Please refer to Respiration in Plants Class 11 Biology Important Questions with answers below. These solved questions for Chapter 14 Respiration in Plants in NCERT Book for Class 11 Biology have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these solved problems properly as these will help them to get better marks in your class tests and examinations. You will also be able to understand how to write answers properly. Revise these questions and answers regularly. We have provided Notes for Class 11 Biology for all chapters in your textbooks.

Important Questions Class 11 Biology Chapter 14 Respiration in Plants

Objective Questions

Question. ATP is
(a) an energy currency
(b) a nucleotide
(c) formed in both respiration and photosynthesis
(d) all of the above

Question. During the process of respiration, which of the followings are released as products?
(a) CO₂, H₂O and O₂
(b) CO₂, O₂ and energy
(c) CO, H₂O and energy
(d) CO₂, H₂O and energy

Question. The enzymes, involved in the chemical reactions of glycolysis are located
(a) in the fluid matrix of cytoplasm.
(b) in the mitochondrial matrix.
(c) in the nuclear sap.
(d) on the cristae of a mitochondria.

Question. Decarboxylation is not involved in
(a) electron transport system
(b) glycolysis
(c) Kreb’s cycle
(d) alcoholic fermentation

Question. When oxygen is not available to a muscle cell, NADH formed during glycolysis does not pass electrons to the ETS. Instead, it passes hydrogen atoms to
(a) acetyl CoA
(b) pyruvic acid
(c) fructose
(d) ADP

Question. In the fermentation of one glucose molecule, there is a net gain of ______________ molecules of ATP.
(a) one
(b) two
(c) six
(d) eight

Question. Which one of the following reactions is an example of oxidative decarboxylation?
(a) Conversion of succinate to fumarate.
(b) Conversion of fumarate to malate.
(c) Conversion of pyruvate to acetyl CoA.
(d) Conversion of citrate to isocitrate.

Question. In which one of the following do the two names refer to tricarboxylic acid cycle?
(a) α-ketoglutaric acid and Krebs cycle
(b) Malic acid cycle and Kornberg cycle
(c) Citric acid cycle and Krebs cycle
(d) Oxaloacetic acid and Kornberg cycle

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : The atmospheric concentration of CO₂ at which photosynthesis just compensates for respiration is referred to as CO₂ compensation point.
Reason : The CO₂ compensation point is reached when the amount of CO₂ uptake is less than that generated through respiration because the level of CO₂ in the atmosphere is more than that required for achieving CO₂ compensation point.

Question. Assertion : Glycolysis is the first step of respiration in which glucose completely breaks into CO₂ and H₂O.
Reason : In this process, there is net gain of twenty four molecules of ATP.

Critical Thinking Type Questions

Question. Reduced form of ubiquinone is
(a) ubiquinine
(b) ubiquinol
(c) ubiquitine
(d) all of the above

Question. Acetyl CoA is formed by the breakdown of
(a) fats
(b) fatty acid
(c) glycerol
(d) PGAL

Question. In alcoholic fermentation
(a) oxygen is the electron acceptor.
(b) triose phosphate is the electron donor while acetaldehyde is the electron acceptor.
(c) triose phosphate is the electron donor while pyruvic acid is the electron acceptor.
(d) there is no electron donor.

Question. Inside an active mitochondrion, most electrons follow which pathway ?
(a) Glycolysis → NADH → Oxidative phosphorylation → ATP → O₂
(b) Krebs’ cycle → FADH₂ → ETS → ATP
(c) ETS → Krebs’ cycle → ATP → O₂
(d) Krebs’ cycle → NADH + H+ → Electron transport chain → O₂

Question. Fermentation is represented by the equation

Question. Conversion of phosphoglyceraldehyde to 1, 1-biphosphoglyceric acid is a
(a) primary reaction only
(b) redox reaction only
(c) primary and redox reaction
(d) substrate level phosphorylation reaction

Question. In which one of the following reactions, substrate level phosphorylation does not occur?
(a) 1, 3-biphosphoglyceric acid → 3, phosphoglyceric acid
(b) Glucose-6-phosphate → Fructose 6 phosphate
(c) Succinyl CoA → Succinic acid
(d) Phosphoenol pyruvic acid → pyruvic acid

Question. Lactic acid is formed by the process of
(a) fermentation
(b) HMP pathway
(c) glycolysis
(d) none of these

Question. Cytochrome oxidase is a/an
(a) exoenzyme
(b) endoenzyme
(c) proenzyme
(d) coenzyme