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12th Standard Biology English Medium Reduced Syllabus Important Questions - 2021 Part - 2

12th Standard

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Biology

Time : 02:45:00 Hrs
Total Marks : 165

    Multiple Choice Questions

    15 x 1 = 15
  1. The whole process of spermatogenesis takes about ______ days.

    (a)

    25

    (b)

    42

    (c)

    64

    (d)

    72

  2. Each testis is covered by a fibrous layer _____

    (a)

    tubulus rectus

    (b)

    corona radiata

    (c)

    vitelline membrane

    (d)

    tunica albuginea

  3. In the year ______    india is expected to become the largest country in population size ______

    (a)

    2021

    (b)

    2025

    (c)

    2022

    (d)

    2030

  4. Expansion of the RCH is _____

    (a)

    Reproduction and Children Health Programme

    (b)

    Reproductive arid Child's Health Committee

    (c)

    Reproduction and Critical Health Care

    (d)

    Reproductive and Child Health Care

  5. PCR proceeds in three distinct steps governed by temperature, they are in order of

    (a)

    Denaturation, Annealing, Synthesis

    (b)

    Synthesis, Annealing, Denaturation

    (c)

    Annealing, Synthesis, Denaturation

    (d)

    Denaturation, Synthesis, Annealing

  6. Gene which suppresses other genes activity but does not lie on the same locus is called as

    (a)

    Epistatic

    (b)

    Supplement only

    (c)

    Hypostatic

    (d)

    Codominant

  7. If haploid number in a cell is 18. The double monosomic and trisomic number will be

    (a)

    35 and 37

    (b)

    34 and 37

    (c)

    37 and 35

    (d)

    17 and 19

  8. Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.
    Reason (R): Because they carry lower energy to non-ionize electrons from atom

    (a)

    A is correct. R is correct explanation of A

    (b)

    A is correct. R is not correct explanation of A

    (c)

    A is correct. R is wrong explanation of A

    (d)

    A and R is wrong

  9. Some of the characteristics of Bt cotton are

    (a)

    Long fibre and resistant to aphids

    (b)

    Medium yield, long fibre and resistant to beetle pests

    (c)

    high yield and production of toxic protein crystals which kill dipteran pests.

    (d)

    High yield and resistant to ball worms

  10. The time duration for sterilization process by using autoclave is ______ minutes and the temperature is _______

    (a)

    10 to 30 minutes and 125° C

    (b)

    15 to 30 minutes and 121° C

    (c)

    15 to 20 minutes and 125° C

    (d)

    10 to 20 minutes and 121° C

  11. Cryopreservation means it is a process to preserve plant cells, tissues or organs

    (a)

    at very low temperature by using ether.

    (b)

    at very high temperature by using liquid nitrogen

    (c)

    at very low temperature of -196 by using liquid nitrogen

    (d)

    at very low temperature by using liquid nitrogen

  12. In soil water available for plants is

    (a)

    gravitational water

    (b)

    chemically bound water

    (c)

    capillary water

    (d)

    hygroscopic water

  13. Which of the following is / are not a natural ecosystem?

    (a)

    Forest ecosystem

    (b)

    Rice field

    (c)

    Grassland ecosystem

    (d)

    Desert ecosystem

  14. People’s movement for the protection of environment in Sirsi of Karnataka is

    (a)

    Chipko movement

    (b)

    Amirtha Devi Bishwas movement

    (c)

    Appiko movement

    (d)

    None of the above

  15. The quickest method of plant breeding is

    (a)

    Introduction

    (b)

    Selection

    (c)

    Hybridization

    (d)

    Mutation breeding

  16. 2 Marks

    15 x 2 = 30
  17. Define Vivipary.

  18. What is colostrum? Write its significance.

  19. What is the function of seminal fluid?

  20. What is criss-cross inheritance?

  21. State any three goals of the human genome project.

  22. What are interferons? Mention their role.

  23. What is biological oxygen demand?

  24. What are the three levels of biodiversity?

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

  26. List out two sub-aerial stem modifications with example.

  27. You are working in a biotechnology lab with a becterium namely E.coli. How will you cut the nucleotide sequence? explain it.

  28. ‘Green algae are not likely to be found in the deepest strata of the ocean’. Give at least one reason.

  29. Soil formation can be initiated by biological organisms. Explain how?

  30. Discuss which wood is better for making furniture.

  31. Give definitions for organic farming?

  32. 3 Marks

    15 x 3 = 45
  33. What is strobilation?


  34. (i) Identify the animal
    (ii) What is significant about the animal.

  35. 'A' and 'B' are the male & female sex cells respectively which look alike and performs similar functions. 'A' and 'B' fuse to form a new individual 'D'. Which type of gametic fusion does this represent? Give an example

  36. What are Braxter-Hick's contractions?

  37. Give an account on uterine wall layers.

  38. Expand the following
    a) ZIFT
    b) ICSI

  39. Name the anticodon required to recognize the following codons: AAU, CGA, UAU, and GCA.

  40. Justify the role of microbes as a bio-fertilizer

  41. Differentiate J and S shaped curve

  42. Compare and Contrast the insitu and exsitu conservation.

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

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

  45. How will you identify a vectors?

  46. Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

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

  48. 5 Marks

    15 x 5 = 75
  49. Given an account on following terms.
    (a) Hologamy
    (b) Isogamy
    (c) Anisogamy
    (d) Merogamy
    (e) Paedogamy

  50. Explain about breast self Examination and Early diagnosis of Cancer.

  51. What are IUD's? Explain its way of functioning. Also describe their types.

  52. List the salient features of genetic code.

  53. How does Neanderthal man differ from the modern man in appearance?

  54. Explain about the objections to Darwinism.

  55. What are recombinant vaccines?. Explain the types

  56. In north eastern states, the jhum culture is a major threat to biodiversity – substantiate.

  57. Write a note on
    i) Protected areas,
    ii) Wild life sanctuaries,
    iii) WWF.

  58. Enumerate the characteristic features of Entomophilous flowers

  59. With a suitable diagram explain the structure of an ovule.

  60. Give an account of various types of parasitism with examples.

  61. List out any five morphological adaptations of halophytes.

  62. List out the new breeding techniques involved in developing new traits in plant breeding.

  63. What are psychoactive drugs? Add a note Marijuana and Opium

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