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Important 3 Mark Book Back Questions (New Syllabus) 2020

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 72

    Part A

    24 x 3 = 72
  1. The unicellular organisms which reproduce by binary fission are considered immortal. Justify

  2. What is the composition of semen?

  3. Give a schematic representation of spermatogenesis and oogenesis in humans.

  4. What are the strategies to be implemented in India to attain total reproductive health?

  5. Explain the genetic basis of ABO blood grouping man.

  6. Why tRNA is called an adapter molecule?

  7. How does Mutation theory of De Vries differ from Lamarck and Darwin’s view in the origin of new species.

  8. What are the cells involved innate immune system.

  9. Write the key features of organic farming.

  10. What are DNA vaccines?

  11. What are the ways by which organisms respond to abiotic factors?

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

  13. Mention the causes of enhanced use of ultraviolet radiation

  14. Define the term Diplospory

  15. Explain the law of dominance in monohybrid cross.

  16. Explain the mechanism of crossing over.

  17. What are restriction enzyme. Mention their type with role in Biotechnology.

  18. Explain the basic concepts involved in plant tissue culture

  19. Mention any two significant roles of predation plays in nature.

  20. Name of the food chain which is generally present in all type of ecosystem. Explain and write their significance.

  21. How do sacred groves help in the conservation of biodiversity?

  22. Explain the best suited type followed by plant breeders at present?

  23. If a person drinks a cup of coffee daily it will help him for his health. Is this correct? If it is correct, list out the benefits.

  24. Differentiate between:
    Autoimmune disease and Immunodeficiency disease

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