WBCS(Main)-2002 Zoology Paper-II Question Paper

                                                WEST   BENGAL   CIVIL  SERVICE 

                                                           EXAMINATION - 2002

                                                                Zoology Paper-II


Time Allowed-3 Hours                                                                                        Full Marks-100 


                                                                     Group - A 

                                                        (Answer any four questions.)


1.  Describe the ultrastructure and functions of mitochondria.    12+4 


2.  What is endotherms ?  Give idea on the heat production in the body.  Compare ectothermy and endothcrmy.    3+9+4


3.  What is speciatibn ?  Describe the process of speciation, in brief, taking example of any bistope ?     3+13


4.  Describe the sequential events in the process of fertilization in brief.  What is its significance?    12+4


5.  How does ammonia form in the body ?  Give idea in brief the metabolism of ammonia with reference to ureotelic, ammonotelic and uricotelic organisms.     2+4+5+5


6.  (a)  Give an account of the steps of initiation of DNA replication in an eukaryote. Name the enzymes involved in each step. What is the base sequence characteristic of initiation region ?      3+2+2

     (b)  Give idea about the PCR.     4

     (c)  In recombinant DNA studies, what is the role of restriction endo-nuclease, terminal transferase, vectors, host cells, and calcium chloride.     5


7.  Write notes on any four of the following ;

    (a) Foetal membrane in chick

    (b) Type concept

    (c) Mimicry

    (d) Hardy-Weinberg equilibrium

    (e) DNA as a genetic material

    (f) Mechanism of image formation in ommatidium.    4x4



                                                               Answer any four questions,


8.  What are difference between phenetic and cladistic concept in systematies ?  What are the weaknesses of the purely phenetic method ?      8+8


9.  What is osmoregulation ?  Describe the process of osmoregulation in protozoans and annclidas.    6+10


10.  Distinguish between sex determination and sez differentiation. Give idea on the sex determination methods in Drosophilasp.    4+12