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Class 11 Biology MCQ Questions of Respiration in Plants with Answers?

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Practice MCQ Questions for class 11 Biology Chapter-Wise

1. The complete oxidation of pyruvate take place in

(a) cell cytoplasm
(b) inner mitochondrial membrane
(c) mitochondrial matrix
(d) nucleus

2. Malacophily means

(a) pollination by wind
(b) pollination by water
(c) pollination by insects
(d) pollination by snails

3. The final electron acceptor in electron transport chain is

(a) Cytochrome C
(b) FADH
(c) NADH
(d) oxygen

4. Respiratory quotient of carbohydrates is

(a) 0.9
(b) 1.2
(c) 1
(d) 0

5. One molecule of glucose yields .......... ATP molecules in aerobic respiration.

(a) 2
(b) 16
(c) 38
(d) 42

6. Out of 38 ATP molecules produced per glucose, 32 ATP molecules are formed from \(NADH/FADH_2\) in:

(a) respiratory chain
(b) Krebs cycle
(c) oxidative decarboxylation
(d) EMP

7. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as

(a) TCA-pathway
(b) Glycolysis
(c) HMS-pathway
(d) Krebs cycle

8. Connecting link between glycolysis and Krebs cycle is/before entering Krebs cycle pyruvate is changed to:

(a) oxaloacetate
(b) PEP
(c) pyruvate
(d) acetyl CoA

9. When one glucose molecule is completely oxidized, it changes:

(a) 36 ADP molecules into 36 ATP molecules
(b) 38 ADP molecules into 38 ATP molecules
(c) 30 ADP molecules into 30 ATP molecules
(d) 32 ADP molecules into 32 ATP molecules

10. Acetyl CoA forms a 6-C compound after combining with

(a) Oxygen
(b) Pyruvic acid
(c) Citric acid
(d) Oxaloacetic acid

11. 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

12. Hexose monophosphate shunt does not take place when

(a) NAD is available
(b) NAD is not available due to a shortage of oxygen
(c) Glucose is the substrate
(d) Oxygen is not enough

13. Apparatus to measure rate of respiration and RQ is 

(a) auxanometer
(b) potometer
(c) respirometer
(d) manometer

14. Terminal cytochrome of respiratory chain which donates electrons to oxygen is

(a) cyt. b
(b) cyt. c
(c) cyt. \(a_1\)
(d) cyt.- \(a_3\)

15. End product of citric acid/Krebs cycle is

(a) citric acid
(b) lactic acid
(c) pyruvic acid
(d) \(CO_2+H_2O\)

16. Chemiosmotic theory of ATP synthesis in the chloroplast and mitochondria is based on

(a) membrane potential
(b) accumulation of \(Na^+\) ions
(c) accumulation of \(K^+\) ions
(d) proton gradient

17. How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal? 

(a) 30
(b) 57
(c) 1
(d) 2

18. Respiratory quotient (RQ) for fatty acid is

(a) > 1
(b) < 1
(c) 1
(d) 0

19. In which one of the following processes \(CO_2\) is not released?

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

20. Acetyl CoA combine with oxalo-acetate in presence of condensing enzyme citrate synthase to form 6-C compound called

(a) Malic acid
(b) Tartaric acid
(c) Pyruvic acid
(d) Citric acid

21. A characteristic of drupe is

(a) fleshy seed coat
(b) stony pericarp
(c) stony mesocarp
(d) stony endocarp

22. EMP can produce a total of

(a) 6 ATP
(b) 8 ATP
(c) 24 ATP
(d) 38 ATP

23. In glycolysis, during oxidation electrons are removed by 

(a) ATP
(b) glyceraldehyde-3-phosphate
(c) NAD+
(d) molecular oxygen

24. 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) lactate dehydrogenase
(b) isocitrate dehydrogenase
(c) malate dehydrogenase
(d) succinate dehydrogenase

25. What is the role of NAD⁺ in cellular respiration?

(a) It functions as enzymes
(b) It functions as an electron carrier
(c) It is a nucleotide source for ATP synthesis
(d) It is the final electron acceptor for anaerobic respiration

Answer 2

 1. Answer: (c) mitochondrial matrix 

Explanation: Pyruvate is produced by glycolysis in the cytoplasm, but pyruvate oxidation takes place in the mitochondrial matrix (in eukaryotes). So, before the chemical reactions can begin, pyruvate must enter the mitochondrion, crossing its inner membrane and arriving at the matrix.

2. Answer: (d) pollination by snails

Explanation: Malacophily refers to when pollination of plants occurs through snails.

3. Answer: (d) oxygen

Explanation: The electron transport chain is the portion of aerobic respiration that uses free oxygen as the final electron acceptor of the electrons removed from the intermediate compounds in glucose catabolism.

4. Answer: (c) 1

Explanation: The carbohydrates have equal numbers of carbon and oxygen in their molecules. When carbohydrates are used as substrate, then the RQ will be 1, because equal amounts of carbon dioxide and oxygen are evolved and consumed.

5. Answer: (c) 38

Explanation: Energy gain in one complete cycle of aerobic respiration. In aerobic respiration complete oxidation of one glucose molecule produces 38 ATP molecules.

6. Answer: (a) respiratory chain

Explanation: Most of the ATP molecules are produced in the respiratory chain as \(NADH/FADH_2\) are oxidised and electrons are transferred through a series of complexes in the respiratory chain or the electron transport chain present in the inner membrane of mitochondria.

7. Answer: (b) Glycolysis

Explanation: Glycolysis is the sequence of enzyme-mediated reactions by which glucose is degraded anaerobically into pyruvic acid in the cell cytoplasm.

8. Answer: (d) acetyl CoA

Explanation: The link between glycolysis and the Krebs cycle is Acetyl-CoA or Acetyl-Coenzyme A. The molecule is an acetyl group carried by the coenzyme A and is also known as CoASH or CoA.

9. Answer: (b) 38 ADP molecules into 38 ATP molecules

Explanation: When one glucose molecule is completely oxidized, it changes. In aerobic respiration or biological oxidation of one glucose molecule, 38 ADP molecules change into 38 ATP molecules, where donor phosphate is inorganic phosphate.

10. Answer: (d) Oxaloacetic acid

Explanation: Acetyl CoA is the connecting link between glycolysis and Kreb's cycle. The end product of glycolysis is pyruvate. It is converted to Acetyl CoA which enters the Krebs cycle by combining with oxaloacetic acid (OAA) to form a 6 - C compound citric acid.

11. Answer: (a) Thermogenin

Explanation: As a transmembrane protein, thermogenin is also known as the uncoupling protein found in mitochondria. It is responsible for reducing the gradient of protons formed by oxidative phosphorylation.

12. Answer: (a) NAD is available

Explanation: When oxygen is available \(NADH_2\) produced in EMP-Krebs cycle pathway is released in the form of NAD. When there is shortage of oxygen NAD is not available and NADP takes up its place.

13. Answer: (c) respirometer

Explanation: Respirometer is an instrument used for measuring R.Q and rate of respiration. The apparatus consists of a graduated tube attached at right angles to a bulbous respiratory chamber in its upper end.

14. Answer:  (d) cyt.- \(a_3\)

Explanation: Cytochrome \(a_3\), which is the part of complex IV, cytochrome c oxidase transfers electrons to oxygen.

15.  Answer:  (d) \(CO_2+H_2O\)

Explanation:The Krebs cycle or citric acid cycle takes place in the mitochondrial matrix, starting by connecting acetyl CoA to citric acid forming oxaloacetic acid. The cycle continues in the presence of different enzymes through the production of different intermediates and the release of carbon dioxide and water as end products.

16. Answer: (d) proton gradient

Explanation: Chemiosmotic hypothesis for oxidative phosphorylation (ATP synthesis) was proposed by Peter Mitchell in 1961 for this he was awarded Noble Prize in 1978. This theory is based on proton gradient.

17.  Answer:(b) 57

Explanation:  Then the number of molecules that could be generated from one glucose molecule could be calculated by dividing the total energy by energy of one mole of ATP i.e. \(\frac{686}{12}=57\)

18. Answer: (b) < 1

Explanation: Respiratory quotient or R.Q is the ratio of carbon dioxide consumed to oxygen evolved. Carbohydrates are the most efficient compounds because the amount of carbon dioxide consumes and oxygen evolved is almost the same, therefore the RQ is one. For the fatty substances, RQ is less than 1 and for proteins, this is 0.9.

19. Answer: (d) Lactate fermentation

Explanation:The process in which \(CO_2\) is not released is the Lactate fermentation. Lactate fermentation is an anaerobic fermentation reaction that will take place in some types of bacteria and animal cells, like muscle cells.

20. Answer: (d) Citric acid

Explanation: This acid is formed by the condensation of acetyl CoA and oxaloacetate in the presence of citrate synthase. This enzyme is extensively found in mitochondria.

21. Answer: (d) stony endocarp

Explanation: The definitive characteristic of a drupe is that the hard, lignified stone is derived from the ovary wall of the flower. In an aggregate fruit, which is composed of small, individual drupes (such as a raspberry), each individual is termed a drupelet, and may together form an aggregate fruit.

22. Answer: (b) 8 ATP

Explanation: In the absence of oxygen, the cells take in small amounts of ATP through the process of fermentation. to ADP to form ATP with the help of the enzyme phosphoglycerokinase. These two NADH in turn produce six ATP molecules in the respiratory chain. Hence, a total of 8 ATP molecules can be produced by the EMP pathway.

23. Answer: (b) glyceraldehyde-3-phosphate

Explanation: In glycolysis, during oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate, electrons are removed by NAD⁺ and NADH + H⁺ is produced.

24. Answer: (d) succinate dehydrogenase

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

25.Answer: (b) It functions as an electron carrier

Explanation: The role of NAD⁺ is that it acts as an electron carrier. It accepts electrons from compounds by oxidizing them and adds H⁺ as well to give NADH. NADH is a reducing agent which then gives these electrons at the ETS. These electrons then flow through a series of complexes which result in the production of ATPs.

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