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12th Standard English Medium Biology Reduced Syllabus Public Exam Model Question Paper with Answer key - 2021

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. Pick out the organism whose fertilization occurs internally

    (a)

    reptiles

    (b)

    sponges

    (c)

    pisces

    (d)

    amphibians

  2. Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

    (a)

    Gonorrhoea is a STD whereas others are not.

    (b)

    Trichomoniasis is a viral disease whereas others are bacterial.

    (c)

    HIV is a pathogen whereas others are diseases.

    (d)

    Hepatitis B is eradicated completely whereas others are not.

  3. _______is unique for DNA.

    (a)

    Adenine

    (b)

    Uracil

    (c)

    Guanine

    (d)

    Thymine

  4. The golden age of reptiles was

    (a)

    Mesozoic era

    (b)

    Cenozoic era

    (c)

    Paleozoic era

    (d)

    Proterozoic era

  5. Plants used for bio-diesel production________

    (a)

    Anabaena

    (b)

    Jatropha

    (c)

    Pongamia

    (d)

    b and c

  6. Which of the following is an r-species

    (a)

    Human

    (b)

    Insects

    (c)

    Rhinoceros

    (d)

    Whale

  7. Which of the following is a behavioural adaptation?

    (a)

    Thick fur

    (b)

    camouflage

    (c)

    Sharp canines

    (d)

    Migration

  8. Which of the following post fertilization change is incorrectly matched?

    (a)

    Secondary nucellus - Endosperms

    (b)

    Antipodals - Degenerates

    (c)

    Nucellus - Testa and tegma

    (d)

    Funicle - Seed stalk

  9. The point mutation sequence for transition, transition, transversion and transversion in DNA are

    (a)

    A to T, T to A, C to G and G to C

    (b)

    A to G, C to T, C to G and T to A

    (c)

    C to G, A to G, T to A and G to A

    (d)

    G to C, A to T, T to A and C to G

  10. Pick out the co-mutagen from the following:

    (a)

    Eosin

    (b)

    Mustard gas

    (c)

    Ascorbic acid

    (d)

    Nitrous acid

  11. The prevention of large scale loss of biological interity

    (a)

    Biopatent

    (b)

    Bioethics

    (c)

    Biosafety

    (d)

    Biofuel

  12. Statement 1: Latitudes represent distance from the equator.
    Statement 2: Height above the seal level from longitude.

    (a)

    Statement 1 is correct. Statement 2 is incorrect

    (b)

    Statement 1 is incorrect. Statement 2 is correct

    (c)

    Both the statements are correct.

    (d)

    Both the statements are incorrect

  13. Assertion (A): In forest ecosystem, the pyramid of number is spindle shaped.
    Reason (R): Tropical level (Tl) of the pyramid occupies large trees which are maxium in
    number.

    (a)

    Both A and R are wrong

    (b)

    A is right R is wrong

    (c)

    R explains A

    (d)

    A is right R is not the correct explanation for A

  14. Invasive species _______________

    (a)

    alter the soil system

    (b)

    are more adapted

    (c)

    are fast growing

    (d)

    all the above

  15. Assertion: Turmeric fights various kinds of cancer
    Reason: Curcumin is an anti-oxidant present in turmeric

    (a)

    Assertion is correct, Reason is wrong

    (b)

    Assertion is wrong, Reason is correct

    (c)

    Both are correct

    (d)

    Both are wrong

  16. Part II

    Answer any 6 of the questions. Question no.24 is compulsory.

    6 x 2 = 12
  17. What are exogenous buds?

  18. How is polyspermy avoided in humans?

  19. Expand (a) SRY (b) TDF

  20. Given below is mRNA sequence. Mention the amino acids sequence that is formed after its translation.

  21. Mention any two drugs to treat insomnia patient

  22. Define ecology.

  23. What will happen if all producers are removed from ecosystem?

  24. What is maida? Mention its culinary purpose.

  25. Name and explain the type of barriers which involve macrophages.

  26. Part III

    Answer any 6 of the questions. Question no.33 is compulsory.

    6 x 3 = 18
  27. Taking the example of Peppered moth, explain the action of natural selection. What do you call the above phenomenon?

  28. Explain the role of cry-genes in genetically modified crops.

  29. What is ecological density, crude density and population density?

  30. What is a biosphere reserve?

  31. Why does the zygote divides only after the division of Primary endosperm cell.

  32. What is Synapsis? Explain its types.

  33. Differentiate habitat from niche.

  34. Which one gas is most abundant out of the four commonest greenhouse gases? Discuss the effect of this gas on the growth of plants?

  35. Given below are the examples of symbiotic association in which one partner was mentioned. Write the name of the mutual co-partners.
    (a) Azolla fem + _________
    (b) Root nodules of legume plants + ______
    (c) phycomycetous fungi + ________

  36. Part IV

    Answer all the 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. Write the preventive measures of STDs.

    1. Draw a flow chart depicting the steps of DNA fingerprinting technique.

    2. Enumerate the characteristic features of Entomophilous flowers

    1. Describe incomplete dominance exhibited by Mirabilis jalapa.

    2. Write the protocol for artificial seed preparation.

    1. Point out any five morphological adaptations of epiphytes.

    2. Various stages of succession are given bellow. From that rearrange them accordingly. Find out the type of succession and explain in detail.
      Reed-swamp stage, phytoplankton stage, shrub stage, submerged plant stage, forest stage, submerged free floating stage, marsh medow stage.

    1. Explain afforestation with case studies.

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

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