Third Semester M.Sc. Degree Examination, March 2025BotanyBO 232: BIOCHEMISTRY, PLANT PHYSIOLOGY AND RESEARCHMETHODOLOGY

Third Semester M.Sc. Degree Examination, March 2025

Botany

BO 232: BIOCHEMISTRY, PLANT PHYSIOLOGY AND RESEARCH

METHODOLOGY

Time: 3 Hours

(2019 Admission Onwards)

Max. Marks: 75

(Instruction: Draw diagrams and illustrate with examples wherever necessary)

1.Answer the following questions.

1.What is Km value? Mention its significance.

2.Draw the structure of sucrose.

3.List any two-sulphur containing amino acids.

4.What is salinity stress?

5.Name any two weedicides.

6.What is lag phase?

7.What are phytoalexins?

8.What are quantasomes?

9.What is biochemical methodology of experimental design?

10. List any two statistical tools for the citation of reference.

(10 × 1 = 10 Marks)

II.Answer the following questions not more than 50 words.

11. (a) Compare pH and pKa? Mention its significance.

(b) What is monoacyl glycerol? Explain its biosynthesis.

12. (a) Explain the classification of protein based on function.

(b) Compare secondary and quaternary structure of proteins.

13. (a) What is a biological clock? How does it differ from water oxidizing clock?

(b) How does the breakdown of fatty acids occur during seed germination?

14. (a) Compare symbiotic and nonsymbiotic nitrogen fixation in plants.

(b) Compare phloem loading and phloem unloading.

15. (a) What are the essential tips for preparing the methodology section of a research paper?

(b) Explain the importance of the abstract and title in a thesis.

(5 x 2 = 10 Marks)

III. Answer the following questions not more than 150 words.

16. (a) What are abzymes? Give an example.

(b) Explain mevalonic acid pathway of terpenoids.

17. (a) What are protein domains? Mention it importance in enzyme activity.

(b) Describe the oxidation of lipids. Mention different types of it.

18. (a) Briefly describe the structure and biosynthesis of adenine.

(b) What is RUBISCO? Mention its importance.

19. (a) Give a concise account on cold stress and its physiologic response in plants.

(b) Explain the various physiological effects of ethylene.

20. (a) Draw the schematic representation of glycolate metabolism.

(b) Explain the physiology of abscission.

21. (a) Write an account on the structure and functions of phytochromes.

(b) What is allelopathy? Mention its importance in plants with examples.

22. (a) Write an account on various steps of a research design.

(b) Write a note on the use of statistical tools and the interpretation of results with any statistical tool you have studied.

(7 x 5 = 35 Marks)

III. Answer the following questions in not more than 250 words.

23. (a)Explain the structure, function and metabolism of starch.

(b) Explain IUB system of classification and nomenclature of enzymes. Add a note on its regulation of enzyme activity.

24. (a) Create a schematic representation of the C3 pathway and provide an explanation. Why are CAM plants called so?

(b) Critically analyze aerobic and anaerobic respiration in plants. Add a note on the regulation of the TCA cycle.

(2 x 10 = 20 Marks)

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