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12th Standard English Medium Biology Reduced Syllabus Three mark Important Questions with Answer key - 2021(Public Exam )

12th Standard

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Biology

Time : 02:00:00 Hrs
Total Marks : 75

    Part A

    25 x 3 = 75
  1. Differentiate foeticide and infanticide

  2. Who disproved Lamarck’s Theory of acquired characters? How?

  3. What are DNA vaccines?

  4. Why do we find a decrease in biodiversity distribution, if we move from the tropics towards the poles?

  5. Write a brief note on Habitat fragmentation.

  6. Mention ways of controlling depletion of ozone layer

  7. Write a brief note on Chipko movement.

  8. Define the term Diplospory

  9. Give a brief account on pollination process in Zea mays.

  10. Cleistogamous flower and chasmogamous flower. In which type does the autogamy is certain? why?

  11. Write a short note on Atavism.

  12. How crossing over differs from linkage?

  13. What is frame shift mutation?

  14. Is their any possibilities to transfer a suitable desirable gene to host plant without vector? Justify your answer.

  15. Explain the procedure behind the naming of Restriction Enzymes by citing an example.

  16. Comment on Golden rice.

  17. What are the optimal conditions that favours the induction of callus from nutrient medium?

  18. Comment on Biosafety.

  19. What are the adverse effects of temperature on plant?

  20. Point out the Anatomical adaptations exhibited by the Halophytes.

  21. Write a brief note on Detritus food chain.

  22. Nutrients are retained in the ecosystem. Discuss how and name the process through which it is achieved?

  23. Prosopis juliflora, though an alien invasive species to India, it is beneficial to certain extent. Give reason.

  24. Mention any three advantages of Arbuscular mycorrhizal association.

  25. Write a note on origin and area of cultivation of cotton.

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