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12th Standard English Medium Biology Reduced Syllabus Annual 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. Identify the correct option to label the diagram Identify the structure
    1- Immature proglottids
    2 - Gravid proglottids
    3 - Scolex
    4 - Mature proglottids
    5 - Neck

    (a)

    1-C 2-E 3-A 4-D 5-B

    (b)

    1-B 2-D 3-C 4-E 5-A

    (c)

    1-D 2-E 3-B 4-C 5-A

    (d)

    1-A 2-E 3-D 4-B 5-C

  2. Match column I with column II and select the correct option from the codes given below.

    Column I Column II
    A. Copper releasing IUD (i) LNG-20
    B. Hormone releasing (ii) Lippes loop IUD
    C. Non medicated IUD (iii) Saheli
    D. Mini pills (iv) Multiload-375
    (a)

    A-(iv), B-(ii), C-(i), D-(iii)

    (b)

    A-(iv), B-(i), C-(iii), D-(ii)

    (c)

    A-(i), B-(iv), C-(ii), D-(iii)

    (d)

    A-(iv), B-(i), C-(ii), D-(iii)

  3. Semi-conservative model of replication was proved by _________

    (a)

    Hershey and Chase

    (b)

    Griffith

    (c)

    Meselson and Stahl

    (d)

    Macleod and McCarty

  4. Modern man belongs to which period?

    (a)

    Quaternary

    (b)

    Cretaceous

    (c)

    Silurian

    (d)

    Cambrian

  5. _________is used for recycling of PET plastics

    (a)

    Dechloromonas aromatica

    (b)

    Phanerochaete chrysosporium

    (c)

    Ideonella sakaiensis

    (d)

    Nitrosomonas

  6. Animals that can move from fresh water to sea called as______

    (a)

    Stenothermal

    (b)

    Eurythermal

    (c)

    Catadromous

    (d)

    Anadromous

  7. Nuts are eaten by birds and squirrels. This is an example of an interaction called _____________

    (a)

    Commensalism

    (b)

    Mutualism

    (c)

    Amensalism

    (d)

    Competition

  8. Innermost layer of anther wall is ________________

    (a)

    Endothecium

    (b)

    Endothecum

    (c)

    Endothelium

    (d)

    Tapetum

  9. Accurate mapping of genes can be done by three point test cross because increases

    (a)

    Possibility of single cross over

    (b)

    Possibility of double cross over

    (c)

    Possibility of multiple cross over

    (d)

    Possibility of recombination frequency

  10. Assertion (A): Complete linkage is noticed in male species of Drosophila.
    Reason (R): Completely linked genes show some crossing over.

    (a)

    A is true R is false

    (b)

    Both A and R are false

    (c)

    A is true, R is not correct explanation for A

    (d)

    R explains A

  11. The prevention of large scale loss of biological interity

    (a)

    Biopatent

    (b)

    Bioethics

    (c)

    Biosafety

    (d)

    Biofuel

  12. Utricularia is a __________.

    (a)

    Rooted floating hydrophyte

    (b)

    Submerged floating hydrophyte

    (c)

    Rooted submerged hydrophyte

    (d)

    Amphibious hydrophyte

  13. The upright pyramid is not a feature of _______

    (a)

    Pond ecosystem

    (b)

    Grassland ecosystem

    (c)

    Forest ecosystem

    (d)

    Terminal ecosystem

  14. ___________ is not a method of waste water treatment.

    (a)

    oxidation ponds

    (b)

    Anaerobic lagoons

    (c)

    Catalytic converter

    (d)

    Anaerobic bioreactor

  15. Consider the following statements and choose the right option.
    i) Cereals are members of grass family.
    ii) Most of the food grains come from monocotyledon.

    (a)

    (i) is correct and (ii) is wrong

    (b)

    Both (i) and (ii) are correct

    (c)

    (i) is wrong and (ii) is correct

    (d)

    Both (i) and (ii) are wrong

  16. Part II

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

    6 x 2 = 12
  17. What is artificial parthenogenesis?

  18. At what stage of development are the gametes formed in new born male and female?

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

  20. How many base pairs are present in one complete turn of DNA helix? What is the distance between two consecutive base pairs?

  21. Name the causative agent and confirmatory test for Typhoid.

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

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

  24. Write the health benefits of Kodo millet.

  25. How does saliva act inbody defence?

  26. Part III

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

    6 x 3 = 18
  27. How does Mutation theory of De Vries differ from Lamarck and Darwin’s view in the origin of new species.

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

  29. Classify the adaptive traits found in organisms

  30. What is extinction?

  31. List out the functions of tapetum.

  32. Differentiate Missense mutation from Nonsense mutation.

  33. What are the adverse effects of temperature on plant?

  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. Point out the objectives of plant breeding.

  36. Part IV

    Answer all the questions.

    5 x 5 = 25
  37. Explain the role of oxytocin and relaxin in parturition and lactation.

  38. Write the preventive measures of STDs.

  39. Explain the properties of DNA that makes it an ideal genetic material.

  40. Discuss the steps involved in Microsporogenesis.

  41. How does the wrinkled gene make Mendel's peas wrinkled? Find out the molecular explanation.

  42. Give an account on Cryopreservation.

  43. What does competition refers to? Classify and describe it.

  44. Generally in summer the forest are affected by natural fire. Over a period of time it recovers itself by the process of successions .Find out the types of succession and explain.

  45. Explain afforestation with case studies.

  46. Write the botanical name, origin, cultivational area and uses of Black gram.
    Botanical name : Vigna mungo

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