2022 ZOL 3B 03_31636_ANIMAL DIVERSITY -CHORDATA 1.pdf

6 293881 9 D 31636 (Pages : 2) Name............................................

6 293881 9 D 31636 (Pages : 2) Name......................................... Reg. No..................................... 3 THIRD SEMESTER (CUCBCSS—UG) DEGREE EXAMINATION NOVEMBER 2022 1 Zoology ZOL 3B 03—ANIMAL DIVERSITY : CHORDATA—I (2017—2018 Admissions) Time : Three Hours Maximum : 80 Marks Part A 6 I. One Word Questions. Answer all questions. Each question carries 1 mark : 1 Mention order to which Trygon belongs to. 2 Name an Aphibian exhibiting parental care. 9 3 Chimaera belongs to the order —————. 4 The venom of Naja is ————— type. 3 5 Mention the genus name of mackerel. 6 Ascidia exhibits ————— metamorphosis 1 7 The larva of Ambystoma is —————. 8 ————— is an ovoviviparous fish 9 The kidney of Calotes is ————— type. 10 ————— is an aquatic reptile. (10 × 1 = 10 marks) Part B 6 II. Short Answer Questions. Answer any ten questions. Each question carries 2 marks : 11 Write notes on life cycle of Doliulum. 9 12 Comment on the discovery of Nasikabatrachus sahyadrensis. 13 What is optic chiasma ? 3 14 Write down the adaptations of Sphenodon. 15 What are solenocytes ? Mention their function. 1 16 Distinguish between crocodiles and alligators. Turn over 293881  6 293881 9 2 D 31636 17 Write notes on air bladder of Mullet. 3 18 Comment on the taxonomic significance of Latimeria. 19 Write notes on ammocoetus larva. 1 20 What is retrogressive metamorphosis ? Give example. 21 Explain sexual dimorphism in frog. 22 Distinguish between lampreys and hag fishes. (10 × 2 = 20 marks) Part C III. Paragraph Questions. Answer any five questions. Each question carries 6 marks : 6 23 Explain the structure of gills of Mullet. 24 With the help of a diagram, describe the male reproductive system of Calotes. 9 25 Distinguish between Chondrichthyes and Osteichthyes. 26 Explain the diagnostic features of order Apoda. Write notes on any two examples from this 3 order. 27 Classify Phylum Chordata down to subphyla, giving salient features of each phylum. 1 28 Discuss the affinities of Branchiostoma. 29 Explain the structure of ear of frog. 30 Explain the diagnostic features of order Dipnoi. Cite examples and comment on their distribution. (5 × 6 = 30 marks) Part D 6 IV. Essay Questions. Answer any two questions. Each question carries 10 marks : 31 Describe the structure of the arterial system of frog with the help of a labeled diagram. 9 32 Explain the identification key for poisonous snakes of Kerala. 33 Classify Reptilia down to orders giving diagnostic features and citing examples. 34 Describe the structure of the brain of Mullet with the help of a labeled sketch. 3 (2 × 10 = 20 marks) 1 293881