Biochemical Mechanisms and Responses in Plants — DU B. Sc. (Hons) Biochemistry Previous Year Question Papers

Semester VII There are 6 questions. IA. Define the followings: Apical dominance Enhancement effect iii. Glucosinolates Allelopathy vi. Denitrification B. Indicate whether True or False and justify your answer: i. Phytochromes exist in two interconvertible forms, Pr and Pfr. ii. Nitrogenase enzyme is active in the presence of oxygen. ili. Blue light enhances stomatal opening. Differentiate between the following: i. Symbiotic and Non-symbiotic nitrogen fixation ii. Amyloplast and Leucoplast iii. CAM and C4 photosynthesis mechanisms iv. Determinate and indeterminate nodules V. Somatic embryogenesis and Organogenesis 3A. Discuss the biological functions of the following plant hormones: Classify terpenoids. Give one example each of terpenoids used for: i. Perfume industry ii. Anti-inflammatory activity ili. Anticancer activity 4A. Explain the Z-scheme of electron transport in photosynthesis. B. Describe the regulation of the C4 pathway. C. Illustrate ATP synthesis through chemiosmotic coupling in chloroplasts. 5A. How is ammonia assimilated in plants? B. Explain protoplast isolation and fusion. C. Alternative reactions provide flexibility to plant glycolysis. Discuss in detail. 6. Write short note on followings: i. Nitrate reductase ii. Rubisco inhibitor ili. Vacuole in plant system iv. Phytochrome V. Glutamine synthetase