Q.No.2. Describe in detail the structure, physiology and action of phytochromes in plants. Also classify the plants with respect to their responses to daylight. (20)

Q.No.3. What is photophosphorylation? Write a detailed note on light reaction at PSI and PSII.(20)

Q.No.4. The plants as solitary component of nature are always subject to environmental perturbations. Describe in detail how do climatic and edaphic factors influence plant life. (20)

Q.No.5. Salinity and water logging reduced plant productivity drastically. Give in detail their causes of occurrence and how saline and waterlogged soils can be reclaimed.(20)

Q.No.6. Write note on the structure and function of nucleus, chloroplast, mitochondria and peroxisomes in a plant cell. (20)

Q. No. 7. Give a detailed account of chromosomal aberrations. How they are important to evolutionary tendencies in plant.

Q.No.8. Define evolution. Write detailed notes on the evolutionary theories put forward by Darwin and Lamarck. (20)

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