Plant Physiology — DU B.Sc. (Hons) Biological Sciences Previous Year Question Papers

This paper contains six questions. Answer any four questions. Q3. (a) Discuss the role of cytokinins in delaying senescence. (6) (b) Discuss the relevance of phytochrome in photomorphogeneic processes in plants with the help of a suitable example. (9) Q4. (a) Discuss the different types of membrane transport systems in plants. Support your answer with the help of a well labelled diagram. (9) (b) Explain the most accepted theory to explain cell elongation in plants with the help of suitable diagram. (6) Q5. (a) List the criteria of essentiality of elements. Write the functions of any three macronutrients and three micronutrients. (9) (b) Discuss the cohesion-tension theory that explains ascent of sap in angiosperms. (6) Q6. (a) Explain the mechanism of stomatal movement with respect to the proton transport theory. (b) Discuss the factors responsible for seed dormancy. Elaborate upon the methods to overcome seed dormancy.