Aquatic Biology — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

Name-of the Course :B.Sc. Zoology/Life Science Attempt five questions in all. Draw diagrams wherever necessary. 1. (a) Define the following: (i) Euphotic Zone • (tii) Summer Stagnation (vili) Oligomixis (b) Distinguish between the following: (i) Hypolimnion and Epilimnion (ii) Lotic and Lentic ecosystems (iii) Agriculture and Industrial sewage Fringing reef and Barrier reef (U) Endemic and exotic species. (e) Expand the following : 1x4=4 (d) State whether the following statements are True or False: 1x5=5 (i) Dystrophic lake generally contains more than 350 ug/L Nitrogen content. (ii) Bioluminescence in deep water fishes are adaptation majorly for mating. (iii) Cold water can be defined as water whose annual temperature ranges from 1 to 5°C. (iv) Backwaters are water bodies that are partially connected with river system and partially closed from the sea. • (0) Constructions and human activities are allowed in CRZ-II. 2. Write an essay on coral reefs. Explain their formation, structure, fauna and the impact of climate change. 12 3. (a) Compare the physical and biological characteristics of freshwater and .. marine ecosystems. 6 (b) Adaptations of organisms in intertidal zones. 6 4. (a) Discuss the various challenges in maintaining sustainable aquatic environment. - 6 (b) Briefly explain the classification of lakes based on origin. 6 5. (a) Discuss in detail the physico-chemical characteristies of lake ecosystems and how they influence aquatic life. 7 (b) Explain the various morphological adaptations of hill streams. 5 (a) i Discuss the Jeffects of nitrate levels i water on fish health and 7, Write short notes on any a,farce of the following. : G.) Minor calp apecies -(fz`) oil spin (z.£.i) Interti.dal zone (I.I;) Ornamental.fishes.