NEET Biology Respiration In Plants MCQs Set B

Question: Mineral activator needed for the enzyme isocitrate dehydrogenase of TCA cycle is

• a) Mn
• b) Cu
• c) Mg
• d) Fe

Answer: Mn

Question: Fumarase enzyme converts

• a) Fumaric acid to malic acid
• b) Succinic acid to malic acid
• c) Succinic acid to fumaric acid
• d) Fumaric acid to citric acid

Answer: Fumaric acid to malic acid

Question: Substrate level phosphorylation does not occur in which of the following reaction of aerobic respiration?

• a)

  

• b)

  

• c) PEP Pyruvate
• d) None of these

Answer:

Question: A Krebs cycle intermediate as raw material for chlorophyll production is synthesised after

• a) Oxidative decarboxylation
• b) Substrate level phosphorylation
• c) Condensation
• d) Hydration

Answer: Oxidative decarboxylation

Question: Select the correct statement w.r.t. Krebs cycle

• a) Intermediate products contain four, five and six carbon atoms
• b) Favoured by coenzyme NADP⁺
• c) Substrate molecule is a 3C compound
• d) None of these

Answer: Intermediate products contain four, five and six carbon atoms

Question: Connecting link between respiration (TCA cycle) and protein synthesis is

• a)

  

• b) Succinic acid
• c) Fumaric acid
• d) Citric acid

Answer:

Question: The correct sequence in Krebs cycle is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) 3, 2
• b) 2, 3
• c) 3, 5
• d) 5, 3

Answer: 3, 2

Question: The complex concerned with oxidative phosphorylation in inner mitochondrial membrane is

• a) Complex V
• b) Complex III
• c) Complex II
• d) Complex IV

Answer: Complex V

Question: Mobile electrons carriers in ETS in mitochondrial membrane are

• a) CoQ, Cyt c
• b) PQ, Cyt c
• c) PC, CoQ
• d) PQ, PC

Answer: CoQ, Cyt c

Question: Total number of ATP produced through ETS only from one molecule of 3-phosphoglycerate in aerobic respiration is

• a) 14
• b) 12
• c) 15
• d) 16

Answer: 14

Question: Slow oxidation of NADH occurs in

• a) Fermentation
• b) Aerobic respiration
• c) PPP
• d) Dicarboxylic acid cycle

Answer: Fermentation

Question: Which one of the following is incorrect statement for mitochondrial ETC and oxidative phosphorylation?

• a)

  

• b)

  

• c)

  

• d) Cytochrome-c is a mobile protein attached to outer surface of inner membrane

Answer:

Question:

• a) Reducing agent
• b) Carboxylating agent
• c) Phosphorylating agent
• d) Oxidising agent

Answer: Reducing agent

Question: A false statement regarding cytochrome c-oxidase complex in ETS in mitochondria is

• a) Receives electrons directly from ubiquinone
• b) Extend across the thickness of inner mitochondrial membrane
• c) Contains Fe & Cu both
• d) None of these

Answer: Receives electrons directly from ubiquinone

Question: In prokaryotic cells, number of ATP generated from one glucose molecule is

• a) 38
• b) 34
• c) 32
• d) 36

Answer: 38

Question: The efficiency of respiration is approximately

• a) 45%
• b) 50%
• c) 90%
• d) 30%

Answer: 45%

Question: Mark the incorrect statement.

• a) Incomplete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO₂
• b) Initial stage of cellular respiration takes place in cytoplasm
• c) Breaking of C – C bonds of complex organic molecules by oxidation cells leading to the release of a lot of energy is called cellular respiration
• d) TCA cycle starts with the condensation of acetyl group with OAA and H₂O to yield citric acid

Answer: Incomplete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO₂

Question: Transfer of yeast cells from anaerobic to aerobic condition will

• a) More than one option is correct
• b) Decrease sugar breakdown
• c)

  

• d)

  

Answer: More than one option is correct

Question: Inhibition of sugar breakdown due to the presence of O2 under anaerobic condition is called

• a) Pasteur effect
• b) Warburg effect
• c) Crabtree effect
• d) Kutusky effect

Answer: Pasteur effect

Question: Common molecule formed from all food stuffs during aerobic respiration is

• a) Acetyl CoA
• b) PGAL
• c) Glucose
• d) Pyruvic acid

Answer: Acetyl CoA

Question: From the oxidation of one molecule of palmitic acid (fatty acid), the number of ATP molecules gained as net are

• a) 129
• b) 131
• c) 38
• d) 142

Answer: 129

Question: The value of RQ when the respiratory substances are poor in oxygen is

• a) Less than one
• b) Infinity
• c) Zero
• d) Greater than one

Answer: Less than one

Question: Location of SDH enzyme of Krebs cycle in plants is

• a) Inner mitochondrial membrane
• b) Matrix
• c) Plasma membrane
• d) Cytoplasm

Answer: Inner mitochondrial membrane

Question:

• a) (d), (c), (b) & (a)
• b) (b), (c), (a) & (d)
• c) (c), (b), (a) & (d)
• d) (c), (b), (d) & (a)

Answer: (d), (c), (b) & (a)

Question: Cytochromes are found in

• a) Cristae of mitochondria
• b) Matrix of mitochondria
• c) Lysosomes
• d) Outer wall of mitochondria

Answer: Cristae of mitochondria

Question: In which one of the following processes CO₂ is not released?

• a) Lactate fermentation
• b) Aerobic respiration in animals
• c) Aerobic respiration in plants
• d) Alcoholic fermentation

Answer: Lactate fermentation

Question: Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

• a) Acetyl CoA
• b) Fructose 1,6-bisphosphate
• c) Pyruvic acid
• d) Glucose-6-phosphate

Answer: Acetyl CoA

Question:

Arrows numbered 4,8 and 12 can all be

• a) ATP
• b) NADH
• c)

  

• d) H₂O

Answer: ATP

Question: Read the following four statements (A-D)

(A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane
(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth
(C) Stamens in flowers of Gloriosa and Petunia are polyandrous
(D) Symbiotic nitrogen-fixers occur in free-living state also in soil

• a) Two
• b) Three
• c) Four
• d) One

Answer: Two

Question: The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

• a) Glycolysis
• b) Fermentation
• c) Aerobic respiration
• d) Photorespiration

Answer: Glycolysis

Question: Aerobic respiratory pathway is appropriately termed:

• a) Amphibolic
• b) Anabolic
• c) Catabolic
• d) Parabolic

Answer: Amphibolic

Question: A competitive inhibitor of succinic dehydrogenase is

• a) Malonate
• b) Oxaloacetate
• c) Malate
• d) ketoglutarate

Answer: Malonate

Question: The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

• a) A proton gradient forms across the inner membrane
• b) ADP is pumped out of the matrix into the intermembrane space
• c) High energy bonds are formed in mitochondrial proteins
• d) There is a change in the permeability of the inner mitochondiral membrane toward adenosine diphosphate(ADP)

Answer: A proton gradient forms across the inner membrane

Question: The overall goal of glycolysis, Krebs 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: ATP in small stepwise units

Question: All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:

• a) Succinate dehydrogenase
• b) Isocitrate dehydrogenase
• c) Lactate dehydrogenase
• d) Malate dehydrogenase

Answer: Succinate dehydrogenase

Question: How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO₂and H₂O yields 686 kcal and the useful chemical energy available inthe high energy phosphate bond of one mole of ATP is 12 kcal ?

• a) Fifty seven
• b) One
• c) Thirty
• d) Two

Answer: Fifty seven

Question: During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

• a) Electron transport chain
• b) Krebs cycle
• c) Conversion of pyruvic acid to acetyl Co-A
• d) Glycolysis

Answer: Electron transport chain

Question: Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

• a) Proton gradient
• b) Accumulation of Na ions
• c) Accumulation of K ions
• d) Membrane potential

Answer: Proton gradient

Question: Glycolysis

• a) Reduces two molecules of NAD⁺ for every glucose molecule processed
• b) Has no connection with electron transport chain
• c) Produces no ATP
• d) Takes place in the mitochondria

Answer: Reduces two molecules of NAD⁺ for every glucose molecule processed

Question: The first phase in the breakdown of glucose, in animal cell, is

• a) Glycolysis
• b) E.T.S.
• c) Krebs cycle
• d) Fermentation

Answer: Glycolysis

Question: At the end of glycolysis, six carbon compound ultimately changes into

• a) Pyruvic acid
• b) ATP
• c) Acetyl Co-A
• d) Ethyl alcohol

Answer: Pyruvic acid

Question: In glycolysis, during oxidation electrons are removed by

• a) NAD⁺
• b) ATP
• c) Glyceraldehyde-3-phosphate
• d) Molecular oxygen

Answer: NAD⁺

Question: The organism used for alcohol fermentation, is

• a) Saccharomyces
• b) Pseudomonas
• c) Penicillium
• d) Aspergillus

Answer: Saccharomyces

Question: Which of the following products are obtained by anaerobic respiration from yeast?

• a) All of these
• b) Alcohols
• c) Beer and wine
• d) CO₂

Answer: All of these

Question: The end products of fermentation are

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: During the formation of bread, it becomes porous due to release of CO₂ by the action of

• a) Yeast
• b) Bacteria
• c) Virus
• d) Protozoans

Answer: Yeast

Question: In alcohol fermentation

• a) Triose phosphate is the electron donor while acetaldehyde is the electron acceptor
• b) There is no electron donor
• c) Triose phosphate is the electron donor while pyruvic acid is the electron acceptor
• d) Oxygen is the electron acceptor

Answer: Triose phosphate is the electron donor while acetaldehyde is the electron acceptor

Question: Dough kept overnight in warm weather becomes soft and spongy because of

• a) Fermentation
• b) Absorption of carbon dioxide from atmosphere
• c) Cohesion
• d) Osmosis

Answer: Fermentation

Question: In Krebs cycle, the FAD precipitates as electron acceptor during the conversion of

• a) Succinic acid to fumaric acid
• b) Fumaric acid to malic acid
• c) Succinyl CoA to succinic acid
• d) ketoglutarate to succinyl CoA

Answer: Succinic acid to fumaric acid

Question: Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?

• a) Acetyl CoA
• b) NADH
• c) ATP
• d) Malic acid

Answer: Acetyl CoA

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

• a) Tricarboxylic acid cycle and citric acid cycle
• b) Tricarboxylic acid cycle and citric acid cycle
• c) Krebs cycle and Calvin cycle
• d) Citric acid cycle and Calvin cycle

Answer: Tricarboxylic acid cycle and citric acid cycle

Question: In mitochondria, protons accumulate in the

• a) Intermembrane space
• b) Outer membrane
• c) Matrix
• d) Inner membrane

Answer: Intermembrane space

Question: The ultimate respiratory substrate, yielding maximum number of ATP molecules, is

• a) Glucose
• b) Glycogen
• c) Ketogenic amino acid
• d) Amylose

Answer: Glucose

Question: When one molecule of ATP is disintegrated, the amount of energy liberated is

• a) 8.15 kcal
• b) 4.5 kcal
• c) 38 kcal
• d) 1.8 kcal

Answer: 8.15 kcal

Question: The correct sequence of electron acceptor in ATP synthesis is

• a) Cyt. b, c, a, a₃
• b) Cyt. a₃, a, b, c
• c) Both
• d) None of these

Answer: Cyt. b, c, a, a₃

Question: The mechanism of ATP formation both in chloroplast and mitochondria is explained by

• a) Chemiosmotic theory
• b) Relay pump theory of Godlewski
• c) Munch’s hypothesis (mass flow model)
• d) Cholodny-Went’s model

Answer: Chemiosmotic theory

Question: Net gain of ATP molecules, during aerobic respiration, in heart cells is

• a) 38 molecules
• b) 48 molecules
• c) 40 molecules
• d) 36 molecules

Answer: 38 molecules

Question: How many ATP molecules will be produced in muscles by aerobic oxidation of one molecule of glucose?

• a) 36
• b) 34
• c) 4
• d) 2

Answer: 36

Question: Plants, but not animals, can convert fatty acids to sugars by a series of reactions called

• a) Glyoxylate cycle
• b) Glycolysis
• c) Krebs cycle
• d) Photosynthesis

Answer: Glyoxylate cycle

Question: Pasteurization is a process, which means heating of drinks. It is carried out, at what temperature and for how much duration?

• a) 60-70°C and 30 minutes
• b) 80°C and 30 minutes
• c) 70°C and 60 minutes
• d) 120°C and 60 minutes

Answer: 60-70°C and 30 minutes