Respiration in plants MCQs with Answers

Question-1. A mutant cell lacking mitochondria will show

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

Question-2. Amino acids are mostly synthesized from

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

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

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

Question-4. At a temperature above 35°C

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

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

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

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

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

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

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

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

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

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

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

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

Question-11. EMP can produce a total of

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

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

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

Question-13. End product of glycolysis is

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

Question-14. End products of aerobic respiration are

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

Question-15. Fermentation is anaerobic production of

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

Question-16. Fermentation products of yeast are

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

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

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

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

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

Question-19. In alcoholic fermentation

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

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

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

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

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

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

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

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

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

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

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

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

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

Question-26. Krebs cycle occurs in

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

Question-27. Life without air would be

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

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

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

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

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

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

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

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

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

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

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

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

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

Question-34. Oxidative phosphorylation is production of

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

Question-35. Quantasomes are found in

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

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

Question-38. Site of respiration in bacteria is

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Question-52. A characteristic of drupe is

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

Question-53. Aleurone layer takes part in

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

Question-54. Angiosperm pollen is generally released at the

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

Question-55. End product of glycolysis is

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

Question-56. Herkogamy is a contrivance for

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

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

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

Question-58. Malacophily means

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

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

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

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

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

Question-61. R.Q is ratio of

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

Question-62. Respiratory enzymes are located in

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

Question-63. Respiratory quotient of carbohydrates is

1. 0.9
2. 1.2
3. 1

Question-64. TCA cycle was discovered by

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

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

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

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

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

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

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

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

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

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

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