glycolysis is blocked then what will be its impact on glycolytic pathway?
a) Glycolysis will speed up
b) Glycolysis will occur normally
c) Glycolysis will stop
d) Glycolysis will slow down
Answer: c

Question. Fermentation takes place
a) under aerobic conditions in all prokaryotes and unicellular eukaryotes
b) under anaerobic conditions in all prokaryotes and unicellular eukaryotes
c) under aerobic conditions in many prokaryotes and unicellular eukaryotes
d) under anaerobic conditions in many prokaryotes and unicellular eukaryotes
Answer: d

Question. Life without air would be
a) impossible
b) anaerobic
c) reductional
d) free from oxidative damage
Answer: b

Question. Which of the following is correct sequence in Kreb’s cycle?
a) Oxalosuccinic acid → Isocitric acid → α-ketoglutaric acid
b) α-ketoglutaric acid → Isocitric acid → Oxalosuccinic acid
c) Isocitric acid → α-ketoglutaric acid → Oxalosuccinic acid
d) Isocitric acid → Oxalosuccinic acid → α-ketoglutaric acid
Answer: d

Question. For bacteria to continue growing rapidly when they are shifted from an environment containing O₂ to an anaerobic environment, they must
a) increase the rate of TCA cycle
b) produce ATP during oxidation of glucose
c) increase the rate of glycolysis
d) produce more ATP per mole of glucose during glycolysis
Answer: c

Question. Initial step of TCA cycle to yield citric acid starts with the condensation of
a) acetyl group with pyruvate & H₂O & catalysed by citrate synthase
b) acetyl group with OAA & H₂O & catalyzed by citrate synthase
c) acetyl group with OAA & H₂O & independent of enzyme
d) none of the above
Answer: b

Question. In Kreb’s cycle, the conversion of succinyl CoA to succinic acid requires
a) Acetyl CoA + GDP + iP
b) CoA + GTP + iP
c) GDP + iP
d) Acetyl CoA + GTP + iP
Answer: c 

Matching Type Questions

Question. In the given columns, column-I contain complexes and column-II contain their alternative names. Select the correct match from the option given below.

Column – I                             Column – II
A. Complex I                          I. Cytochrome bc 1 complex
B. Complex II                        II. NADH dehydrogenase
C. Complex III                      III. ATP synthetase
D. Complex IV                      IV. FADH2 dehydrogenase
E. Complex V                        V. Cytochrome c oxidase

(a) A – III; B – V; C – I; D – IV; E – II
(b) A – II; B – V; C – I; D – IV; E – III
(c) A – II; B – IV; C – I; D – V; E – III
(d) A – IV; B – I; C – II; D – V; E – III
Answer: c

Question. Which of the following is incorrectly matched?
(a) Protein → Degarded by proteases
(b) Fats →  Fatty acid + PGAL
(c) Kreb’s cycle → Carboxylation
(c) Respiratory pathway →  Amphibolic
Answer: c