WBCS(Main)-2002 Botany Paper- I Question Paper

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                                         W.B Civil Service Examination (Main)- 2002

                                                            (Optional Papers)

                                                              Botany Paper-I

 

Time Allowed-3 Hours                                                                                     Full Marks-100

  

                                                                Group - A

                                                    Answer any three questions

 

1.  (a) What is Necrosis ?   Give the scientific name of the organism which is responsible for the disease "Late blight of Potato".  What are the symptoms observed ?  State the methods of control       1+1+5+5=12

     (b)  What is Mycotoxin ?   Mention the sources and harmful effects of two mycotoxins.       2+2+2 = 6

    (c)  What do you mean by mycoses ?   Give an example.      1+1=2

 

2.  (a) What do you understand by Host-defense ?   Discuss, the biochemical lines of defense in plants against the pathogens.  What is disease mangement ?     2+8+4=14

    (b) Mention the sources and uses of Amylase citric acid and alcohol.     2+2+2=6

 

3.  (a) Distinguish between the following pairs (any four) :

          i)  Endemic and Epiphytotic disease

         ii)  Quarantine and Sanitation

         iii)  Satellite and Slow Virus

         iv)  Capsid and Capsomere

         v)  Non-persistent and Persistent Virus

        vi)  Gram + ve and Gram - ve bacteria.      4x4=16

   (b) What is Mycorrhiza ?  Name the types.of mycorrhiza. Mention two important functions of mycorrhiza.     1+1+2=4

 

4.   (a) Give an account of the thallus structure in the algae members you have studied.       14

     (b) Comment on the following structures (any two) :

          i)  Dwarf male of Oedogonium

         ii)  Cystocarp of Polysiphonia

       iii)  Pigments and reserve food meterials of Pheophyceae

        iv)  Two industrial uses of Lichen.     3x2 = 6

 

5.  (a)  Give an account of the sporophytes of Bryophytes you have studied, and point out the line of advancement.       12

     (b)  What is heterospory ?  Name one heterosporous pteridophyte. Point out the differences between haplo and actino stele, Ectophloic and amphiphloic-Siphonostele of Pteridophytes.      1+1+3+3=8

 

                                                                Group-B

                                                    Answer any two questions.

 

6.  (a)  State briefly why Gnetum is considered as  most advanced among Gymnosperms.      8

     (b)  What is gametogenesis ?  Write in short the development of female gametophyte in angiosperm.      1+8 = 9

    (c)  Write short notes on (any one):

           i) Coralloid root, 

          ii) Polyembryony.    3x1=3

 

7.  (a) Give the characteristic features of the following (any two) :

           i) Principles of a phyllogenetic system of classification,

          ii) Contorted, Quincuncial and Vexillary type of aestivation,

         iii) Caducons and accroscent Calyn.     3x2=6

    (b)  Point out the distinguishing characters of (any two):

          i) Flower of Pea,

         ii) Fruit of Ficus,

         iii) Seed of Castor,

         iv) Inflorescence of Sunflower.     3x2=6

    (c)  State the contrivances for cross-pollination.       8

 

8.  (a) Distinguish between the following families (any two):

          i) Apocynaceae and Asclepiadaceae,

          ii) Solanaceae and Acanthaceae,

          iii) Gramineae and Cyperaceae.     5x2=10

      (b)   Name the families to which the following plants belong. Mention their economic importance (any three): Coconut, Jute, Mango, Cotton.     3x3=9

       (c)  What do you mean by binomial nomenclature ?     1

***

 

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