WBCS(Main)-2003 Zoology Paper-I Question Paper

                                                WEST   BENGAL   CIVIL  SERVICE 

                                                           EXAMINATION - 2003

                                                                Zoology Paper-I


Time Allowed-3 Hours                                                                                        Full Marks-100 

                                                                       Group - A 

                                                        (Answer any three questions.)


1.  What is the difference between taeniasis and cysticercosis ?  Describe the developing stages of the parasite that causes these diseases.    5+15=20


2.  Describe in brief the structural parts of the typically echinoderm ambulacral system with a note on their functions. In what echinoderm this system is nonambulatory ?    12+5+3=20


3.  What are ‘Ratites’ and ‘Carinates’? Tabulate their important differences.     3+17=20


4.  Discuss the parental care of amphibians in respect of any three of the following modalities :

    (a)  selection of sites,

    (b)  formation of nests,

    (c)  Carrying eggs over the body,

    (d)  viviparity.    2+6+6+6=20


5.  Write brief notes on any four of the following :

    (a)  Syeonoid type or Leuconoid type of canal system

    (b)  Zoological importance of Peripatus

    (c)  Compound eyes of prawn

    (d)  Physostomous swim bladder

    (e)  Characteristic features of class Mammalia

    (f)  Axolotl larva and Bipinnaria larva

    (g)  Types of scales and caudal fins in fishes

    (h)  Book lungs and Nephrocytes in Arthropoda.    5x4=20



                                                          Answer any two questions.


6.  Describe in brief the biotic components of the ecosystem.  Explain how those components may combine to form food chain and food web.     10+5+5=20


7.  What is meant by environmental pollution ?  Explain primary and secondary pollutants of air indicating   their harmful effects on plants and animals.     3+13+4=20


8.  Elucidate the characteristics of social insects and name the Insects showing the most highly organised social life.     18+2=20


9.  Write brief noteson any four of the following :

    (a)  Biological clock

    (b)  Honey bees of Indja j-irtd their econ-omicvimportance

    (c)  Chi square (x2) test

    (d)  Lac Insects

    (e)  Composite fish culture

    (f)  Nerltic zone. Oceanic zone and Euphotic zone of the oceanic ecosystem

    (g)  Mutualism

    (h)  Integrated Pest Management.    5x4=20