Respiration in Plants MCQs Multiple Choice Questions with Answers

1. Photochemical reaction in the chloroplasts is directly involved in the…?
a. Fixation of carbondioxide
b. Synthesis of glucose and starch
c. Formation of phosphoglyceric acid
d. Photolysis of water and phosphorylation of ADP to ATP
Answer: d. Photolysis of water and phosphorylation of ADP to ATP

2. Which of the following elements are essential for the photolysis of water?
a. Ca and Cl
b. Mn and Cl
c. Zn and I
d. Cu and Fe
Answer: b. Mn and Cl

3. The fastest acting enzyme in the biological kingdom is…?
a. Lipase
b. Amylase
c. Peptides
d. Carbon anhydrase
Answer: d. Carbon anhydrase

4. Pyruvic acid is formed during which of the following process?
a. Kerb cycle
b. Glycolysis
c. Ornithine cycle
d. Calvin cycle
Answer: b. Glycolysis

5. Urease enzyme was obtained from:
a. Urine
b. Canavalia
c. Ficus fruit
d. Pancreas
Answer: b. Canavalia

6. Apoenzyme is a:
a. Protein
b. Vitamin
c. Carbohydrates
d. Amino acid
Answer: a. Protein

7. The substrate for photorespiration is:
a. Glycolate
b. Glucose
c. Lipid
d. Sucrose
Answer: a. Glycolate

8. Which one of the following contains copper besides iron?
a. Cytochrome-f
b. Cytochrome oxidase
c. Plastoquinone
d. Cytochrome –C1
Answer: b. Cytochrome oxidase

Recommended: Respiration in Plants Practice Test

9. Peroxisome is associated with…?
a. Photosynthesis
b. Respiration
c. Photorespiration
d. Photophosphorylation
Answer: c. Photorespiration

10. Where does the formation of Acetyl-CoA (acetyl coenzyme A) from pyruvic acid take place?
a. Mitochondria
b. Chloroplasts
c. Cytoplasm
d. Golgi body
Answer: a. Mitochondria

11. The number of ATP molecules produced by the electron transport system from the Krebs cycle intermediate in a single turn is…?
a. 11
b. 12
c. 13
d. 16
Answer: a. 11

12. The first electron acceptor in photosystem- I of the cyclic photophosphorylation is…?
a. Cytochrome
b. Plastocynain
c. Ferredoxin
d. Plastoquinone
Answer: c. Ferredoxin

13. In anaerobic respiration the number of ATP molecules produced are:
a. 1
b. 2
c. 3
d. 8
Answer: b. 2

14. Which of the following enzyme is not used in the Krebs cycle?
a. Aconitase
b. Decarboxylase
c. Aldolase
d. Disease
Answer: c. Aldolase

15. What is the end product of alcoholic fermentation?
a. C3H6O3
b. C2H5OH
c. H2O and CO2
d. CO2 and C2H5OH
Answer: d. CO2 and C2H5OH

16. Which of the following step of cellular respiration does NOT require oxygen?
a. Krebs cycle
b. Chemiosmosis
c. Electron transport chain
d. Glycolysis
Answer: d. Glycolysis

17. The process of plant respiration is the opposite of which process that occurs in plants?
a. Animal respiration
b. Photosynthesis
c. Breathing
d. Glycolysis
Answer: b. Photosynthesis

18. What stage of cellular respiration produces the most ATP molecules?
a. Krebs cycle
b. Chemiosmosis
c. Electron transport chain
d. Glycolysis
Answer: c. Electron transport chain

19. How do plants breathe?
a. Through the stomata
b. Through the stem
c. Through the chloroplast
d. Through the root hairs
Answer: a. Through the stomata

20. In which part of the plant cell does photosynthesis takes place?
a. Chloroplast
b. Mitochondria
c. Vacuole
d. Cell wall
Answer: a. Chloroplast

21. Which of the following chemist discovered the process of fermentation in 1857?
a. Robert Koch
b. Louis Pasteur
c. Antoine Lavoisier
d. Joseph Louis
Answer: b. Louis Pasteur

22. What are the final products of photosynthesis?
a. Carbohydrates and Oxygen
a. Glucose and Oxygen
b. Carbon dioxide and Oxygen
c. Nitrogen and CO2
Answer: a. Glucose and Oxygen

23. The synthesized food in plants is stored as…?
a. Proteins
b. Vitamins
c. Starch
d. Fats
Answer: c. Starch

24. Which of the following is NOT needed for photosynthesis?
a. Chlorophyll
b. Water
c. Oxygen
d. Carbon dioxide
Answer: c. Oxygen

25. Alpha-Ketoglutarate dehydrogenase results in…?
a. Decarboxylation
b. Oxidation
c. Reduction
d. Oxidation and Decarboxylation
Answer: d. Oxidation and Decarboxylation

26. Which of the following is a product of aerobic respiration?
a. Lactic acid
b. Ethylene
c. Malic acid
d. Lactose
Answer: c. Malic acid

27. The energy gained during aerobic respiration is………times more than that of anaerobic respiration:
a. 12
b. 19
c. 30
d. 5
Answer: b. 19

28. Oxidation of 1 molecule of glucose in aerobic respiration results in the production of…?
a. 12 ATP molecules
b. 38 ATP molecules
c. 30 ATP molecules
d. 5 ATP molecules
Answer: b. 38 ATP molecules

29. In mitochondria, protons accumulate in the…?
a. Intermembrane space
b. Outer membrane
c. Matrix
d. Inner membrane
Answer: a. Intermembrane space

30. What is the first product formed in the Krebs cycle?
a. Pyruvic acid
b. Lactic acid
c. Malic acid
d. Citric acid
Answer: d. Citric acid

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