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1 No. of Printed Pages : 8 I LSE-09(S) BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2017 LIFE SCIENCE LSE-09(S) : ANIMAL DIVERSITY-I Time : 3 hours Maximum Marks : 75 Note : Question no. 1 is compulsory. Attempt any six questions from questions no. 2 to (a) Define the following terms : (i) Homeostasis (ii) Species (iii) Moulting (iv) Parthenogenesis (v) Deuterostome (b) Fill in the blanks (i) The environmental stimulus which entrains a biological clock is called (ii) is the ancestral class of molluscs. LSE-09(S) 1 P.T.O.

2 (iii) The presence of more than one structural type of individual is called (iv) Characteristic respiratory organ of insects is (v) Ctenophores show symmetry. (c) State whether true or false : 5 (i) (ii) (iii) (iv) (v) The infective stage of Entamoeba Histolytica is a four nucleate cyst. In pseudocoelomates the cavity between the ectoderm and endoderm is completely filled with mesoderm. Sponges with skeleton made up of spicules of calcium carbonate belong to the class Demospongiae. The body cavity of insects is called haemocoel. Lac is produced by an insect. 2. (a) With the help of neat, labelled diagrams, explain osmoregulation and excretion in Amoeba. 5 (b) Explain the asexual phase of the life cycle of Plasmodium vivax with the help of flow chart and diagrams. LSE-09(S) 2

3 3. (a) What type of mouth parts does the cockroach possess? With the help of neat, labelled diagrams, describe the mouth parts of a cockroach. (b) What is the significance of asexual reproduction in non-chordates? Discuss the asexual reproduction in fresh water sponges (Spongilla). 4. Describe the various larval forms of phylum echinodermata with diagrams and examples (a) Give the names of two different types of non-mulberry silk produced in India. In which country was silk produced for the first time? 2+1=3 (b) Describe the life cycle of silkworm. Explain how silk is produced by it With the help of neat, labelled diagrams and flow chart, show the life cycle of Fasciola Hepatica. Add a note on the disease caused by it Give the general characteristics of the Phylum Annelida. Classify it upto class with suitable examples. Give one distinguishing characteristic of each class. 10 LSE-09(S) 3 P.T.O.

4 8. Write short notes on any two of the following : 2x5=10 (a) Hormonal Control of Metamorphosis (b) Coelom (c) Parasitic Adaptations in Nemathelminthes (d) Coral Reef LSE-09(S) 4

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8 8. PIHRirtsid 4 trt fdl-lipieft fo-rur : 2x5=10 () cpa 4 cnimickui rti ftir1ur (1w) (To 41:1-r tra1-41 0E0 maio LSE-09(S) 500

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