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12th Standard Biology Important 3 Mark Questions

12th Standard

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Biology

Time : 01:30:00 Hrs
Total Marks : 60

    Answer all the following questions.

    30 x 3 = 90
  1. Which type of reproduction is effective -Asexual or sexual and why?

  2. Identify the given image and label its parts marked as a, b, c and d

  3. Select the correct term from the bracket and complete the given branching tree

    (Barriers, Lactational amenorrhoea, CuT, Tubectomy)

  4. Explain the mode of sex determination in honeybees.

  5. Distinguish between structural gene, regulatory gene and operator gene

  6. How did Darwin explain fitness of organisms?

  7. (i) Write the scientific name of the filarial worm that causes filariasis.
    (ii) Write the symptoms of filariasis.
    (iii) How is this disease transmitted?

  8. How is milk converted into curd? Explain the process of curd formation

  9. What are transgenic animals? Give examples

  10. Differentiate between Tundra and Taiga Biomes.

  11. What are the factors that drive habitat loss?

  12. Write notes on the following:
    a. Eutrophication
    b. Algal Bloom

  13. “Endothecium is associated with dehiscence of anther” Justify the statement

  14. Differentiate incomplete dominance and codominance.

  15. Write the steps involved in molecular mechanism of DNA recombination with diagram.

  16. How will you identify a vector ?

  17. Give an account on Cryopreservation.

  18. What is co evolution?

  19. Construct the food chain with the following data.
    Hawk, plants, frog, snake, grasshopper.

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

  21. Enumerate the uses of turmeric

  22. Differentiate between:
    Humoral and CMI immunity

  23. Describe the different phases of life cycle in an organism.

  24. What are Braxter-Hick's contractions?

  25. What is GIFT?

  26. What is extra chromosomal or cytoplasmic, inheritance

  27. What is S-D Sequence?

  28. What are connecting links?

  29. Classify antigens based on origin.

  30. How does Delta-endotoxin affect insects?

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