Diversity of Animals — DU B. Sc. Life Science (Zoology) Previous Year Question Papers

2. Attempt FOUR questions in all. 4. Illustrate your answers with diagram wherever necessary. (a) Define the following terms (Any Five): (5) (iii) Catadromous migration (v) Binomial nomenclature (vi) Stone canal (b) Give the scientific name of the following terms (Any Four) : (2) (1) Acorn worm (ii) Saw fish (Il1) Portuguese man-of-war (iv) Feather star (v) Tree frog (c) Distinguish between the following terms (Any (il) Pseudocoelomate and coelomate animals (iii) Apposition and superposition vision (Iv) Torsion and detorsion (v) Flagella and cilia 2. (a) Outline the life cycle of Ascaris lumbricoides and include a brief note on its adaptations for parasitism. (6+3=9) (b) Describe the phenomenon of polymorphism in Hydrozoa highlighting its types and functions within the colony. (6) 3. (a) Explain the types of canal systems found in Porifera describing their structure and functions. (b) Describe the process of pearl formation in molluscs. (7) 4. (a) Explain the process of osmoregulation in fishes detailing the mechanisms used by freshwater and marine species to maintain water and salt balance. (b) Describe the biting mechanism in snakes highlighting the structure and function involved. (5) S. (a) Discuss the adaptations for flight in birds explaining the structural and physiological modifications that enhance flight efficiency. (9) (b) Describe parental care in amphibians its various forms with examples. (6) 6. Write short notes on Any Three of the following topics: (i) Metamerism in Annelida (il) Retrogressive metamorphosis in Protochordates (Ill) Locomotion in Amoeboids (iv) Origin of Mammals (v) Metamorphosis in Insects