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

4. Draw neat and well-labelled diagrams wherever necessary. 1. (a) Define the following : (1x5=5) (ii) Exotic carp (iii) Fisheries (b) Differentiate between any five of the following: (2x5=10) (i) Osteichthyes and Chondrichthyes (ii) Gastric fish and Agastric fish (iii) Placoid and Cycloid scales (iv) Live bearers and egg layers (v) Monoculture and polyculture (vi) Physostomous and Physoclistous (c) Write the location and function of the following: (2x5=10) (ii) Swim bladder (iii) Gill arch (iv) Chloride cells (v) Caudal fin (d) Match the following Columns : (1x5=5) (i) Dipnoi a. Migratory fish (iii) Eel c. Sharks (iv) Coiling around the egg d. Lateral line (V) Heterocercal tail e. Parental care 2. (a) What is fish migration? Briefly explain the different type of migration of fishes with suitable examples. (b) Write the general morphological, physiological, and ecological characteristics of fishes. (5) 3. (a) Describe the various adaptations found in hill-stream fishes with the help of diagrams. (10) (b) Give a detailed account of parental care in fishes with suitable examples. (5) 4. (a) Describe the different types of scales found in fishes and draw well-labelled diagrams of each (b) What is a swim bladder? Describe its structure, functions, and significance in fishes. (5) 5. (a) Explain the cardiovascular physiology of fishes. Describe the structure of the fish heart and outline the pathway of blood circulation in the fish body. (10) (b) Describe in detail the structure of gill in fishes. 6. (a) What is induced breeding in fishes? Explain the techniques, hormones used, and advantages of induced breeding in aquaculture. (10) (b) Briefly describe the major adaptations in deep-sea fishes. (5) 7. Write the short notes on any three of the following: (a) Sensory system in fishes (b) Acid-base balance in fishes (c) Fish larval stages (d) Food and feeding habits of fishes