OPSC OAS 2023: Main Examination, Advt. 17 of 2022-23, Paper I, Botany

4. Explain the process of double fertilization in angiosperms and its            Candidate
          significance.                                                          15      must not
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                                                                                       this margin.
          col

       5. Using appropriate examples, describe the utility of plants for the
          supply of `energy plantations' as substitutes of the sources of non-
          renewable energy.                                                      15
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       6. What is transduction? Explain the mechanism of transduction in
          bacterial cells.                                                       15

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          Q1116'lll QQ I




       7. Discuss in detail, the classification and distribution of gymnosperms
          in India.                                                               15

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       8. Explain the importance and role of plantibodies-mediated phyto
          immunology.                                                            15

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       9. Describe the ecological significance of algae, giving suitable
          examples. ElaboraLte upon algal associations in the ecosystem. 15
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          association 6)a6Q 6©16\ ®6i 6Q6l I

      10. Differentiate between cybrids and hybrids. Explain.
          cybrid <G`o hybrid q©o qtl6Q aieien ®'61? qaa I

      11. What are the primary mechanical tissues found in plants? Explain
          the anatomy of the major mechanical tissues and their mechanisms
          of formation.                                                          15
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          qQo 6qqSeQ 6ioG` g6iienq Qui6iHi QQ I

/98                                               2

12. How did bryophytes gradually evolve from aquatic algae? Explain           Candidate
          the transitional events.                                     15    must not
                                                                             whte on
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                                     GROUP-B


      13. Write a detailed note comparing the anatomy of C3 and C4 plants.
                                                                             20

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      14. What is a herbarium? What is the importance of maintaining
          herbarium for plant specimens? Explain the protocol for preparing
          Herbarium sheets.                                              20

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      15. Discuss in detail, the characteristic features of the Cucurbitaceae
          family.                                                             20

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          GiQ'




      16. What are lichens? Mention their various thallus types, modes of
          reproduction and ecological significance.                   20

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      17. How can plant sources be employed as sources of narcotics and
          insecticides? Use relevant examples to support your answer. 20

          Narcotics qer insecticides a ®eq6a ©aa Q©Q Qgq?G? a6aiao 6@iQai6iQ?
          aG`Q QQQ qag6Q 8iq@Q Gioi®6\6i aa I



/98                                             3                                      [ P.T.O.

18. Explain the process of somatic embryogenesis. What are its different    Candidate
       types? Discuss the significance and application of somatic               must not
       embryogenesis.                                                    20     whte on
                                                                              this margin.
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CSM-16/22                                 4                       PPP24/3(092)-182