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12th Standard Zoology English Medium Free Online Test One Mark Questions 2020

12th Standard

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Zoology

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. Technique used for cultivation of sponges is based on ______

    (a)

    Multiple fission

    (b)

    Parthenogenesis

    (c)

    Regeneration

    (d)

    Autogamy

  2. Regeneration was first studied by _______

    (a)

    A.G. Tansley

    (b)

    Charles Bonnet

    (c)

    Abraham Trembley

    (d)

    Walter Gilbert

  3. The male homologue of the female clitoris is

    (a)

    Scrotum

    (b)

    Peni

    (c)

    Urethra

    (d)

    Testis

  4. _____ are endocrine cells.

    (a)

    Inhibitin

    (b)

    Leydig cells

    (c)

    Oogonia

    (d)

    Sertoli cells

  5. Sperms are released into the cavity of the seminiferous tubule by a process called _____

    (a)

    spermiogenesis

    (b)

    spermatogenesis

    (c)

    spermiation

    (d)

    gametogenesis

  6. The developing spermatoza are nourished by

    (a)

    Leydig cells

    (b)

    Sertoli cells

    (c)

    Follicular cells

    (d)

    Epididymis

  7. Statement (1): The endometrium acts as transitory endocrine gland secreting progesterone
    Statement (2): Progesterone maintains pregnancy

    (a)

    Statement 1 is correct; statement 2 is incorrect

    (b)

    Statement 1 is incorrect; statement 2-is correct

    (c)

    Both the statements 1 and 2 are correct.

    (d)

    Both the statements 1 and 2 are incorrect.

  8. 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)

  9. PAP smear can help to detect

    (a)

    Jaundice

    (b)

    Cancer

    (c)

    AIDS

    (d)

    Hepatitis B

  10. Identify the bacterial STI
    1. Affects the urethra, vectron and throat
    2. In females cervix is affected.
    3. Pain and pus discharge in the genital tract.
    4. Burning sensation during urination.

    (a)

    Gonorrhoea

    (b)

    Syphilis

    (c)

    Chlanydiasis

    (d)

    Lympho

  11. Father of a child is colourblind and mother is carrier for colourblindness, the probability of the child being colourblind is

    (a)

    25%

    (b)

    50%

    (c)

    100%

    (d)

    75%

  12. E. coli cell grown on 15N medium are transferred to 14N medium and allowed to grow for two generations. DNA extracted from these cells is ultracentrifuged in a cesium chloride density gradient. What density distribution of DNA would you expect in this experiment?

    (a)

    One high and one low density band

    (b)

    One intermediate density band.

    (c)

    One intermediate density band.

    (d)

    One low and one intermediate density band

  13. One difference between deoxyribose and Ribose is due to________.

    (a)

    One Oxygen atom more in Ribose

    (b)

    Two Oxygen atoms less in Deoxyribose

    (c)

    Two Carbon atoms less in Ribose

    (d)

    Four Carbon atoms more in Ribose

  14. The phenomenon of “ Industrial Melanism” demonstrates

    (a)

    Natural selection

    (b)

    induced mutation

    (c)

    reproductive isolation

    (d)

    geographical isolation

  15. The Athlete’s foot disease in human is caused by _______

    (a)

    Bacteria

    (b)

    Fungi

    (c)

    Virus

    (d)

    Protozoan

  16. The purpose of biological treatment of waste water is to _______

    (a)

    Reduce BOD

    (b)

    Increase BOD

    (c)

    Reduce sedimentation

    (d)

    Increase sedimentation

  17. Competition between species leads to

    (a)

    Extinction

    (b)

    Mutation

    (c)

    Amensalism

    (d)

    Symbiosis

  18. Conservation of biodiversity within their natural habitat is

    (a)

    Insitu conservation

    (b)

    Exsitu conservation

    (c)

    In vivo conservation

    (d)

    In vitro conservation

  19. The use of microorganism metabolism to remove pollutants such as oil spills in the water bodies is known as

    (a)

    Biomagnification

    (b)

    Bioremediation

    (c)

    Biomethanation

    (d)

    Bioreduction

  20. AIDS virus has

    (a)

    Single stranded RNA

    (b)

    Double stranded RNA

    (c)

    Single stranded DNA

    (d)

    Double stranded DNA

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