In This Post we are  providing Chapter-14 Respiration in Plants NCERT MCQ for Class 11 Biology which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON RESPIRATION IN PLANTS

Question 1 : In Krebs’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 : succinic acid to fumaric acid

Question 2 : 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 :  pyruvate is more reduced than CO₂; it still contains much of the energy from glucose

Question 3 : Which of the following is a 4-carbon compound?

• a) Oxaloacetic acid
• b) Phosphoglyceric acid
• c) Citric acid
• d) Phosphoenol pyruvate

Answer : Oxaloacetic acid

Question 4 : 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 : Thermogenin

Question 5 : 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 : It uses oxygen as the initial electron donor.

Question 6:  Final electron acceptor in oxidative phosphorylation is

• a) oxygen
• b) hydrogen
• c) cytochrome
• d) None of these

Answer : oxygen

Question 7 : Quantasomes are found in

• a) chloroplast
• b) mitochondria
• c) lysosome
• d) None of these

Answer : chloroplast

Question 8 : 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 : Pyruvic acid

Question 9 : 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 : Glycolysis

Question 10 : Common enzyme in glycolysis and pentose phosphate pathways is

• a) hexokinase
• b) fumarase
• c) aconitase
• d) dehydrogenase

Answer : hexokinase

Question 11 : 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 : Substrate level phosphorylation

Question 12 : 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 : Inability to oxidize carbohydrates and fats

Question 13 : 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 : Depletion of oxygen

Question 14 : 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 : NAD is available

Question 15 : Chemiosmosis 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 : proton gradient