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  • W.B.C.S Main 2001 Optional Question Paper Botany.
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    W.B.C.S Main 2001 Optional Question Paper Botany.

    W.B.C.S Main 2001 Optional Question Paper Botany – PAPER 1

    Group – A

    Answer any three questions

     

    I.  (a)  What are polygenes or nultiple factors ?  Give example.

    (b)  Explain why do you expect differences among cells arising from meiosis and not from mitosis,

    (c)  What are the genetic consequences of inversion ?

    (d)  How can you distinguish between haploidy and monoploidy ?       2

    (e)  Explain briefly the general properties of genetic code.       6

    (f)  Schematically represent the reverse flow of transcriptional information.      2

     

    2. (a)   Explain why do you consider mitochondria and chloriplasts as semi autonomous organelles      3

    (b)  Describe one experiment demonstrating DNA as a genetic material. Characterise the different forms of DNA.      4+3

    (c)  What are histones ?  How do the different histone molecules arrange specially in a nucleosome ?      1+3

    (d)  What are the achievements of gene transfer technology ?      4

    (e)  What is genomic library ?      2

     

    3.  (a) What role can mutations play in evolution ?      3

    (b) What is Neo-Darwinism ?      3

    (c) What is base substitution ?  Give example.      3

    (d) How enzymatic reactions are influenced by substrate concentration ?   What is enzyme inhibition ?      6+2

    (e) How do Gibberllins induce seed germination ?      3

     

    4.  (a)  What is oxidative phosphorylation ?     3

    (b)  Give a balance sheet for yield of  ATP during oxidative phosphorylation in mitochondria.

    (c)  Indicate when the RQ values become Zero, less than unity and infinity.     3

    (d)  Name two non symbiotic Nitrogen fixers.     2

    (e)  Characterise the nitrogenase enzyme complex.      4

    (f)  Why Boron is considered as an important micronutrient in plants ?      4

     

    5. (a)  How does Osmosis play significant role in plant life ?      3

    (b)  What are antitranspirants ?  What essential features would you suggest for an ideal antitranspirant ?      1+2

    (c)  Explain the Emerson enhancement effect.      4

    (d)  Briefly describe the anatomical characteristics of C4 plants.      3

    (e)  State the biosynthetic pathway of ethylene.     4

    (f)  Explain the phenomenon of vernalization.     3

     

    Group-B

    Answer any two questions.

     

    6.  (a)  How do the biotic factors influence vegetation of a particular area ?      6

    (b)  Describe briefly the structural adaptive features in

    (i) epiphytes  (ii) desert plants  (iii) mangroves.      3+3+3

    (c)  Compare the flora of eastern Himalaya with that of western Himalaya.     3

    (d)  What is a climax forest ?      2

     

    7.  (a)  Give the botanical names with their respective families, parts used and economic importance of the following :

    (i) Sunn hemp   (ii) Teak    (iii) Kurchi     (iv) Fan palm.      4 x 4

    (b)  Mention the ideal climatic and edaphic conditions for tea or jute cultivation.

     

    8.  Write shor notes on any five and their significance.

    (a)  Green house gases and their significance.

    (b)  The Quadrat method of studying vegetation.

    (c)  Biopollutants.

    (d)  Factors responsible for endemism.

    (e)  Spice yieldig plants of India.

    (f)  Silviculture.      4 x 5

    W.B.C.S Main 2001 Optional Question Paper Botany – PAPER 2

    Group – A

    Answer any three questions

     

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

    (a)  Endospore of bacteria

    (b)  Auxospore

    (c)  Ascocarp

    (d)  Sporophyle of Funaria

    (c)  Strobilus of Selaginella

    (f)   Legenosloma      5 x 4

     

    2.  (a)  Draw and describe the steps of lytic cycle of a bacteriophage.  What is lysogeny ?      8+2

    (b)  Give an account of the symptoms and control measures of the disease “Brown spot of Rice”.    5+5

     

    3.  Comment on the following : (any four)

    (a)  Economic uses of cyanophyceae

    (b)  Anatoxin

    (c)  Sphacelial stage of Ciaviceps

    (d)  Characteristic features’of Hepaticopsida Anatomy of stem of Equisetum Coralloid root of Cycas.

     

    4.  Distinguish between any four four of the following :    5 x 4

    (a)  Sporophyle of Riccia and Marchantia

    (b)  Eusporangium aiu! leptosporangiuin

    (c)  Wood of Cvca.s and  Piiuis

    (d)  Ovule and coal ball

    (e)  Coal and coal ball

    (f)  Stem anatomy of lycopodium clavatum and  L. cemum.        5 x 4

     

    5.  Characterise Peridophyta.   Discuss about the recent concept of origin of peridophyta.

     

    Group-B

    Answer any two questions.

     

    6.  Distinguish between any five pairs suitable examples :

    (a)  Androphoie and Gynophore

    (b)  Achene and follicle

    (c)  Diplostemony and obdiplostemony

    (d)  Synandrous and Syngenesius stamen

    (e)  Verticillaster and Cyathium inflorescence

    (f)  Ancmophily and zoophily

    (g)  Marginal and parietal plaecniation       4 x 5

     

    7.  (a) Characterise Leguminosae (Not the sub families).  Draw the floral diagram and point out the significant differences in die flowers of Papilionaceae and Caesalpiniaceae.   Give the scientific names of three economic plants taking or from each subfamilies yielding different products of commercial value.

    (b) Write a brief note on herbarium and its importance name India’s biggest herbarium.

     

    8.   (a)  Characterise solanaceae and mention about the vegetale yielding plants of tlie family.

    (b)  Characterise Ateraceae (compositae) and state why the family is regarded as highly advanced.

     

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