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

(d) Give reasons for the following: (1.5x2=3) i. Fishes living in freshwater secrete diluted urine. ii. Abomasum is called as true stomach 2. (a) Elucidate Osmoregulation in Marine Fishes. (b) What are some of the key adaptations that enable camels to thrive in extreme environments? (7.5 x 2=15) 3. (a) Describe how an action potential is propagated across a myelinated nerve? 4. (a) What is cardiac output, and what factors affect its regulation? (10) (b) Explain the adaptations of Maine Reptiles and Birds to maintain Osmotic balance. (5) 5. (a) Explain the role of enzymes in extracellular digestion of carbohydrates and proteins. (b) How do the structural and functional adaptations of the avian respiratory system support efficient gas exchange? (7.5 x 2=15) 6. Write short notes on any three of the following: (5 x 3= 15) (b) Echolocation in bats (c) Cellulose digestion in horse d) Open and Closed Circulatory System