1. In respiration enregy not converted in ATP is(A) Liberated along with CO2

(B) Converted into heat(C) Transferred to organic compounds(D) Transferred to waterAnswer: (B)2. One gram mole of glucose on complete oxidation to CO2 and H2O produces about(A) 686,000 cal(B) 6,860 cal(C) 6,860,000 cal(D) 68,600 calAnswer: (A)3. In respiration, pyruvic acid is(A) Formed only when the cell is with mitochondria(B) Formed only when oxygen is available(C) Formed only when cell is performing aerobic respiration(D) Commonly formed as intermediate product of aerobic and anaerobic respirationAnswer: (D)4. What ultimately occurs during respiration is(A) Synthesis of ATP(B) Electron transport(C) break down of ATP(D) capture of solar energyAnswer: (A)5. Number of steps involved in release of CO2 during Kreb’s cycle are(A) 1(B) 2(C) 6(D) 12Answer: (B)6. RQ is(A) C/N(B) CO2/O2

(C) O2/CO2

(D) N/CAnswer: (B)7. Mitochondria do not occur in(A) Ferns(B) Bacteria(C) Green algae(D) Brown algaeAnswer: (B)8. Mitochondrial component connected with ATP synthesis(A) Inner membrane(B) Outer membrane(C) Matrix(D) F0 – F1 particlesAnswer: (D)9. Inner membrane involutions of a mitochondria are called(A) Lamellae(B) Cristae mitochondriales(C) Thylakoid(D) TubulesAnswer: (B)10. Mitochondrial criste are sites of(A) Kreb’s cycle

(B) Oxidation reduction reaction(C) Protein synthesis(D) Lipid synthesisAnswer: (B)11. Mitochondria are self replication organelles as they have(A) Thylakoids(B) Oxysomes(C) Ribosomes(D) DNAAnswer: (D)12. How many ATP are produced from NADH2 during aerobic respiration(A) 30(B) 8(C) 34(D) 2Answer: (B)13. The intermediate product of glycolysis which undergoes lysis or splitting is(A) Fructose 1-6 diphosphate(B) Dihydroxyacetone 3 phosphate(C) Glucose – 6 – phosphate(D) Glyceraldehyde – 3  phosphateAnswer: (A)14. Number of carbon atoms present in citric acid, oxaloacetic acid pyruvic acid are respectively(A) 6, 3 and 3(B) 6, 4 and 3(C) 5, 4 and 3(D) 6, 4 and 2Answer: (B)15. Removal of hydrogen and CO2 from substrate is called(A) Oxidation(B) Decarboxylation(C) Reductive carboxylation(D) Oxidative decarboxylationAnswer: (D)16. Aerobic respiration of one glucose produces(A) 12 NADH + 2FADH2 + 38 ATP(B) 12 NADH + 30 ATP + H2O(C) 8 NADH + 2FADH2 + 2ATP(D) 10 NADH2 + 2 FADH2 + 2 ATP + 2 GTPAnswer: (D)17. ETC and TCA enzyme soccurs in(A) Endoplasmic reticulum(B) Ribosomes(C) Mitochondria(D) CytoplasmAnswer: (C)18. End products of aerobic respiration are(A) Sugar and oxygen(B) Water and energy(C) Carbon dioxide and energy(D) Carbon dioxide, water and energyAnswer: (D)19. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as(A) HMS-pathway(B) TCA pathway(C) Glycolysis

(D) Kreb’s cycleAnswer: (C)20. Kreb’s cycle begins with the reaction(A) Citric acid + Acetyl CoA(B) OAA + Acetyl Co-A(C) OAA + Citric acid(D) OAA + Pyruvic acidAnswer: (B)21. Formation of lactic acid from pyruvic acid requires(A) Reduction(B) Oxidation(C) Decarboxylation(D) HydrationAnswer: (A)22. When a pair of electron from NADPH2 is transported through respiration ETS, it results in the formation of(A) 5 molecules of ATP(B) 4 molecules of ATP(C) 3 molecules of ATP(D) 2 molecules of ATPAnswer: (C)23. Oxidation step of glycolysis is(A) 1,3 di PGA  3 PGA(B) 3 PGAL  1, 3 diPGA(C) PGA  PEP(D) Fructose 1, 6 diphosphate  PGAl + DHAPAnswer: (B)24. Which of the following process is used in the conversion of pyruvate to acetyl CoA(A) Oxidative decarboxylation(B) Oxidative dehydrogenation(C) Oxidation phosphorylation(D) Oxidation dehydrationAnswer: (A)25. Enzymes taking part in glycolysis are present in(A) Vacuole(B) Mitochondria(C) Cytoplasm(D) Both (B) and (C)Answer: (C)1. Total number of water molecules produced per molecule of glucose during aerobic respiration is(A) 10(B) 6(C) 12(D) 8Answer: (B)2. Number of oxygen molecules required for glycolytic breakdown of one glucose molecule is(A) Three(B) Zero(C) Thirty eight(D) SixAnswer: (B)3. In aerobic respiration, first CO2 is liberated during(A) Oxidation of pyruvic acid(B) Decarboxylation of oxalosuccinic acid(C) Decarboxylation of  ketoglutaric acid

(D) Alcoholic fermentationAnswer: (A)4. Protoplasmic repiration is respiration(A) Occuring in protoplasm(B) Occuring in cytoplasm(C) when protein is respiration substrate(D) Occuring outside mitochondriaAnswer: (C)5. Oxidation of a molecule of acetyl Co-A produces(A) 12 ATP(B) 15 ATP(C) 6 ATP(D) 24 ATPAnswer: (C)6. Incomplete breakdown of sugars in anaerobic respiration forms(A) Glusoce and CO2

(B) Alcohol and CO2

(C) Water and CO2

(D) Sucrose and waterAnswer: (B)7. The number of molecules of pyruvic acid formed from one molecule of glucose at the end of glycolysis is(A) 1(B) 2(C) 3(D) 4Answer: (B)8. Oxysome is made up of(A) Stalk, head piece and tail piece(B) Stalk, head piece and base piece(C) Head as basal piece(D) Stalk and head pieceAnswer: (B)9. FADH2 is formed in conversion of(A) Succinyl CO-A succinic acid(B) Succinic acid-fumaric acid(C) Fumaric acid-malic acid(D) Isocitric acid-oxalosuccinic acidAnswer: (B)10. Muscle cell starved of oxygen and supplied with pyruvic acid will produce(A) CO2 only(B) Lactic acid(C) Ethonal(D) CO2 and H2OAnswer: (B)11. The organic acid formed last in aerobic respiration is(A) Citric acid(B) Pyruvic acid(C) Oxaloacetic acid(D) Phosphoglyceric acidAnswer: (C)12. As compared to anaerobic respiration the energy gained during aerobic respiration is ______ more(A) 6 times(B) 12 times(C) 18 times

(D) 19 timesAnswer: (D)13. Which is key intermediate compound linking glycolysis to Kreb’s cycle?(A) Malic acid(B) Acetyl Co-A(C) Pyruvic acid(D) Citric acidAnswer: (B)14. In TCA cycle, GTP is formed during conversion of(A) Succinyl Co-A into succinic acid(B) -ketoglularic acid to succinyl CO-A(C) Succinic acid to fumaric acid(D) Both (A) and (B)Answer: (A)15. Process of respiration in green plants takes place(A) only when photosynthesis is in open(B) Only when stomata are open(C) Only when photosynthesis cease(D) All the timesAnswer: (D)16. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as(A) TCA pathway(B) HMS pathway(C) HSK pathway(D) EMP pathwayAnswer: (D)17. Connectin link between EMP pathway and TCA cycle is(A) Pyruvic acid(B) Citric acid(C) Acetyl CO-A(D) Oxalosuccinic acidAnswer: (C)18. If 5 molecules of glucose respired aerobically and another 5 molecules anaerobically, how many ATP and CO2 are expected to form?(A) 200 ATP and 60 CO2

(B) 140 ATP and 40 CO2

(C) 200 ATP and 40 CO2

(D) 190 ATP and 36 CO2

Answer: (C)19. An organic acid which undergoes both dehydrogenation and decarboxylation in Kreb’s cycle(A) Sucinic acid(B) -ketoglytatric acid(C) Citric acid(D) malic acidAnswer: (B)20. Terminal oxidation means(A) Electron transport(B) Synthesis of ATP(C) Formation of water(D) Dehydrogenation of reactionAnswer: (C)21. Which of the folowing is mirochondrial stain(A) Gimsa green(B) Jenus Green B(C) Crystel Voilet(D) Jenus Green A

Answer: (B)22. The reaction converting pyruvate to acetyl CO-A is(A) Decarboxylation(B) Dehydrogenation(C) Oxidative decarboxylation(D) Both (A) and (B)Answer: (C)23. In mitochondria F1 particles are placed at a distance(A) 40 A (B) 50A(C) 80 A (D) 100 AAnswer: (D)24. The reaction which brings about formation of 3 PGA in the glycolysis involves(A) Dephosphorylation(B) Cleavage(C) Oxidative phosphorylation(D) Oxidative decarboxylationAnswer: (A)25. Removal of hydrogen and formation of ATP are commonly called as(A) Phosphorylation(B) Dephosphorylation(C) Dehydrogenation(D) Oxidative phosphorylationA1. The number of different 3-C compounds formed during glycolysis is(A) 4(B) 5(C) 6(D) 7Answer: (D)2. During aerobic respiration of one molecule of glucose, net water molecule are removed from the substrate during Kreb’s cycle is?(A) 10(B) 12(C) 6(D) 3Answer: (D)3. Out of the total available energy, the percentage of energy conserved as ATP in the anaerobic respiration of glucose comes to(A) 40%(B) 14.6%C) 60%(D) 2%Answer: (D)4. During terminal oxidation, the final electron acceptor of the ETS. is(A) free molecular oxygen.(B) Co-Q.(C) Cyt.a3

(D) the protons 2H+.Answer: (A)5. Enzymes required for Kreb’s cycle are located in(A) Outer chamber of mitochondria(B) Inner chamber of mitochondria(C) Mitochondria and cytoplasm(D) Cytoplasm onlyAnswer: (B)6. Usable energy avaliable from respiration is(A) 10%

(B) 40%(C) 60% (D) 30%Answer: (B)7. Metabolic water is the one(A) Used during photosynthesis(B) Produced during phtosynthesis(C) Produced during aerobic utilization of glucose(D) Produced during anaerobic utilization of glucoseAns (C)8. Out of 38 molecules of ATP produced by respiration of one glucose, the molecules produced from from NADH2 are(A) 22 ATP(B) 36 ATP(C) 30 ATP(D) 34 ATPAnswer: (C)9. Hydration reaction of Kreb’s cycle involves conversion of(A) Succinic acid to fumaric acid(B) Isocitric to oxalosuccinic acid(C) Fumaric acid to malic acid(D) Malic acid to oxaloacetic acidAnswer: (C)10. The second ATP molecule in electron transport system in generated between(A) Cyt C1 to b(B) Cyt C1 to c(C) Cyt b and C1

(D) Cyt C to aAns (C)11. The atom within each cytochrome molecule that actually accept and releases electron is(A) C(B) Fe(C) Zn (D) MgAns (B)12. Which of the following process will cause loss of net dry weight of organisms(A) Photosynthesis(B) Respiration(C) Growth(D) AssimilationAns (B)13. It is not advisable to sleep under trees as  (A) They release O2 at night(B) They release CO2 at night(C) They release both  O2 and CO2 at night(D) They produce none of  aboveAns (B)14. Inner membrane of mitochondria shows inward foldings for(A) Formation of cristae(B) Reducing mitochondrial matrix(C) Proving more space to produce maximum possible oxysomes(D) None of theseAnswer: (C)15. In complete aerobic respiration of glucose the only 5-C intermediate compound formed is(A) -ketogluataric acid(B) Ribulose diphosphate(C) Ribulose monophosphate

(D) Cis-aconitic acidAnswer: (A)16. Respiration is a(A) Anabolic process that uses O2 and CO2 to form ATP(B) Catabolic process that uses CO2, produces O2 and converts released eenrgy into ATP(C) Anabolic process that uses O2, produces CO2 and converts released energy into ATP(D) Catabolic process that uses O2, produces CO2 and converts released energy into ATPAnswer: (D)17. Most preferred substrate for respiration in plant is(A) Starch(B) Glycogen(C) Glucose(D) CelluloseAnswer: (C)18. In ETS cytochromes are arranged inseries of(A) cyt - c – a – a3

(B) cyt – a3 – a – c1

(C) cyt b – c1 – c – a – a3

(D) cyt b – a3– a – c1 – cAnswer: (C)19. Which one yield highest energy per gram(A) Carbohydrate(B) Protein(C) Amino acid(D) FatAnswer: (D)20. In which of the following step, can ATP be produced?(A) Glucose to glucose phosphate(B) Phosphoenol pyruvic acid to pyruvic acid(C) Cisaconitic acid to isocitric acid(D) Fumaric acid to malic acidAnswer: (B)21. The total mechanism of aerobic respiration completes in the(A) Cytoplasm and Iysosomes(B) Cytoplasm and chloroplast(C) Cytoplasm, chloroplast, mitochondria(D) Cytoplasm and mitochondriaAnswer: (D)22. _____ Kcal energy is conserved as 38 ATP molecules in cellular respiration of one glucose molecule(A) 277 Kcal(B) 654 Kcal(C) 456 Kcal(D) 686 KcalAnswer: (A)23. The second ATP molecule in electron transport system in generated between(A) Cyt C1 to b(B) Cyt C1 to c(C) Cyt b and C1(D) Cyt C to aAnswer: (C)24. When prteins are respiratory substrate it is called as ____________ .(A) Floating respiration(B)  Chlimeteric(C) Protoplasmic(D)  Dark

Answer: (C)25. In oxidative phosphorylation, one molecule of reduced FAD produces, how many ATP?(A) Zero(B) Two(C) Three(D) FourAnswer: (D)nswer: (D)

1. A 5-carbon compound of Krebs cycle is a key compound in nitrogen metabolism. It is(a) Citric acid(b) Oxalosuccinic acid(c) a - Ketoglutaric acid(d) Fumaric acidAnswer: (c)

2. Aerobic respiration which yields maximum ATP molecules is completed on (AMU 1990)(a) Mitochondria(b) General cytoplam(c) General cytoplasm and mitochondria(d) Somewhere elseAnswer: (a)

3. Anaerobe products of fermentation are (CBSE 1996)(a) Alcohol and lipoprotein(b) Ether and nucleic acid(c) Protein and nucleic acid(d) Alcohol, lactic acid and similar compoundsAnswer: (d)

4. Anaerobic process after glycolysis is called(AFMC 1997)(a) TCA (b) Calvin cycle(c) Krebs cycle (d) FermentationAnswer: (d)

5. Anaerobic respiration is also called(a) Fragmentation(b) Fermentation(c) Glycolysis(d) Krebs cycleAns: (b)

6. Anaerobic respiration is also known as (CPMT 1987)(a) Intramolecular respiration(b) Intermolecular respiration(c) Extramolecular respiration(d) Molecular respirationAnswer: (a)

7. Anaerobic respiration was first of all reported by(NCERT 1978; AFMC 1988)(a) Maguenne (b) Kostychev(c) Klein (d) PfefferAnswer: (b)

8. As compared to anaerobic respiration, the energy gained during aerobic respiration is(a) 8 times(b) 12 times

(c) 19 times(d) 36 timesAns: (c)

9. ATP – synthesis occurs on the(a) Outer membrane of mitochondrion(b) Inner membrane of mitochondrion(c) Matrix(d) None of the aboveAns: (b)

10. ATP is injected in cyanide poisoning because it is(a) Necessary for cellular functions(b) Necessary for Na+ - K+ pump(c) Na+ - K+ pump operates at the cell membranes(d) ATP breaks down cyanideAns: (a)

11. Both ATP and Mg2+ are involved in the activity of(a) Pyruvic Kinase(b) Hexokinase(c) Phosphogluco isomerase(d) PGA dehydrogenaseAns: (b)

12. Carbon dioxide acceptor in C3 plants in (CBSE 1999)(a) PEP (b) RuDP(c) PGA (d) None of theseAnswer: (b)

13. Carbon dioxide liberates during (CPMT 1996)(a) Ascent of sap (b) Transpiration(c) Photosynthesis (d) RespirationAnswer: (d)

14. Common immediate source of energy in cellular activity is(a) DNA(b) ATP(c) RNA(d) NADAns: (b)

15. Component of ETC of mitochondria is(a) Carotenoids(b) Plastocyanin(c) Phytochrome(d) Cytochrome oxidaseAns: (d)

16. Connecting link between glycolysis and Krebs cycle is /before entering Krebs cycle pyruvate is changed to(a) Oxaloacetate(b) PEP(c) Pyruvate(d) Acetyl CoAAns: (d)

17. Correct sequence in electron acceptors in ATP synthesis is / Decreasing energy level in ETS is(a) Cyt, a , a3, b, c(b) Cyt, b, c, a , a3(c) Cyt, c, b, a, a3(d) Cyt, b, c, a3, a

Ans: (b)

18. Cut surfaces of fruit and vegetables often become dark because (DPMT 1983; CPMT 1983)(a) Dirty knife makes it dark(b) Oxidation of tannic acid in the presence of trace of iron from the knife makes it dark(c) Dust of the air makes it dark(d) None o the aboveAnswer: (b)

19. Cytochrome helps in (AFMC 1994; MP PMT 1996)(a) Oxidation of glucose(b) Release of energy(c) Electron transport(d) GrowthAnswer: (c)

20. Cytochromes are(a) Electron acceptors(b) Protein acceptors(c) Oxygen acceptors(d) Passage – way for carbohydratesAns: (a)

 1.Discovery of photorespiration is based on(a) Warburg effect(b) Pasteur effect(c) Richmond-Lang effect (d) Cholodny-Went effectAnswer: (a)2.During 24 hours there is a time when plants neither give O2 nor CO2. this is the time of(BHU 1984, 91)(a) Night (b) Daylight(c) Twilight (d) None of theseAnswer: (c)3.During anaerobic respiration, decarboxylation reaction occurs in(a) Cytoplasm(b) Mitochondrial matrix(c) Cristae(d) F1 particlesAns: (a)4.During anaerobic respiration, one molecule of pyruvic acid(Rajasthan PMT 1985; BHU 1985; CPMT 1988)(a) Losses 3 molecules of ATP(b) Losses 6 molecules of ATP(c) Gains 2 molecules of ATP(d) Gains 4 molecules of ATPAnswer: (a)5.During respiration, pyruvic acid is formed by(CPMT 1986; BHU 1995)(a) Glycolysis (b) Krebs cycle(c) HMP pathway (d) None of the aboveAnswer: (a)6.

Electron carries if oxidative phosphorylation are present on(a) Outer membrane of mitochondria(b) Inner membrane of Mitochondria(c) Thylakoid membrane of chloroplast(d) Matrix of mitochondriaAns: (b)7.EMP can produce a total of(a) 6 ATP(b) 8 ATP(c) 24 ATP(d) 38 ATPAns: (b)8.End product of citric acid / Krebs cycle is(a) citric acid(b) lactic acid(c) pyruvic acid(d) CO2 + H2 OAns: (d)9.End product of glycolysis is(a) Acetyl CoA(b) Pyruvic Acid(c) Glucose 1 - phosphate(d) Fructose 1 - PhosphateAns: (b)10.End products of aerobic respiration are(a) Sugar and Oxygen(b) water and Energy(c) Carbon dioxide, water and energy(d) Carbon dioxide and energyAns: (c)11.Energy currency (reservoir) of the cells is(a) AMP(b) ATP(c) RNA(d) DNAAns: (b)12.Energy is released during(a) Citric acid  Isocitric acid(b) Isocitric acid  cis – Aconitic acid(c) Glucose 1- P  cis - Glucose 6-P (a) Pyruvate  Acetyl CoAAns: (d)13.Enzymes of oxydative phosphorylation found in(Rajasthan PMT 1995)(a) Endoplasmic reticulum(b) Chloroplast(c) Mitochondria(d) Golgi complexAnswer: (c)14.Enzymes taking part in glycolysis are present in(a) Mitochondria(b) Cytoplasm(c) Both Mitochondria and cytoplasm

(d) VacuoleAns: (b)15.ETC and TCA enzymes occur in(a) Ribosomes(b) Endoplasmic reticulum(c) Mitochondria(d) Cytoplasm and nucleusAns: (c)16.Evolution of CO2 is more than intake of oxygen when(MP PMT 1987; Delhi PMT 1990)(a) Socrose is respired(b) Glucose is respired(c) Organic acids are respired(d) Fats are respiredAnswer: (c)17.FAD is electron acceptor during oxidation of(a)  - Ketoglutarate  Succinyl acid(b) Succinic acid  Fumaric acid(c) Succinyl CoA  Succinic acid(d) Fumaric acid  Malic acidAns: (b)18.Fermentation produces(a) Protein and acetic acid(b) Alcohol and lipoprotein(c) Alcohol, lactic acid, etc.(d) Ethers and acetonesAns: (c)19.Fermentation products of yeast are(a) H2 O + CO2(b) Methyl alcohol + CO2(c) Methyl alcohol + water(d) Ethyl alcohol +CO2Ans: (d)20.Final electron acceptor in respiration is(a) Hydrogen(b) Oxygen(c) Cytochromes(d) DehydrogenasesAns: (b)

.For their functioning, cytochromes possess(a) Mg(b) Fe(c) Mn(d) NaAnswer: (b)2.Fructose 6 – phosphate is changed to fructose 1, 6-diphosphate by(a) Phosphoglycerate(b) Phosphatase(c) Phosphofructo - kinase(d) Enolase

Answer: (c)3.General formula for aerobic respiration is(a) 6CO2 + 6H2O C6H12O6 + 6O2

(b) C6H12O6 + 6O2  6CO2 + 6H2O + 686 kcal(c) C6H12O6  2C2H5OH + 2CO2 + 2ATP(d) C6H12O6  2C3H6O3 + 2ATPAnswer: (b)4.Glycolysis is(a) C6H12O6 + 6O2  6CO2 + 6H2O(b) C6H12O6 + 6O2  2C2H5OH + 2H2O(c) C6H12O6  2C3H4O3 + 4H(d) C3H4O3 +NADH  C2H5OH + CO2 + NAD+

Answer: (c)5.Glycolysis is part of(a) Only anaerobic respiration(b) Krebs cycle(c) Only aerobic respiration(d) Both aerobic and anaerobic respirationAnswer: (d)6.Heat energy of plants is measured in (MP PMT 1996)(a) Grams(b) Pounds(c) Decibels(d) CaloriesAnswer: (d)7.How may ATP will be produced during the production of 1 molecule of acetyl CoA from 1 molecule of pyruvic acid (MP PMT 1996)(a) 3 ATP(b) 5 ATP(c) 8 ATP(d) 38 ATPAnswer: (a)8.If carbon dioxide contents of the atmosphere is as high as 300 ppm (PM PMT 1989)(a) All plants will be killed(b) The plants would not grow properly(c) Plants would grow for some times and then die(d) The plant would thrive wellAnswer: (d)9.If the nacked pea seeds ae kept in four respiratory flasks, they would germinate best in the flask which contains (BHU 1982)(a) Carbon dioxide(b) Oxygen(c) Hydrogen(d) Nitrogen

Answer: (b)10.In aerobic respiration, pyruvic acid is(a) Broken down to form a two- carbon fragment and CO2

(b) A product of Krebs cycle(c) Formed when oxygen is available(d) Formed during protein breakdownAnswer: (a)11.In animal cells, the first stage of glucose breakdown is(a) Krebs cycle(b) Glycolysis(c) Oxidative phosphorylation(d) E.T.C.Answer: (b)12.In fermenation, yeast secrets one of the following enzyme (PM PMT 1989)(a) Invertase(b) Zymase(c) Dehydrogenase(d) AnolaseAnswer: (b)13.In glycolysis ultimately (or end product of glycolysis is)(a) Protein is converted into glucose(b) Glucose is converted into glycogen(c) Starch is converted into glucose(d) Glucose is converted into pyruvic acidAnswer: (d)14.In glycolysis, dehydration occurs during the formation of(a) 3-PGA(b) 2-PGA(c) PEPA(d) DHAPAnswer: (c)15.In glycolysis, glucose splits onto compounds which are(a) 5-C(b) 4-C(c) 2-C(d) 3-CAnswer: (d)16.In hexose monophosphate shunt, the number of CO2 molecules evolved is (AIIMS 1990)(a) Same as in glycolysis(b) Less than glycolysis(c) More than glycolysis(d) Much lesser than glycolysisAnswer: (c)17.

In how many steps, CO2 is released in aerobic respiration of pyruvic acid (MP PMT 1989)(a) One(b) Six(c) Three(d) TwelveAnswer: (c)18.In Krebs cycle, dehydration of substrate occurs(a) Once(b) Twice(c) Thrice(d) Four timesAnswer: (a)19.In mitochondria, ATP formation occurs(a) Over cristae(b) Over outer membrane(c) Inside matrix(d) In intracristal spaceAnswer: (a)20.In Opuntia, in night the R.Q. will be (CPMT 1986)(a) One(b) Less than one(c) More than one(d) ZeroAnswer: (d)1.In oxidative phosphorylation, oxidation and phosphorylation take place simultaneously and form (CBSE 1996)(a) NADP(b) DPN(c) Pyruvic acid (d) ATPAnswer: (d)2.In presence of cyanide, azide and carbon monoxide, the rate of respiration (MP PMT 1988)(a) Decreases (b) Increases(c) Remains the same(d) None of the aboveAnswer: (a)3.In the process of respiration in plants 180g of glucose plus 192 g of oxygen produce(a) 132 of CO2, 54 g of water and 343 Cal of energy(b) 264 of CO2, 108 g of water and 686 Cal of energy(c) 132 of CO2, 54 g of water and 343 Cal of energy(d) Large amount of CO2, no water and no energyAns: (b)4.Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as(a) TCA - pathway(b) Glycolysis(c) HMS-pathway

(d) Krebs cycleAns: (b)5.Instantaneous source of energy is(a) Glucose(b) Fats(c) Proteins(d) Amino acidsAns: (a)6.Kerbs cycle is also known as(NCERT 1975; EAMCET 1981; BHU 1978)(a) Glyoxylate cycle (b) EMP pathway(c) Citric acid cycle (d) Glycolate cycleAnswer: (c)7.Krebs cycle begins with (CBSE 1991)(a) Pyruvic acid (b) Hydrochloric acid(c) Corticosteroids (d) LysineAnswer: (a)8.Krebs cycle forms an important product(a) Acetyl CoA(b) ADP(c) ATP(d) WaterAns: (c)9.Krebs cycle is(a) Aerobic(b) Anaerobic(c) Anabolic(d) None of the aboveAns: (a)10.Krebs cycle is component of(a) Photosynthesis(b) Aerobic respiration(c) Anaerobic respiration(d) Photorespiration.Ans: (b)11.Krebs cycle is found in (AFMC 1996)(a) Anaerobic respiration(b) Photorespiration(c) Aerobic respiration(d) PhotosynthesisAnswer: (d)12.Lactic acid fermentation does not produce(a) ATP(b) CO2 and NADH(c) CO2

(d) NADHAns: (b)13.Lactic acid respiration /fermentation does not produce(a) CO2

(b) NADH2

(c) Both A and B(d) ATPAns: (c)14.Largest amount of phosphate bond energy is produced in the process of respiration during(a) Glycolysis(b) Krebs cycle(c) Anerobic respiration(d) None of the aboveAns: (b)15.Leaves of annual plants obtain O2 through(CPMT 1985; Delhi PMT 1977, 84)(a) Cell walls (b) Cuticle and leaf scars(c) Stomata (d) LenticelsAnswer: (c)16.Make suitable pairing (Rajasthan PMT 1997)(A) Glycolysis (a) Mitochondria(B) Krebs cycle (b) Cytoplamic matrix(C)  Electron transport chain(a) Aa, Bb, Cb (b) Ab, Ba, Ca(c) Aa, Bb, Cb (d) Ab, Bb, CaAnswer: (b)17.Metabolic water is the one that is(a) Used during photosynthesis(b) Produced during polymerisation(c) Produced during transamination(d) Formed during aerobic utilization of glucoseAns: (d)18.Mitochondria are absent in(a) Green algea(b) Brown algea(c) Red algea(d) Blue green algeaAns: (d)19.Mitochondria are store houses of(a) Glucose(b) ATP(c) Glycogen(d) FatsAns: (b)20.Most of the energy in the cells is liberated by oxidation of carbohydrates when(a) Pyruvic acid is converted into CO2 and H2O(b) Pyruvic acid is converted into acetyl CoA(c) Sugar is converted into pyruvic aicd(d) Glucose is converted into alcohol and CO2

Ans: (a)1.NAD of Krebs cycle functions as(a) Acceptor of hydrogen ion and electrons(b) Oxygen acceptor(c) Oxygen donor

(d) Donor of phosphate IonsAns: (a)2.NADH is produced in(a) Photosystem II(b) Photosystem I(c) Glycolysis(d) Both A and BAns: (c)3.Net gain of ATP molecules, during aerobic respiration is(CBSE 1999)(a) 36 molecules(b) 38 molecules(c) 40 molecules(d) 48 moleculesAnswer: (a)4.No carbon dioxide is given out by green plants during the day because they (AMU 1991)(a) Consume it in photosynthesis(b) Do not respire(c) Respire very slowly(d) Store the carbon dioxideAnswer: (a)5.Number of ATP Molecules which can be built on complete oxidation of pyruvic acid is(a) 6(b) 2(c) 15(d) 30Ans: (c)6.Number of carbon atoms available in acetyl CoA is(a) 6(b) 4(c) 3(d) 2Ans: (d)7.Out of 36 ATP molecules produced per glucose molecule during respiration(a) 2 are produced outside glycolysis and 34 during respiratory chain(b) 2 are produced outside Mitochondria and 34 inside Mitochondria(c) 2 during glycolysis and 34 during Krebs cycle(d) All are formed inside mirochondriaAns: (b)8.Out of 38 ATP molecules produced per glucose, 34 ATP molecules are formed from NADH/FADH2 in(a) Respiratory chain(b) Krebs cycle(c) Oxidative decarboxylation(d) EMPAns: (a)9.Oxidation of pyruvate to CO2 and H2O occurs through(a) citric acid cycle(b) Tricarboxylic cycle(c) Krebs cycle(d) All the aboveAns: (d)10.Oxidative phosphorylation is production of(a) ATP in photosynthesis

(b) NADH in photosynthesis(c) ATP in respiration(d) NADH in respirationAns: (c)11.Oxidative phosphorylation is the formation of(CBSE 1992; BHU 1994)(a) NADPH2 in respiration(b) ATP in respiration(c) NADPH2 in photosynthesis(d) ATP in photosynthesisAnswer: (b)12.Oxidative phosphorylation occurs in(Delhi PMT 1985; CPMT 1983; CET Pune 1998)(a) Outer membrane of mitochondria(b) Inner membrane of mitochondira(c) Stroma of chloroplast(d) Grana of chloroplastAnswer: (b)13.Photorespiration is favoured by (CBSE 1991)(a) Low light and high O2(b) Low O2 nad high CO2(c) Low temperature and high O2(d) High O2 and low CO2Answer: (d)14.Photorespiration takes place only in (MP PMT 1997)(a) Green parts of the plant(b) All the living cells of the plant(c) Mitochondria(d) RoofAnswer: (a)15.Plants whose requirement for respiration is similar to animals are(a) Algae (b) Fungi(c) Lichens(d) CyanobacteriaAnswer: (b)16.Product of glycolysis is(a) Citric acid(b) dihydroxy(c) pyruvic acid(d) Phosphoenol pyruvateAns: (c)17.Pyruvate (pyruvic acid) dehydrogenase is used in conveting (BHU 1986)(a) Pyruvate to glucose(b) Glucose to pyruvate(c) Pyuvic acid to lactic acid(d) Pyruvate (pyruvic acid) to acetyl CoA.Answer: (d)18.Pyruvic acid is formed at the end of(a) Calvin cycle(b) Glycolysis(c) Krebs cycle(d) Pentose phosphate pathwayAns: (b)

19.Pyruvic dehydrogenase is used in converitng(a) Pyruvic acid to acetyl co-enzyme A(b) Pyruvate to glucose(c) glucose to Pyruvate(d) Pyruvic acid to lactic acidAns: (a)20.R.Q. of maleic acid is (Rajasthan PMT 1995)(a) 0.7 (b) 1(c) 1.33 (d) 4Answer: (c)1.The energy yield as a result of total oxidation of one molecule of glucose during cellular respiration is sufficient to convert (Karnataka CET 1998)(a) 30 molecules of ADP to 30 molecules of ATP(b) 32 molecules of ADP to 32 molecules of ATP(c) 36 molecules of ADP to 36 molecules of ATP(d) 38 molecules of ADP to 38 molecules of ATPAnswer: (c)2.The enzyme which converts glucose to glucose 6-phosphate is(a) Phosphorylase(b) Glucose- 6- phosphatase(c) Hexokinase(d) Glucose synthetaseAnswer: (c)3.The enzymes which take part in glycolysis are found in(PM PMT 1996)(a) Mitochondria(b) Cytoplasm(c) Mitochondria and cytoplasm(d) VacuolesAnswer: (b)4.The formation of acetyl coenzyme-A from pyruvic acid is the result of its (CPMT 1990)(a) Reduction(b) Dehydration(c) Dephosphorylation(d) Oxidative decarboxylationAnswer: (d)5.The glycolate metabolism occurs in (MP PMT 1995)(a) Lysosomes (b) Ribosomes(c) Glyoxysomes(d) PeroxisomesAnswer: (d)6.The importance Krebs cycle is in the production of(MP PMT 1996)(a) Acetyl CoA (b) Water(c) ATP (d) ADPAnswer: (c)7.The last of terminal cytochrome in respiratory chain is(CBSE 1992; Rajasthan PMT 1997)

(a) Cyt b (b) Cyt a3(c) Cyt a1 (d) Cyt cAnswer: (b)8.The maximum potential difference between the electron carries required for ATP synthesis is(a) 0.05 ev(b) 0.15 ev(c) 0.27 ev(d) 0.45 evAnswer: (c)9.The membrane bound enzyme involved in Krebs cycle is(AIIMS 1994)(a) Malate dehydrogenase(b) Fumarase(c) Cis acotinase(d) Succinic dehydgenaseAnswer: (d)10.The net gain of energy from one gram mole of glucose during aerobic respiration is(a) 2 ATP(b) 4 ATP(c) 38 ATP(d) 40 ATPAnswer: (c)11.The number of molecules of pyruvic acid formed from one molecule of glucose at the end of glycolysis is(a) 1(b) 2(c) 3(d) 4Answer: (b)12.The plants similar to animals in their requirement of oxygen for cellular respiration belong to(a) Red algae (b) Blue-green algae(c) Fungi (d) LichensAnswer: (c)13.The pyruvic acid formed in Glycolysis is oxidised to CO2 and H2O in a cycle called (MP PMT 1999)(a) Calvin cycle(b) Hill reaction(c) Krebs (d) Nitrogen cycleAnswer: (c)14.The R.Q. (Respiratory quotient) of C39 H72 O6 is(CPMT 1992)(a) 2.71 (b) 1.32(c) 0.72 (d) 3.250Answer: (c)15.The rate of respiration of young maturing seeds is quite high but as water content decreases during further maturation, respiration (Delhi PMT 1986)(a) Remains high (b) Stops completely(c) Increases steadily 

(d) Decreases steadilyAnswer: (d)16.The reactions of Krebs cycle take place(a) In the cytoplasm(b) In ER(c) In matrix of mitochondria(d) On the surface of mitochondriaAnswer: (d)17.The tissue of highest respiratory activity is(a) Meristems(b) Ground tissue(c) Phloem(d) Mechanical tissueAnswer: (a)18.What is produced when succinyl CoA is changed to succinate?(a) ATP(b) GTP(c) CTP(d) ATP in plants and GTP in animalsAnswer: (d)19.What is the other name of glycolysis.(PM PMT 1986; CET Pune 1998; CPMT 1998)(a) EMP pathway (b) TCA pathway(c) HMS pathway (d) None of the aboveAnswer: (a)20.When a molecule of pyruvic acid is subjected to anaerobic oxidation and forms lactic acid, there is(a) Loss of 3 ATP , molecules(b) Loss of 6 ATP , molecules(c) Gain of 2 ATP , molecules(d) Gain of 4 ATP , moleculesAnswer: (a)

1.Raw material of respiration id(a) Glucose and CO2

(b) Glucose and O2

(c) Glucose and fructose(d) Glucose and suroseAnswer: (b)2.Respiration differs from the process of combustion in the fact that(a) All the energy stored in glucose in released at once due to combustion(b) All energy stored in glucose is gradually released due to combustion(c) Comparatively large quantity of nergy is produced due to combustion(d) The carbohydrates act as the combustion substanceAnswer: (b)3.Respiration is(a) Anabolic process

(b) Physical process(c) Catabolic process(d) Biophysical processAnswer: (c)4.Respiration is(a) Catabolic process that uses carbon dioxide, produces oxygen and converts released energy to ATP(b) Anabolic process that uses oxygen and carbon dioxide to from ATP(c) Anabolic process that uses oxygen, produces carbon dioxide and converts released energy into ATP(d) Catabolic process that uses oxygen, produces carbon dioxide and converts released energy into ATPAnswer: (d)5.Respiration is a process in which (CPMT 1983)(a) Energy is used up(b) Energy is tored in the form of ATP(c) Energy is released and stored in the form of ATP(d) Energy is not released at allAnswer: (c)6.Respiration is an (CPMT 1986)(a) Endothermic process(b) Exothermic process(c) Anabolic process(d) Endegonic processAnswer: (b)7.Respiratory enzymes are located in (Delhi PMT 1986)(a) Mitochondrial matrix (mitochondria)(b) Perimitochondiral space(c) Cristae(d) Outer membraneAnswer: (a)8.Sequence in Krebs cycle is(a) - Ketoglutaric acid Isocitric acid Oxalosuccinic acid(b) Isocitric acid Oxalosuccinic acid - Ketoglutaric acid(c) Isocitric acid - Ketoglutaric acid Oxalosuccinic acid(d) Oxalosuccinic acid Isocitric acid - Ketoglutaric acidAnswer: (b)9.Site of glycolysis or EMP is

(a) Mitochondria(b) Cytoplasma(c) E.R.(d) RibosomesAnswer: (b)10.Slow respiring plants or plant tissues are(a) Promeristems(b) Cambium(c) Leaf primordia and young plant(d) Adult plants and matured tissuesAnswer: (d)11.Substrate phosphorylation occurs during(a) Fumaric acid Malic acid(b) Oxalosuccinic acid - ketoglu- taric acid(c) Succinic acid Fumaric acid(d) - ketoglu- taric acid Succinic acidAnswer: (d)12.Terminal ccytochrome of respiratory chain which donates electrons to oxygen is(a) Cyt. b(b) Cyt. c(c) Cyt. a1

(d) Cyt. a3

Answer: (d)13.The amount of energy given by one mole of ATP is(a) 7.3 kcal(b) 721 kcal(c) 7600 kcal(d) 1000 kcalAnswer: (a)14.The amount of energy released in complete oxidation of one molecule of glucose is (Rajasthan PMT 1997)(a) 628 kcal(b) 668 kcal(c) 686 kcal(d) 697 kcalAnswer: (c)15.The ATP molecules produced by glycolysis and acetylation in aerobic respiration including ETS are respectively

(a) 8 and 6(b) 6 and 8(c) 2 and 8(d) 8 and 2Answer: (a)16.The cell organelle associated with photorespiration is(MP PMT 1996)(a) Glyoxysome(b) Lysosome(c) Mesosome(d) RibosomeAnswer: (c)17.The correct sequence of electron acceptor in ATP synthesis is (CBSE 1997)(a) Cyt a,a,b,c(b) Cyt b,c,a,a3(c) Cyt b,a3,a(d) Cyt c,b,a,a3Answer: (b)18.The cycle in which pyruvic acid is broken down in presence of oxygen is known as (MP PMT 1988)(a) Glycolysis(b) Krebs cycle(c) Anaerobic respiration(d) None of the aboveAnswer: (b)19.The end product of fermentation are (CBSE 1997)(a) CO2 and O2

(b) CO2 and C2H5 OH(c) O2 and C2H5 OH(d) CO2 and acetaldehydeAnswer: (b)20.The end products of respiration in plant are(AFMC 1976; CPMT 1972)(a) CO2, H2O and energy(b) Starch and O2

(c) Sugar and O2

(d) H2O and energyAnswer: (a)