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12th Standard Biology English Medium Reduced Syllabus Model Question paper - 2021 Part - 1

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. In which type of parthenogenesis are only males produced?

    (a)

    Arrhenotoky

    (b)

    Thelytoky

    (c)

    Amphitoky

    (d)

    Both a and b

  2. The glandular accessory organ which produces the largest proportion of semen is

    (a)

    Seminal vesicle

    (b)

    Bulbourethral gland

    (c)

    Prostate gland

    (d)

    Mucous gland

  3. Read the given statements and select the correct option
    and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
    Statement 2: They are chemical barriers of conception and are reusable.

    (a)

    Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

    (b)

    Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

    (c)

    Statement 1 is correct but statement 2 is incorrect

    (d)

    Both statements 1 and 2 are incorrect

  4. Which of the following is true about Rh factor in the offspring of a parental combination DdXDd (both Rh positive)?

    (a)

    All will be Rh-positive

    (b)

    Half will be Rh positive

    (c)

    About ¾ will be Rh negative

    (d)

    About one fourth will be Rh negative

  5. Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number

    (a)

    20

    (b)

    21

    (c)

    4

    (d)

    23

  6. Which of the following is the correct sequence of event with reference to the central dogma?

    (a)

    Transcription, Translation, Replication

    (b)

    Transcription, Replication, Translation

    (c)

    Duplication, Translation, Transcription

    (d)

    Replication, Transcription, Translation

  7. The wings of birds and butterflies is an example of

    (a)

    Adaptive radiation

    (b)

    convergent evolution

    (c)

    divergent evolution

    (d)

    variation

  8. Exo-erythrocytic schizogony of Plasmodium takes place in _______

    (a)

    RBC

    (b)

    Leucocytes

    (c)

    Stomach

    (d)

    Liver

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

    (a)

    Aspergillus niger

    (b)

    Manascus purpureus

    (c)

    Penicillium notatum

    (d)

    Trichoderma polysporum

  10. Which of the following is an r-species

    (a)

    Human

    (b)

    Insects

    (c)

    Rhinoceros

    (d)

    Whale

  11. Some organisms are able to maintain homeostasis by physical means _______

    (a)

    Conform

    (b)

    Regulate

    (c)

    Migrate

    (d)

    Suspend.

  12. Which among the following awards instituted by the Government of India for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting Wildlife?

    (a)

    Indira Gandhi Paryavaran Puraskar

    (b)

    Medini Puruskar Yojana

    (c)

    Amrita Devi Bishnoi Award

    (d)

    Pitambar Pant National Award

  13. Identify the correctly matched pair

    (a)

    Tuber - Allium cepa

    (b)

    Sucker - Pistia

    (c)

    Rhizome - Musa

    (d)

    Stolon - Zingiber

  14. Extra nuclear inheritance is a consequence of presence of genes in

    (a)

    Mitrochondria and chloroplasts

    (b)

    Endoplasmic reticulum and mitrochondria

    (c)

    Ribosomes and chloroplast

    (d)

    Lysososmes and ribosomes

  15. Match the following and choose the correct combination from the options given below:

    Column I (Interaction) Column II (Examples)
    I. Mutualism
    II. Commensalism
    III. Parasitism
    IV. Predation
    V. Amensalism
    i) Trichoderma and Penicillium
    ii) Balanophora, Orobanche
    iii) Orchids and Ferns
    iv) Lichen and Mycorrhiza
    v) Nepenthes and Diaonaea
    (a)
    I II III IV V
    i ii iii iv v
    (b)
    I II III IV V
    ii iii iv v i
    (c)
    I II III IV V
    iii iv v i ii
    (d)
    I II III IV V
    iv iii ii v i
    1. Part II

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

    6 x 2 = 12
  16. Identify the parts marked as A, B, C, D and E for the below diagram.

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

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

    (Barriers, Lactational amenorrhoea, CuT, Tubectomy)

  19. Gene therapy is an attempt to correct a Genetic defect by providing a normal gene into the individual. By this the function can be restored. An alternate method would be to provide gene product known as enzyme replacement therapy, which would also restore the function. Which in your opinion is a better option? Give reasons for your answer.

  20. Differentiate Grafting and Layering.

  21. Name the chemicals used in gene transfer.

    1. Part III

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


    6 x 3 = 18
  22. Differentiate Missense mutation from Nonsense mutation.

  23. What are the features that a vector must possess to facilitate cloning?

  24. What does the terms specification and claim refers with respect to patents?

  25. Nutrients are retained in the ecosystem. Discuss how and name the process through which it is achieved?

  26. Give a.brief account on In-situ conservation

  27. Provide an example for each of the following agricultural components. (i) Bio pesticide (ii) Green manure crop (iii) Bio-FertiIzier

    1. Part IV

      Answer all the questions.

    5 x 5 = 25
  28. Enumerate the steps involved in producing transgenic animals.

  29. Draw a Howchart depicting the various types of ploidy.

  30. List the characteristics of ecological succession.

  31. Write in detail about Remote sensing and its uses.

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

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