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12th Standard Biology Revision Model Question Paper With Answer Key

12th Standard

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Biology

Time : 02:30:00 Hrs
Total Marks : 70

    PART-I


    Note : i ) All Questions Are Compulsory

     

              ii) Choose The Most Suitable Answer From The Given Four Correct Alternatives


    15 x 1 = 15
  1. The mode of sexual reproduction in bacteria is by ______.

    (a)

    Formation of gametes

    (b)

    Endospore formation

    (c)

    Conjugation

    (d)

    Zoospore formation

  2. The foetal membrane that forms the basis of the umbilical cord is _____.

    (a)

    Allantois

    (b)

    Amnion

    (c)

    Chorion

    (d)

    Yolk sac

  3. Which of the following statements about DNA replication is not correct?

    (a)

    Unwinding of DNA molecule occurs as hydrogen bonds break.

    (b)

    Replication occurs as each base is paired with another exactly like it

    (c)

    Process is known as semi conservative replication because one old strand is conserved in the new molecule.

    (d)

    Complementary base pairs are held together with hydrogen bonds

  4. B cells that produce and release large amounts of antibody are called

    (a)

    Memory cells

    (b)

    Basophils

    (c)

    Plasma cells

    (d)

    killer cells

  5. Cyclosporin – A is an immunosuppressive drug produced from _______

    (a)

    Aspergillus niger

    (b)

    Manascus purpureus

    (c)

    Penicillium notatum

    (d)

    Trichoderma polysporum

  6. Which of the following is an r-species

    (a)

    Human

    (b)

    Insects

    (c)

    Rhinoceros

    (d)

    Whale

  7. Right to Clean Water is a fundamental right, under the Indian Constitution

    (a)

    Article 12

    (b)

    Article 21

    (c)

    Article 31

    (d)

    Article 41

  8. Match the following

    I) External fertilization i) pollen grain
    II) Androecium ii) anther wall
    III) Male gametophyte iii) algae
    IV) Primary parietal layer iv) stamens
    (a)
    II III IV
    iv i ii iii
    (b)
    II III IV
    iii iv i ii
    (c)
    II III IV
    iii iv ii i
    (d)
    II III IV
    iii i iv ii
  9. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

    (a)

    9:1

    (b)

    1:3

    (c)

    3:1

    (d)

    50:50

  10. Restriction enzymes are _____.

    (a)

    Not always required in genetic engineering

    (b)

    Essential tools in genetic engineering

    (c)

    Nucleases that cleave DNA at specific sites

    (d)

    both b and c

  11. Ecology is the study of an individual species is called
    i) Community ecology
    ii) Autecology
    iii) Species ecology
    iv) Synecology

    (a)

     i only

    (b)

    ii only 

    (c)

     i and iv only

    (d)

    ii and iii only

  12. Which of the following ecosystem has the highest primary productivity?

    (a)

    Pond ecosystem

    (b)

    Lake ecosystem

    (c)

    Grassland ecosystem

    (d)

    Forest ecosystem

  13. The plants which are grown in silivpasture system are ______.

    (a)

    Sesbania and Acacia

    (b)

    Solenum and Crotalaria

    (c)

    Clitoria and Begonia

    (d)

    Teak and sandal

  14. Colostrum provides

    (a)

    Naturally acquired active immunity

    (b)

    Naturally acquired passive immunity

    (c)

    Artificially acquired active immunity

    (d)

    Artificially acquired passive immunity

  15. ______ is not a feature of acquired immunity.

    (a)

    diversity

    (b)

    recognitionof self

    (c)

    non-specific

    (d)

    memory

  16. PART-II


    Note : i ) Answer any six questions and question number 24 in compulsory.


    6 x 2 = 12
  17. At what stage of development are the gametes formed in new born male and female?

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

  19. PCR is a useful tool for early diagnosis of an Infectious disease. Elaborate

  20. What is reproduction?

  21. What is the difference between missense and nonsense mutation?

  22. What is the name of the process given below? Write its 4 types.

  23. Give correct answers for the given questions below.

    a. Identify the vegetative propagules
    b: Label the part
    c. Can offspring produced be considered as clone?
    d. Write as the binomial of the above.

  24. Who rediscovered Mendel's results on the inheritance of characters?

  25. Given below are the secondary metabolites. Mention their plant source.
    (a) Digoxin
    (b) Vincristine.

  26. PART-III


    Note : i ) Answer any six questions and question number 24 in compulsory.


    6 x 3 = 18
  27. The unicellular organisms which reproduce by binary fission are considered immortal. Justify

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

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

    (Barriers, Lactational amenorrhoea, CuT, Tubectomy)

  30. Differentiate between Tundra and Taiga Biomes.

  31. Write the advantages and disadvantages of Bt cotton.

  32. Differentiate between:
    Autoimmune disease and Immunodeficiency disease


  33. (i) Identify the Process
    (ii) Name the Organism

  34. Give the alternate terminologies for
    (a) Spermatogonia
    (b) Embryonic ectoderm

  35. Complete the table by filling the gaps.

    Disease Causative agent Symptoms
    Gonnorrhea A Affects urethra & cervix, painful urination
    B Human Immuno Virus Enlarged lymph node, night sweat, weight
    reduction
    Hepatitis Hepatitis-B- Virus C
  36. PART-IV


    Note : i ) Write all the following questions.


    5 x 5 = 25
    1. The following is the illustration of the sequence of ovarian events (a-i) in a human female.

      a) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
      b) Name the ovarian hormone and the pituitary hormone that have caused the above-mentioned events.
      c) Explain the changes that occurs in the uterus simultaneously in anticipation.
      d) Write the difference between C and H.

    2. a) Identify the figure given below
      b) Redraw the structure as a replicating fork and label the parts
      c) Write the source of energy for this replication and name the enzyme involved in this process.
      d) Mention the differences in the synthesis of protein, based on the polarity of the two template strands.

    1. Explain how “Rosie” is different from a normal cow

    2. Describe dominant epistasis with an example. 

    1. Write the protocol for artificial seed preparation.

    2. Write the economic importance of rice.

    1. Write a note a extra embryonic membranes.

    2. List out the causes of fertility in human.

    1. Discuss the genic balance mechanism of sex determination with reference to Drosophila.

    2. Write the salient features of Human Genome Project.

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