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12th Standard Biology English Medium Reduced Syllabus Model Question paper with answer key - 2021 Part - 2

12th Standard

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Biology

Time : 02:45:00 Hrs
Total Marks : 70

      Part I

      Answer all the questions.

      Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.


    15 x 1 = 15
  1. Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Viviparous animals give better protection to their off springs.
    Reason: They lay their eggs in the safe places of the environment

    (a)

    If both A and R are true and R is correct explanation for A

    (b)

    If both A and R are true but R is not the correct explanation for A

    (c)

    If A is true but R is false

    (d)

    If both A and R are false

  2. Budding is seen in ______

    (a)

    Noctiluca

    (b)

    Amoeba

    (c)

    Nostoc

    (d)

    Planaria

  3. A few statements with regard to sexual reproduction are given below:
    i. Sexual reproduction does not always require two individuals
    ii. Sexual reproduction generally involves gametic fusion
    iii. Meiosis never occurs during sexual reproduction
    iv. External fertilization is a rule during sexual reproduction
    Choose the correct statements from the options below:

    (a)

    i and iv

    (b)

    i and ii

    (c)

    ii and iii

    (d)

    i and iv

  4. The male sex hormone testosterone is secreted from

    (a)

    Sertoli cells

    (b)

    Leydig cell

    (c)

    Epididymis

    (d)

    Prostate gland

  5. A – Ovulation is the release of ovum from the Graafian follicle.
    R – It occurs during the follicular phase of the menstrual cycle.

    (a)

    A and R are true, R is the correct explanation of A

    (b)

    A and R are true, R is not the correct explanation of A

    (c)

    A is true, R is false

    (d)

    Both A and R are false

  6. ABO blood group in man is controlled by

    (a)

    Multiple alleles

    (b)

    Lethal genes

    (c)

    Sex linked genes

    (d)

    Y-linked genes

  7. Co-dominant blood group is

    (a)

    A

    (b)

    AB

    (c)

    B

    (d)

    O

  8. Meselson and Stahl’s experiment proved

    (a)

    Transduction

    (b)

    Transformation

    (c)

    DNA is the genetic material

    (d)

    Semi-conservative nature of DNA replication

  9. Choose the correctly match pair.

    (a)

    Amphetamines - Stimulant

    (b)

    LSD - Narcotic

    (c)

    Heroin - Psychotropic

    (d)

    Benzodiazepine - Pain killer

  10. Vaccines that use components of a pathogenic organism rather than the whole organism are called

    (a)

    Subunit recombinant vaccines

    (b)

    attenuated recombinant vaccines

    (c)

    DNA vaccines

    (d)

    conventional vaccines

  11. Which among the following always decreases in a Food chain across tropic levels?

    (a)

    Number

    (b)

    Accumulated chemicals

    (c)

    Energy

    (d)

    Force

  12. Transmitting tissue is found in

    (a)

    Micropylar region of ovule

    (b)

    Pollen tube wall

    (c)

    Stylar region of gynoecium

    (d)

    Integument

  13. Genetic engineering is

    (a)

    making artificial genes.

    (b)

    hybridization of DNA of one organism to that of the others.

    (c)

    production of alcohol by using micro organisms.

    (d)

    making artificial limbs, diagnostic instruments such as ECG, EEG etc.,

  14. Strong, sharp spines that get attached to animal’s feet are found in the fruits of

    (a)

    Argemone

    (b)

    Ecballium

    (c)

    Heritier

    (d)

    Crossandra

  15. Match Column I with Column II
    Column I Column II
    i) William S. Gaud I) Heterosis
    ii) Shull II) Mutation breeding
    iii) Cotton Mather III) Green revolution
    iv) Muller and Stadler IV) Natural hybridization

    (a)

    i – I, ii – II, iii – III, iv – IV

    (b)

    i – III, ii – I, iii – IV, iv – II

    (c)

    i – IV, ii – II, iii – I, iv – IV

    (d)

    i – II, ii – IV, iii – III, iv – I

    1. Part II

      Answer any 6 questions. Question no. 21 is compulsory.


    6 x 2 = 12
  16. What is zymology?

  17. What is the significance of world biofuel day?

  18. Name the two viruses that acts as biocontrol agents.

  19. Name the various kinds of ELISA.

  20. Define alpine zone

  21. Define species extinction. What makes a species to become extinct?

    1. Part III

      Answer any 6 questions. Question no. 27 is compulsory.


    6 x 3 = 18
  22. Distinguish replication and transcription.

  23. How 5' of DNA differ from its 3'?

  24. Differentiate Sympatric speciation and Allopatric speciation.

  25. What are coprolites? Mention its role in phylogeny.

  26. Name the scientists who were awarded Nobel Prize in.1945 for discovering the penicillin drug & its role as an antibiotic.

  27. Functional Insulin differs from its pre-hormonal form. How?

    1. Part IV

      Answer all the questions.
    5 x 5 = 25
  28. Explain how mutation can impact genetic code with an example

  29. Write the characteristics of tundra.

  30. Enumerate the characters of anemophilous flowers

  31. Explain the procedure of Southern Blotting Technique. Southern Blotting Techniques - DNA

  32. Explain the stepwise preparation of Bio-pest repellent from the leaves of Azadirachta indica

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