WBCS(Main)-2001 Zoology Paper-I Question Paper

                                                WEST   BENGAL   CIVIL  SERVICE 

                                                           EXAMINATION - 2001

                                                                 Zoology Paper-I


Time Allowed-3 Hours                                                                                        Full Marks-100 


                                                                      Group - A 

                                                        (Answer any three questions.)


1.  How would you distinguish between a male and a female Ascaris ?  State briefly the life-cycle of Ascaris lumbricoided.  Add a note on its pathogenicity and control.     5+10+3+2 = 20


2.  What is reproduction ?  State different methods of reproduction in the following Protozoa.

    (a)  Amoeba Proteus

    (b) Euglena Viridis

    (c) Plasmodium Vivax

    (d) Paramoecium. Caudatum      4+4 X 4 = 20


3.  What is ciliary mode of feeding ?  Give an account of its mechanism in lower chordates.  Comment on its evoluitonarv significance.     2+15+3 = 20


4.  Distinguish between neotetvy and paedogenesis.  Describe the phenomenon of neotenv in Amphobia with suitable examples.  State the hormonal control of Neoteny.    4+10+6 = 20


5.  Write short notes on any four of the following :- 

    (a)  Ultrastructure of Cilia and flagella

    (b)  Coral and coral-reef formation,

    (c)  Torsion and detorsiort in Gastropoda,

    (d)  Trypanosomiasis,

    (e)  Exoskeletal structures in Pigeon.

    (f)  Ruminant stomach.

    (g)  Affinities of etenophora.

    (h)  biling Mechanism in Snakes.     5x4 = 20


                                                                        Group - B

                                                          Answer any two questions.


6.  What is ecosystem ?  Mention the main structural and functional components of an ecosystem.  What is food-chain ?  Explain with suitable examples the Grazing and Detritus food-chain in the ecosystem.   Define ecotone and edge-effect.      2 + 4 + 2 + 8 + 4 = 20


7.  Define pollution. Classify the pollutants responsible for Air-pollution.   Discuss briefly the various causes of Air-pollution.  State the effective measures for controlling air-pollution.     2 + 4 + 8 + 6 = 20


8.  (a)  What is silk ?  Mention its composition .     2 + 3

     (b)  Discuss the causative agents, symptoms and control, measures of the diseases of silk worm larvae.     10

     (c)  Comment on the application of bio-technology in the improvement of silk worm strains.     5


9.  Gvie brief idea about any four of the following:

    (a)  Circadian rhythm,

    (b)  Role of hormone in animal behaviour,

    (c)  Method of polyculture in India ,

    (d)  Major paddy pests .

    (e)  Chi-square and ‘t’ test,

    (f)  Prospect of Pearl Culture in India ,

    (g)  Bio-diversity ,

    (h)  Ozone -hole.    5 x 4 = 20