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

12th Standard

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Biology

Time : 02:00:00 Hrs
Total Marks : 100

    Part A

    50 x 2 = 100
  1. Name an organism where cell division is itself a mode of reproduction.

  2. What are exogenous buds?

  3. What is paedogenesis?

  4. Repeated fission is a type of multiple fission. Yes or No? Why?

  5. Name the types of cells found in seminiferous tubule.

  6. What is azospermia?

  7. What are the components that make up external genitalia female?

  8. Correct the following statements
    a) Transfer of an ovum collected from donor into the fallopian tube is called ZIFT.
    b) Transfering of an embryo with more than 8 blastomeres into uterus is called GIFT.
    c) Multiload 375 is a hormone releasing IUD.

  9. What is the purpose of barrier method of contraception?

  10. Point out any four STD's caused by viruses

  11. Name the discoverers of antigen A, B, and AB.

  12. What is the phenotype of (a) IAlO (b) 1O1O

  13. Name the parts marked ‘A’ and ‘B’ in the given transcription unit:

  14. What is genophore?

  15. Name the various types of prokaryotic DNA polymerase. State their role in replication process.

  16. What are UTR's?

  17. Explain how mutations, natural selection and genetic drift affect Hardy Weinberg equilibrium.

  18. What are actual remains?

  19. Atavistic organs - comment.

  20. Mention any two differences between Homo habilis and Homo erectus

  21. What are interferons? Mention their role.

  22. Name two RNA viruses which cause diseases in humans.

  23. Differentiate between infectious and non-infections disease.

  24. What causes shivering in malarial patient?

  25. Name the Agranulocytes involved in immune response

  26. Name the antibody responsible for allergic reaction. Also, mention two chemicals released during allergic response.

  27. How are antibiotics classified?

  28. What are the aims of National River conservation plan (NRCP)?

  29. Give reason. (a) Flavour in Yogurt (b) Large holes in Swiss Cheese

  30. Expand and define BOD

  31. How is the amplification of a gene sample of interest carried out using PCR?

  32. What is significance oflactalbumin?

  33. Comment on SCID

  34. What is Zero Stress?

  35. StateIordon's rule.

  36. What is Q10 value? How it is calculated?

  37. ‘Red data book’-What do you know about it?

  38. What is ecosystem/community diversity?

  39. What doesIUCN stand for?

  40. Name two major International environmental conventions.

  41. Define the term eutrophication.

  42. Differentiate Grafting and Layering.

  43. Point out the advantages of natural vegetative reproduction

  44. What is Nucellus

  45. How self-pollination is avoided in Abutilon?

  46. Coconut is an albuminous seed. Why?

  47. If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
    i) What type of linkage is seen?
    ii) Draw the cross with correct genotype.
    iii) What is the possible genotype in F2 generation?

  48. Write the various steps involved in cell suspension culture.

  49. Discuss the gross primary productivity is more efficient than net primary productivity.

  50. Name the humors that are responsible for the health of human beings.

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