CBSE Class 11 Biology Respiration in Plants MCQs

Question : What is the end product of glycolysis of a glucose molecule
a) Pyruvate and ATP
b) Phosphoglyceraldehyde
c) Lactic acid and ATP
d) Fructose 1, 6- diphosphate
Answer : A

Question : Connecting link between glycolysis and Krebs cycle is/ before entering Krebs cycle pyruvate is changed to
a) acetyl CoA
b) phosphoenol pyruvate
c) oxaloacetate
d) pyruvate
Answer : A

Question : Site of respiration in bacteria is
a) mesosome
b) episome
c) ribosome
d) microsome
Answer : A

Question : Which of the following processes make direct use of oxygen ?
a) Electron transport
b) Fermentation
c) citric acid cycle
d) None of these
Answer : A

Question : In Kreb’s cycle, the FAD participates 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) None of these
Answer : A

Question : The major reason that glycolysis is not as energy productive as respiration is that
a) pyruvate is more reduced than CO₂; it still contains much of the energy from glucose
b) it does not take place in a specialized membrane-bound organelle.
c) it is the pathway common to fermentation and respiration
d) None of these
Answer : B

Question : Which of the following is a 4-carbon compound?
a) Oxaloacetic acid
b) Phosphoglyceric acid
c) Citric acid
d) Phosphoenol pyruvate
Answer : A

Question : Which of the following is a biological uncoupler of oxidative phosphorylation ?
a) Thermogenin
b) 2, 4 – Dichlorophenoxy acetic acid
c) 2, 4 – Dinitrophenol
d) Ethylene diaminotetra acetic acid
Answer : A

Question : Which of the following is not true for oxidative phosphorylation?
a) It uses oxygen as the initial electron donor.
b) It involves the redox reactions of electron transport chain
c) It involves an ATP synthase located in the inner mitochondrial membrane.
d) It depends on chemiosmosis
Answer : C

Question : Final electron acceptor in oxidative phosphorylation is
a) oxygen
b) hydrogen
c) cytochrome
d) None of these
Answer : oxygen

Question : Quantasomes are found in
a) chloroplast
b) mitochondria
c) lysosome
d) None of these
Answer : A

Question : Which of the following is an important intermediate found in all the types of respiration ?
a) Pyruvic acid
b) Tricarboxylic acid
c) Acetyl CoA
d) Oxaloacetate
Answer : A

Question : Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as
a) Glycolysis
b) Krebs cycle
c) TCA-pathway
d) HMS-pathway
Answer : A

Question : Common enzyme in glycolysis and pentose phosphate pathways is
a) hexokinase
b) fumarase
c) aconitase
d) dehydrogenase
Answer : A

Question : One of the following is common to glycolysis as well as Krebs cycle in eukaryotes
a) Substrate level phosphorylation
b) Photophosphorylation
c) Localization in mitochondria
d) None of these
Answer : A

Question : A mutant cell lacking mitochondria will show
a) Inability to oxidize carbohydrates and fats
b) Inability to synthesize glucose
c) Inability to oxidize fats
d) Inability to oxidize carbohydrates
Answer : B

Question : 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?
a) Depletion of oxygen
b) Depletion of mineral salts
c) Accumulation of waste products
d) Depletion of glucose
Answer : A

Question : Hexose monophosphate shunt does not take place when
a) NAD is available
b) NAD is not available due to shortage of oxygen
c) Glucose is the substrate
d) Oxygen is not enough
Answer : A

Question : Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
a) proton gradient
b) accumulation of Na ions
c) membrane potential
d) None of these
Answer : A

Question : The energy-releasing process in which the substrate is oxidised without an external electron acceptor is called
a) glycolysis
b) photorespiration
c) fermentation
d) aerobic respiration
Answer : A