1. The process of respiration in green plants occurs
a) only when stomata are open
b) only when photosynthesis ceases
c) only when photosynthesis is in progress
d) At all times
2. Respiratory enzymes are located in
a) mitochondrial matrix
b) cristae
c) perimitochondrial space
d) outer membrane
3. The site of glycolysis in a cell is
a) chloroplast
b) nucleus
c) cytoplasm
d) mitochondria
4. Respiration is
a) Anabolic process
b) Exothermic process
c) Endothermic process
d) Endergonic process
5. The annual plant exchange of gases takes place mainly through
a) Leaf scars
b) lenticels
c) stomata
d) stem
6. Kreb’s cycle take place in
a) vesicles of ER
b) Mitochondrial matrix
c) lysosomes
d) Dictyosomes
7. Common immediate source of energy in cellular activity:
a) NAD
b) ATP
c) DNA
d) RNA
8. Photorespiration involves
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Photorespiration involves three organelles:Chloroplast, Peroxisome and Mitochondria |
a) Glycolate cycle
b) kreb’s cycle
c) calvin cycle
d) CAM cycle
9. In succulent xerophytes the R.Q is :
a) Zero
b) unity
c) less than one
d) more than one
10. R.Q. of fatty substances is generally:
a) unity
b) Zero
c) more than one
d) less than one
11. Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzymes:
a) carboxylase
b)phosphatase
c) dehygrogenase
d) carboxylase and dehygrogenase
12. During respiration yeast converts glucose to
a) ethanol and water
b) ethanol and oxygen
c) ethanol and CO2
d) lactic acid and CO2
13. The net gain of ATP produced during the oxidation of one glucose molecule in a plant cell
a) 38 ATP molecules
b) 30 ATP molecules
c) 36 ATP molecules
d) 24 ATP molecules
14. The final acceptor of electrons in the electron transport chain is
a) Water
b) Oxygen
c) Hydrogen
d) Cytochrome b
15. In plant cell, digestion of fats occurs with the help of
a) lysosomes
b) Peroxisomes
c) glyoxisomes
d) microtubules
Answers:
1- d | 2- b | 3-c | 4-b | 5-c |
6-b | 7-b | 8-a | 9-a | 10-d |
11-d | 12-c | 13-c | 14-b | 15-c |
16.The ultimate respiratory substrate, yielding maximum number of ATP molecules, is
a) glycogen17. End product of citric acid/ Kreb’s cycle is
b) glucose
c) amylose
d) ketogenic amino acid

a) citric acid18. The first phase in the breakdown of glucose, in animal cell, is
b) pyruvic acid
c) latic acid
d) carbon dioxide and water
a) glycolysis19. End product of fermentation are
b) E.T.S
c) Kreb’s cycle
d) Glycolysis
a) O2 and C2H5OH
b) CO2 and O2
c) CO2 and C2H5OH
d) CO2 and acetyaldehyde
20. Out of 36 ATP molecules produced per glucose molecule during respiration
a) 2 are produced outside glycolysis and 34 during repiratory chain21. Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as
b) 2 are produced outside mitochondria and 34 inside the mitochondria
c) all the formed inside mitochondria
d) 2 during glycolysis and 34 during Krebs cycle
a) TCA pathway22. When one glucose molecule is completely oxidised, it changes
b) Glycolysis
c) HMS pathway
d) Glycolysis
a) 36 ADP molecules into 36 ATP molecules23. Link between glycolysis, Kreb’s cycle and β oxidation of fatty acid or carbohydrate and fat metabolism is
b) 38 ADP molecules into 38 ATP molecules
c) 30 ADP molecules into 30 ATP molecules
d) 32 ADP molecules into 32 ATP molecules
a) citric acid24. Terminal cytochrome of respiratory chain which donates electrons to oxygen is
b) succinic acid
c) acety CoA
d) Oxaloacetic acid

a) Cyt. b
b) Cyt.a1
c) Cyt.c
d) Cyt.a3
25. R. Q is ratio of
a) CO2 produced to substarate consumed
b) CO2 produced to O2 consumed
c) oxygen consumed to CO2 produced
d) Oxygen consumed to water produced
16. b) glucose
17. d) carbon dioxide and water
18. a) glycolysis
19. c) CO2 and C2H5OH
20.b) 2 are produced outside mitochondria and 34 inside the mitochondria
21. b) Glycolysis
22. b) 38 ADP molecules into 38 ATP molecules
23. c) acety CoA
24. d) Cyt.a3
25. b) CO2 produced to O2 consumed
Multiple Choice Questions on Cell Respiration
1. End product of aerobic respiration are
a) sugar and oxygenb) carbon dioxide, water, and energyc) carbon dioxide and energyd) water and energy
2. Oxidative phosphorylation is production of
a) ATP in photosynthesisb) ATP in respirationc) NADPH in Photosynthesisd) NADPH in respiration
3. End product of glycolysis

a) Acetyl CoAb) Pyruvic acidc) Glucose 1-phosphated) Fructose 1-phosphate
4. In alcohol fermentation

a) triose phosphate is the electron donor while acetyldehyde is the electron acceptorb) there is no electron donarc) oxygen is the electron acceptord) triose phosphate is the electron donar while pyruvic acid is the electron acceptor
5. EMP can produce a total of
a) 6 ATPb) 8 ATPc) 24 ATPd) 38 ATP
6. The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of
a) ATP in one large oxidation reactionb) Sugarsc) ATP in small stepwise unitsd) Nucleic acids
7. During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

a) Kreb’s cycleb) Glycolysisc) Electron transport chaind) Conversion of pyruvic acid to acetyl CoA
8. Which of the following is the key intermediate compound linking glycolysis to the Kreb’s cycle?
a) malic acidb) pyruvic acidc) acetyl CoAd) ATP
9. How many ATP molecules are produced by the aerobic oxidation of one molecule of glucose?
a) 8b) 30c) 36d) 38
10. R. Q. is
a) C/ N
b) N/C
c) CO2/O2
d) O2/ CO2
Answers
1. b) carbon dioxide, water, and energy
2. b) ATP in respiration
3. b) Pyruvic acid
4. a) triode phosphate is the electron donor while acetyldehyde is the electron acceptor
5. b) 8 ATP
6. c) ATP in small stepwise units
7. c) Electron transport chain
8. c) acetyl CoA
9. d) 38
10. c) CO2/O2