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12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - Part Six

12th Standard

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Biology

Time : 00:25:00 Hrs
Total Marks : 25

    Answer all the questions

    25 x 1 = 25
  1. This is a method of sexual reproduction in which individuals of the same species temporarily write and exchange certain. amount of nuclear material and then get separated.

    (a)

    Syngamy

    (b)

    Conjugation

    (c)

    Parthenogenesis

    (d)

    Paedogenesis

  2. Find the wrongly matched pair

    (a)

    Bleeding phase- fall in oestrogen and progesterone

    (b)

    Follicular phase-rise in oestrogen

    (c)

    Luteal phase - rise in FSH level

    (d)

    Ovulatory phase - LH surge

  3. The _____ prevents poly spermy.

    (a)

    vitelline membrane

    (b)

    fertilization membrane

    (c)

    zona pellucida

    (d)

    corona radiata

  4. Observe the diagram and select the correct option denoting the proper sequence of parts.

    (a)
    A B C D
    Isthmus Fimbriae Infundibulum Uterus
    (b)
    A B C D
    Fimbriae Infundibulum Uterus Isthmus
    (c)
    A B C D
    Infundibulum Uterus Isthmus Fimbriae
    (d)
    A B C D
    Fimbriae Infundibulum Uterus Fimbriae
  5. Fatigue, jaundice, fever, rash, stomach pain, liver Cirrhosis and liver failure - are the symptoms of

    (a)

    Chalmydiasis

    (b)

    Lynphogvanuloma Veneveum

    (c)

    Hepatitis

    (d)

    Syphilis

  6. _____ is a cause of infertility in women.

    (a)

    varicocoele

    (b)

    Endometriosis/Uterine fibroids

    (c)

    well developed ovaries

    (d)

    hormonal balance

  7. Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

    (a)

    AB

    (b)

    O

    (c)

    A

    (d)

    B

  8. The XX - XY type of sex determination is also known as ________ type.

    (a)

    Haploid - diploid

    (b)

    Lygaeus

    (c)

    Gynandromorphs

    (d)

    Genic balance

  9. The first codon to be deciphered was __________ which codes for ________.

    (a)

    AAA, proline

    (b)

    GGG, alanine

    (c)

    UUU, Phenylalanine

    (d)

    TTT, arginine

  10. _______is unique for DNA.

    (a)

    Adenine

    (b)

    Uracil

    (c)

    Guanine

    (d)

    Thymine

  11. Chromosome __________ has 231 genes only.

    (a)

    X

    (b)

    19

    (c)

    Y

    (d)

    22

  12. ____________ era is called Golden age of reptiles.

    (a)

    Paleozoic

    (b)

    Mesozoic

    (c)

    Precambrian

    (d)

    Cenozoic

  13. _________Can be confirmed by widal test.

    (a)

    Tuberculisis

    (b)

    Cholera

    (c)

    Typhoid

    (d)

    Hepatitis

  14. A pair of fungal disease _____________

    (a)

    Amoebiasis, Kala-azar

    (b)

    Candidiasis, Athlete's foot

    (c)

    Ascariasis, Filariasis

    (d)

    Poliomyelitis, Amoebiasis

  15. Which of the following is not involved in nitrogen fixation?

    (a)

    Pseudomonas

    (b)

    Azotobacter

    (c)

    Anabaena

    (d)

    Nostac

  16. Stem cells that can differentiate into various types of cells that are related in an organism is called

    (a)

    Multipotent

    (b)

    Oligopotent

    (c)

    Pluripotent

    (d)

    Unipotent

  17. What type of human population is represented by the following age pyramid?

    (a)

    Vanishing population

    (b)

    Stable population

    (c)

    Declining population

    (d)

    Expanding population

  18. People who have migrated from the planes to an area adjoining Rohtang Pass about six months back

    (a)

    Have more RBC's and their haemoglobin has a lower binding affinity to O2

    (b)

    Are not physically fit to play games like football

    (c)

    Suffer from altitude sickness with symptoms like nausea, fatigue, etc.

    (d)

    Have the usual RBC count but then haemoglobin has very high binding affinity to O2.

  19. The highest DDT concentration in aquatic food chain shall occur in

    (a)

    Seagull

    (b)

    Crab

    (c)

    Cell

    (d)

    Phytoplankto

  20. Assertion (A): Pleiotropic gene affects multiIple traits
    Reason (R): ABO blood group is an example for Pleiotropism

    (a)

    A and R are correct R explains A

    (b)

    A and R are incorrect

    (c)

    A is correct R is incorrect

    (d)

    A is incorrect R is correct

  21. Factor hypothesis was proposed by _________

    (a)

    Reginald Punnett

    (b)

    W. Bateson

    (c)

    Gregor Mendel

    (d)

    Carl Correns

  22. Sharbati Sonara is a mutant wheat variety which is developed by irradiating the seeds with _________

    (a)

    Thermal neutrons

    (b)

    Gamma radiation

    (c)

    X-rays

    (d)

    UV radiations

  23. A vector should________
    (i) contain suitable marker
    (ii) contain ori site
    (iii) have poly linkess
    (iv) be small in size

    (a)

    i, ii and iii

    (b)

    ii, iii and iv

    (c)

    i, ii and iv

    (d)

    all the above

  24. The term used to define the ability of a cell to generate entire individual is

    (a)

    Pleuripotent

    (b)

    Totipotent

    (c)

    Multipotent

    (d)

    Unipotent

  25. Ophrys an orchid resembling the female of an insect so as to able to get pollinated is due to phenomenon of

    (a)

    Myrmecophily

    (b)

    Ecological equivalents

    (c)

    Mimicry

    (d)

    None of these

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