Respiration in plants MCQs with Answers

Question-1. A mutant cell lacking mitochondria will show

1. Inability to oxidize carbohydrates
2. Inability to oxidize carbohydrates and fats
3. Inability to synthesize glucose
4. Inability to oxidize fats

Question-2. Amino acids are mostly synthesized from

1. a-ketoglutaric acid
2. mineral salts
3. fatty acids
4. volatile acids

Question-3. Apparatus to measure rate of respiration and RQ is

1. manometer
2. auxanometer
3. potometer
4. respirometer

Question-4. At a temperature above 35°C

1. both decline simultaneously
2. rate of photosynthesis will decline earlier than that of respiration
3. rate of respiration will decline earlier than that of photosynthesis
4. there is no fixed pattern

Question-5. ATP is injected in cyanide poisoning because it is

1. ATP breaks down cyanide
2. necessary for cellular functions
3. necessary for Na+ –K+ pump
4. Na+–K+ pump operates at the cell membranes

Question-6. Chemiosmotic theory of ATP synthesis in the chloroplast and mitochondria is based on

1. proton gradient
2. membrane potential
3. accumulation of Na+ions
4. accumulation of K+ ions

Question-7. Common enzyme in glycolysis and pentose phosphate pathways is

1. dehydrogenase
2. hexokinase
3. fumarase
4. aconitase

Question-8. Connecting link between glycolysis and Krebs cycle is (before entering Krebs cycle pyruvate changed to)

1. acetyl Co-A
2. oxaloacetate
3. PEP
4. pyruvate

Question-9. During the early stages of alcoholic fermentation there is a high rate of growth of yeast. After some time the rate decreases. Which of the following conditions in the culture medium is least likely to have caused this?

1. Depletion of glucose
2. Depletion of oxygen
3. Depletion of mineral salts
4. Accumulation of waste products

Question-10. During which stage, in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP

1. electron transport chaind) electron transport chain
2. glycolysis
3. Krebs cycle
4. conversion of pyruvic acid to acetyl Co-A

Question-11. EMP can produce a total of

1. 38 ATP
2. 6 ATP
3. 8 ATP
4. 24 ATP

Question-12. End product of citric acid/Krebs cycle is

1. CO2 + H2O
2. citric acid
3. lactic acid
4. pyruvic acid

Question-13. End product of glycolysis is

1. fructose 1-phosphate
2. acetyl Co-A
3. pyruvic acid
4. glucose 1-phosphate

Question-14. End products of aerobic respiration are

1. carbon dioxide and energy
2. sugar and oxygen
3. water and energy
4. carbon dioxide, water and energy

Question-15. Fermentation is anaerobic production of

1. alcohol and lipoproteins
2. protein and acetic acid
3. alcohol, lactic acid or similar compounds
4. ethers and acetones

Question-16. Fermentation products of yeast are

1. ethyl alcohol + CO2
2. H2O + CO2
3. methyl alcohol + CO2
4. methyl alcohol + H2O

Question-17. Hexose monophosphate shunt does not take place when

1. Oxygen is not enough
2. NAD is available
3. NAD is not available due to shortage of oxygen
4. Glucose is the substrate

Question-18. How many ATP molecules are produced by aerobic oxidation of one molecule of glucose?

1. 34
2. 2
3. 4
4. 38

Question-19. In alcoholic fermentation

1. there is no electron donor
2. oxygen is the electron acceptor
3. triose phosphate is the electron donor while acetaldehyde is the electron acceptor
4. triose phosphate is the electron donor while pyruvic acid is the electron acceptor

Question-20. In animal cells, the first stage of glucose break down is

1. ETC
2. Krebs cycle
3. glycolysis
4. oxidative phosphorylation

Question-21. In glycolysis, during oxidation electrons are removed by

1. molecular oxygen
2. ATP
3. glyceraldehyde-3-phosphate
4. NAD+

Question-22. In Kreb’s cycle, the FAD participates as electron acceptor during the conversion of

1. None of these
2. succinic acid to fumaric acid
3. fumaric acid to malic acid
4. succinyl CoA to succinic acid

Question-23. In Krebs cycle FAD participates as electron acceptor during the conversion of

1. fumaric acid to malic acid
2. succinyl Co-A to succinic acid
3. a-ketoglutarate to succinyl Co-A
4. succinic acid to fumaric acid

Question-24. In which one of the following do the two names refer to one and the same thing?

1. Citric acid cycle and Calvin cycle
2. Tricarboxylic acid cycle and urea cycle
3. Krebs cycle and Calvin cycle
4. Tricarboxylic acid cycle and citric acid cycle

Question-25. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as

1. HMS-pathway
2. Glycolysis
3. Krebs cycle
4. TCA-pathway

Question-26. Krebs cycle occurs in

1. ribosomes
2. mitochondria
3. cytoplasm
4. chloroplast

Question-27. Life without air would be

1. anaerobic
2. reductional
3. free from oxidative damage
4. impossible

Question-28. Link between glycolysis, Krebs cycle and poxidation of fatty acid or carbohydrate and fat metabolism is

1. acetyl Co-A
2. oxaloacetic acid
3. succinic acid
4. citric acid

Question-29. Net gain of ATP molecules during aerobic respiration is

1. 48 molecules
2. 36 molecules
3. 38 molecules
4. 40 molecules

Question-30. One of the following is common to glycolysis as well as Krebs cycle in eukaryotes

1. None of these
2. Substrate level phosphorylation
3. Photophosphorylation
4. Localization in mitochondria

Question-31. Out of 36 ATP molecules produced per glucose molecule during respiration

1. all are formed inside mitochondria
2. 2 are produced outside glycolysis and 34 during respiratory chain
3. 2 are produced outside mitochondria and 34 inside mitochondria
4. 2 during glycolysis and 34 during Krebs cycle

Question-32. Out of 38 ATP molecules produced per glucose,32 ATP molecules are formed from NADH/FADH2 in

1. EMP
2. respiratory chain
3. Krebs cycle
4. oxidative decarboxylation

Question-33. Oxidative phosphorylation involves simultaneous oxidation and phosphorylation to finally form

1. ATP
2. pyruvate
3. NADP
4. DPN

Question-34. Oxidative phosphorylation is production of

1. NADH in respiration
2. ATP in photosynthesis
3. NADPH in photosynthesis
4. ATP in respiration

Question-35. Quantasomes are found in

1. None of these
2. chloroplast
3. mitochondria
4. lysosome

Question-36. Respiratory quotient (RQ) for fatty acid is

1. > 1
2. < 1
3. 1

Question-37. Respiratory substrate yielding maximum number of ATP molecule is

1. glycogen
2. ketogenic amino acids
3. glucose
4. amylose

Question-38. Site of respiration in bacteria is

1. microsome
2. mesosome
3. episome
4. ribosome

Question-39. Terminal cytochrome of respiratory chain which donates electrons to oxygen is

1. cyt.-a3
2. cyt. b
3. cyt. c
4. cyt. a1

Question-40. The energy-releasing process in which the substrate is oxidised without an external electron acceptor is called

1. aerobic respiration
2. glycolysis
3. photorespiration
4. fermentation

Question-41. The major reason that glycolysis is not as energy productive as respiration is that

1. None of these
2. pyruvate is more reduced than CO2; it still contains much of the energy from glucose
3. it does not take place in a specialized membrane-bound organelle.
4. it is the pathway common to fermentation and respiration

Question-42. The mechanism of ATP formation both in chloroplast and mitochondria is explained by

1. Cholondy-Went’s model
2. relay pump theory of Godlewski
3. Munch’s pressure/mass flow model
4. chemiosmotic theory of Mitchell

Question-43. The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of

1. nucleic acids
2. ATP in small stepwise units
3. ATP in one large oxidation reaction
4. sugars

Question-44. What is the end product of glycolysis of a glucose molecule

1. Fructose 1, 6- diphosphate
2. Pyruvate and ATP
3. Phosphoglyceraldehyde
4. Lactic acid and ATP

Question-45. When one glucose molecule is completely oxidised, it changes

1. 32 ADP molecules into 32 ATP molecules
2. 36 ADP molecules into 36 ATP molecules
3. 38 ADP molecules into 38 ATP molecules
4. 30 ADP molecules into 30 ATP molecules

Question-46. Which of the following is a 4-carbon compound?

1. Phosphoenol pyruvate
2. Oxaloacetic acid
3. Phosphoglyceric acid
4. Citric acid

Question-47. Which of the following is a biological uncoupler of oxidative phosphorylation ?

1. Ethylene diaminotetra acetic acid
2. Thermogenin
3. 2, 4 – Dichlorophenoxy acetic acid
4. 2, 4 – Dinitrophenol

Question-48. Which of the following is an important intermediate found in all the types of respiration ?

1. Oxaloacetate
2. Pyruvic acid
3. Tricarboxylic acid
4. Acetyl CoA

Question-49. Which of the following is essential for conversion of pyruvic acid into acetyl Co-A?

1. All of these
2. LAA
3. NAD+
4. TPP

Question-50. Which of the following is not true for oxidative phosphorylation?

1. It depends on chemiosmosis
2. It uses oxygen as the initial electron donor.
3. It involves the redox reactions of electron transport chain
4. It involves an ATP synthase located in the inner mitochondrial membrane.

Question-51. Which of the following processes make direct use of oxygen ?

1. None of these
2. Electron transport
3. Fermentation
4. citric acid cycle

Question-52. A characteristic of drupe is

1. stony endocarp
2. fleshy seed coat
3. stony pericarp
4. stony mesocarp

Question-53. Aleurone layer takes part in

1. transfer of food from cotyledons to embryo tips
2. protection of delicate embryo
3. enzyme synthesis
4. transfer of food to cotyledons

Question-54. Angiosperm pollen is generally released at the

1. male gamete formation stage
2. 1 – celled stage
3. 2 – celled stage
4. 3 – celled stage

Question-55. End product of glycolysis is

1. OAA
2. acetyl Coenzyme A
3. PEP
4. pyruvate

Question-56. Herkogamy is a contrivance for

1. cleistogamy
2. allogamy
3. autogamy
4. chasmogamy

Question-57. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is know as

1. Glycolysis
2. TCA pathway
3. Glycolysis
4. Hms pathway

Question-58. Malacophily means

1. pollination by snails
2. pollination by wind
3. pollination by water
4. pollination by insects

Question-59. One molecule of glucose yields ___ ATP molecules in aerobic respiration.

1. 42
2. 2
3. 16
4. 38

Question-60. Out of 36 ATP molecules produced per glucose molecule during respiration

1. 2 during glycolysis and 34 during kreds cycle
2. 2 are produced outside glycolysis and 34 during repiratory chain
3. 2 are produced outside mitochondria and 34 inside the mitochondria
4. all the formed inside mitochondria

Question-61. R.Q is ratio of

1. oxygen consumed to water produced
2. CO2 produced to substarate consumed
3. CO2 produced to O2 consumed
4. oxygen consumed to CO2 produced

Question-62. Respiratory enzymes are located in

1. outer membrane
2. mitochondrial matrix
3. Cristae
4. perimitochondrial space

Question-63. Respiratory quotient of carbohydrates is

1. 0.9
2. 1.2
3. 1

Question-64. TCA cycle was discovered by

1. All of these
2. Otto Meyerhof
3. Hans Kreb
4. Gustav Embden

Question-65. The complete oxidation of pyruvate take place in

1. nucleus
2. cell cytoplasm
3. inner mitochondrial membrane
4. mitochondrial matrix

Question-66. The final electron acceptor in electron transport chain is

1. oxygen
2. Cytochrome C
3. FADH
4. NADH

Question-67. The significant morphological feature of passion flower is the presence of

1. androgynophore
2. numerous corolla
3. androphore
4. gynophore

Question-68. Which of the following acts as mobile carrier for transfer of electrons between complex III and complex IV?

1. FADH2
2. Cytochrome c
3. cytochrome a3
4. cytochrome a

Question-69. Which one of the following describes the spikelet of a cereal or grass plant

1. fused calyx
2. inferior ovary
3. dehiscent fruit
4. pair of glumes