Download SGBAU BSc 2019 Summer 3rd Sem Zoology Life n Diversity Of Chordata n Concept Of Evolution Question Paper

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B.Sc. Part-II (Semester-III) Examination

ZOOLOGY

(Life and Diversity of Chordata and Concept of Evolution)

Note :— (1) ALL questions are compulsory.

(2) Question No. 1 carries 8 marks and remaining SIX questions carry 12 marks each.

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(3) Illustrate your answer with suitable diagrams wherever necessary.

1. (A) Fill in the blanks : 2
   1. Amphioxus is commonly known as __________
   2. Sweat and sebaceous glands are found in the skin of class __________
   3. The connecting link between annelida and arthropoda is __________
   4. The Rana tigrina is commonly called as __________

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   (B) Choose the correct alternative from the following : 2
   1. __________ is a cartilaginous fish.
      • (a) Catla
      • (b) Labeo
      • (c) Cyprinus
      • (d) Scoliodon

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   2. Coiling around eggs to guard them is found in __________
      • (a) Echidna
      • (b) Ichthyophis
      • (c) Salamander
      • (d) Calotes

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   3. The mammalian kidney is __________
      • (a) Protonephric
      • (b) Mesonephric
      • (c) Metanephric
      • (d) None of these

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   4. Homo erectus evolved in __________
      • (a) Asia
      • (b) Europe
      • (c) Africa
      • (d) Australia

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   (C) Answer in ONE sentence each 4
   1. What is gene flow ?
   2. How many chambers are present in mammalian heart ?
   3. Name of the additional chambers of Scoliodon heart.
   4. Sound producing organ of birds.

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2. Give an account of respiratory system of Scoliodon with its mechanism. 12

   OR

   Describe the digestive system of Amphioxus
3. Explain the following 12
   1. External features of Rana tigrina.
   2. Internal structure of heart of frog. (Only labelled diagram).
   3. Urinogenital system of female calotes

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   OR

   1. Parental care in anura
   2. Internal structure of heart of calotes. (Only labelled diagram)
   3. Snake venom

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4. Describe the migration in birds 12

   OR

   Describe the salient features of Prototheria.
5. Explain the following : 12
   1. Embryological evidences of evolution
   2. Petrified fossils
   3. Peripatus as connecting link

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   OR

   1. Anatomical evidences of evolution
   2. Importance of fossils records
   3. Radioactive carbon dating of fossils.

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6. Describe the following : 12
   1. Gene frequency
   2. Sympatric speciation
   3. Hardy Weinberg equilibrium

   OR

   1. Genetic drift

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   2. Natural selection
   3. Convergent evolution.
7. Attempt the following : 12
   1. Ramapithecus
   2. Aortic arches in fish

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   3. Desert adaptation

   OR

   1. Dryopithecus
   2. Neanderthal man
   3. Terrestrial adaptation.

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