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12th Standard English Medium Biology Reduced Syllabus Three mark Important Questions - 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. Give reasons for the following:
    (a) Some organisms like honey bees are called parthenogenetic animals
    (b) A male honey bee has 16 chromosomes where as its female has 32 chromosomes

  2. What is strobilation?

  3. Explain briefly on the nature of Ovovivipary.

  4. What is LH surge?

  5. Name the absorbents or materials used to manage menstruation.

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

  7. Write the hormonal composition of oral contraceptive pills. Also, explain their action mode

  8. Explain male heterogamety

  9. What is euthenics?

  10. What are the three structural differences between RNA and DNA?

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

  12. What are the cells involved innate immune system.

  13. Explain the role of cry-genes in genetically modified crops.

  14. What are stem cells? Explain its role in the field of medicine

  15. Differentiate Natality and Mortality

  16. Where are biodiversity hotspots normally located? Why?

  17. How can we control eutrophication?

  18. “The endosperm of angiosperm is different from gymnosperm”. Do you agree. Justify your answer.

  19. Differentiate incomplete dominance and codominance.


  20. From the above figure identify the type of mutation and explain it.

  21. Explain the basic concepts involved in plant tissue culture

  22. How does an orchid ophrys ensures its pollination by bees ?

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

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

  25. What are millets? What are its types? Give example for each type.

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