Students of class 11 Biology should refer to MCQ Questions Class 11 Biology Respiration in Plants with answers provided here which is an important chapter in Class 11 Biology NCERT textbook. These MCQ for Class 11 Biology with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Biology. The following MCQs can help you to practice and get better marks in the upcoming class 11 Biology examination

Chapter 14 Respiration in Plants MCQ with Answers Class 11 Biology

MCQ Questions Class 11 Biology Respiration in Plants provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Glycolysis give rise to
(a) 8ATP, 2NADH(H⁺), 2 Pyruvate
(b) 2ATP, 2CoA, 2NADH(H⁺)
(c) 2ATP, 2NADH(H⁺) ,2 Pyruvate
(d) 2ATP, 2 acetate, 2NADH(H⁺)

Question. The following is required both by the process of respiration and photosynthesis
(a) Carbohydrates
(b) Sunlight
(c) Chlorophyll
(d) Cytochromes

Question. In the electron transport chain during terminal oxidation, the cytochrome, which donates electrons to O₂  is ?
(a) Cytochrome-b
(b) Cytochrome-C
(c) Cytochrome-a₃
(d) Cytochrome-f

Question. Number of ATP molecules formed during aerobic respiration in break down of one glucose molecule via malate aspartate shuttle.
(a) 38
(b) 18
(c) 28
(d) 4

Question. Respiration in plants
(a) Occurs only during day
(b) Results in the formation of vitamins
(c) Occurs both during day and night
(d) Often requires CO₂ 

Question. Respiration occurs in
(a) All living cells both in lights & dark
(b) Non green cells only in light
(c) Non green cells in both light and dark
(d) All living cells in light only

Question. R.Q. of germinating ground nut & castor seed is
(a) 1
(b) <1
(c) >1
(d) 0

Question. The value of RQ of a ripening fatty seed is
(a) <1
(b) >1
(c) zero
(d) Unity

Question. Conversion of pyruvic acid into ethyl alcohol is mediated by –
(a) Phosphatase
(b) Dehydrogenase
(c) Decarboxylase & dehydrogenase
(d) Catalase

Question. What causes R.Q. to vary ?
(a) Respiratory Substrate
(b) Light & O₂ 
(c) Respiratory Product
(d) Temperature

Question. Anaerobic respiration takes place in :
(a) Ribosome
(b) Nucleus
(c) Cytoplasm
(d) Vacuole

Question. The formation of Acetyl Co-A from pyruvic acid is the result of its
(a) Reduction
(b) Dehydration
(c) Phosphorylation
(d) Oxidative decarboxylation

Question. During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP ?
(a) Conversion of pyruric acid to acetyl Co A
(b) Electron transport chain
(c) Glycolysis
(d) Krebs cycle

Question. The common phase between aerobic & anaerobic respiration is
(a) TCA cycle
(b) Kreb’s cycle
(c) Glycolysis
(d) Photo respiration

Question. Energy obtained by a cell from catabolic reaction is stored immediately in the form of
(a) Pyruvic acid
(b) Glucose
(c) ATP
(d) DNA

Question. There is gain of how many ATP in aerobic respiration of eukaryotic cell ?
(a) 28 ATP
(b) 36 ATP
(c) 20 ATP
(d) 40 ATP

Question. Which enzyme break downs the fructose-1, 6-Diphosphate ?
(a) Hexokinase
(b) Phosphatase
(c) Aldolase
(d) None

Question. Substrate concentration at which an enzyme attains half of its max. velocity is ?
(a) Half life of enzyme
(b) Km-constant of enzyme
(c) Concentration ratio
(d) None

Question. Who coined the term enzyme ?
(a) Pasteur
(b) Buchner
(c) Kuhne
(d) Sumner

Question. Acceptor of acetyl Co-A in Kreb’s-cycle is
(a) Malic acid
(b) Fumaric acid
(c) a – ketoglutaric acid
(d) Oxalo acetic acid

Question. Which of the following ETS complex is inhibited by cyanide –
(a) Complex II
(b) Complex V
(c) Complex IV
(d) Complex III

Question. In which one of the following do the two names refer to one and the same thing :-
(a) Kreb’s cycle and Calvin cycle
(b) Tricarboxylic acid cycle and citric acid cycle
(c) Citric acid cycle and Calvin cycle
(d) Tricarboxylic acid cycle and urea cycle

Question. In plants enzymes are present in
(a) Only in flowers
(b) Only in leaves
(c) All the living cells of plant body
(d) Only in parenchyma

Question. Which is the site of Kreb’s cycle –
(a) Chloroplast
(b) Golgibody
(c) Mitochondria
(d) Endoplasmic

Question. First discovered Enzyme was
(a) Isomerase
(b) Transaminase
(c) Zymase
(d) Transferase

Question. Enzyme were discovered for the first time in
(a) Bacteria
(b) Yeast
(c) Algae
(d) Spinach

Question. Vitamin serves the function of :-
(a) An enzyme
(b) A coenzyme
(c) A holoenzyme
(d) A hormone

Question. Number of ATP produced from one pyruvic acid during conversion to acetyl Co-A –
(a) 6
(b) 3
(c) 12
(d) 15

Question. Product formed by the activity of malic dehydrogenase is
(a) Fumaric acid
(b) Malic acid
(c) Oxaloacetic acid
(d) Succinic acid

Question. Which of the following is not consumed in a biochemical process ?
(a) Hormone
(b) Enzyme
(c) vitamin
(d) Nucleotide

Question. Enzyme inhibition caused by a substrate analogue is
(a) Competitive
(b) Non competitive
(c) In competitive
(d) Semi-competitive

Question. Which of the following is a coenzyme ?
(a) NAD
(b) NADP
(c) FAD
(d) All the above

Question. Which of the following coenzyme is a derivative of pantothenic acid ? (vit – B complex) ?
(a) NAD
(b) NADP
(c) FAD
(d) Co-A

Question. At boiling temperature an enzyme is
(a) Denatured
(b) Unaffected
(c) Inactivated
(d) Killed

Question. SLP net gain of ATP from one molecule of glucose during glycolysis or EMP pathaway –
(a) 2 ATP
(b) 6 ATP
(c) 36 ATP
(d) 38 ATP

Question. How the presence of an enzyme affects the activation energy of a reaction ?
(a) It becomes increased
(b) It becomes decreased
(c) It is first increased and then decreased
(d) Activation energy in not affected at all

Question. When the evolution of CO₂ is more than the intake of O2, the respired substrate should be
(a) Fatty acid
(b) organic acid
(c) Glucose
(d) Polysaccharides

Question. The first preferred respiratory substrate is
(a) Glucose
(b) Fats
(c) Proteins
(d) Polypeptide

Question. Enzyme concerned with transfer of electrons are :
(a) Hydrolasase
(b) Dehydrogenase
(c) Transaminase
(d) Protease

Question. Which of the following is 5 -carbon compound of Kreb’s cycle ?
(a) Citric acid
(b) Fumaric acid
(c) Oxalosuccinic acid
(d) a – Ketoglutaric acid

Question. Inhibition of succinic dehydrogenase by malonate is an example of
(a) Competitive inhibition
(b) Non competitive inhibition
(c) Allosteric inhibition
(d) Enzyme repression

Question. Which enzyme is chemically not a protein ?
(a) Hexokinase
(b) Synthetase
(c) Endonuclease
(d) Ribozyme

Question. Enzyme have very narrow optima for :-
(a) Light
(b) Temperature
(c) pH
(d) Humidity

Question. Substrate level net gain of ATP molecules during complete oxidation of 1 molecule of glucose–
(a) 8 ATP
(b) 6 ATP
(c) 4 ATP
(d) 2 ATP

Question. How many net ATP generates in aerobic respiration via glycerol phosphate shuttle in eukaryotes ?
(a) 38 ATP
(b) 36 ATP
(c) 40 ATP
(d) 80 ATP

Question. In glycolysis, during oxidation electrones are removed by :
(a) Molecular oxygen
(b) ATP
(c) Glyceraldehyde
(d) NAD⁺

Question. The full form of NADP is
(a) Nicotine adenosine diphosphate phosphate
(b) Nicotinamide adenosine dinucleotide phosphate
(c) Nicotinamide adenine dinucleotide phosphate
(d) Nicotinamide adenine diphosphate phosphate

Question. Cyanide resistant respiration is found in –
(a) Homo sapiens
(b) Brassica
(c) Spinach 
(d) Bacteria

Question. In alcohol fermentation :- 
(a) Triose phosphate is the electron donor, while acetaldehyde is the electron acceptor
(b) Triose phosphate is the electron donor, while pyruvic acid is the electron acceptor
(c) There is no electron donor
(d) Oxygen is the electron acceptor

Question. How many molecules of ATP are produced per molecule of FADH2 oxidised ?
(a) One
(b) Two
(c) Three
(d) four

Question. How many ATP equivalents are produced by the oxidation of succinate into fumarate ?
(a) 1 ATP
(b) 2 ATP
(c) 3 ATP
(d) 4 ATP

Question. Which of the following statements regarding enzyme inhibition is correct ?
(a) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
(b) Competitive inhibition is seen, when a substrate competes with an enzyme for binding to an inhibitor protein
(c) Competitive inhibition is seen, when the substrate and the inhibitor compete for the active site on the enzyme
(d) Non-competitive inhibitors often bind to the enzyme irreversibly.

Question. Which of the following is link between carbohydrate and fat metabolism ?
(a) CO₂
(b) Acetyl Co-A
(c) Pyruvic acid
(d) Citric acid

Question. Allosteric enzymes have allosteric sites for –
(a) Inhibition only
(b) Activation only
(c) Reduction in activation energy
(d) Both activation and inhibition

Question. The first member of TCA cycle is
(a) Oxalo succinic acid
(b) Oxalo acetic acid
(c) Citric acid
(d) Cis aconitic acid

Question. The net gain of ATP molecules by glycolysis in aerobic condition is
(a) Zero
(b) Two
(c) Four
(d) Eight

Question. Which component of ETS is mobile carrier ?
(a) UQ (CO-Q)
(b) Cyt – a
(c) Cyto – b
(d) Cyt – f

Question. The value of RQ of starved cell is
(a) Zero
(b) 0.9 / Less than one
(c) 1 / unity
(d) infinite

Question. How many ATP molecules produced from the complete oxidation of a molecule of active acetate or acetyl Co-A ? 
(a) 38 ATP
(b) 15 ATP
(c) 12 ATP
(d) 4 ATP