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12th Standard Biology English Medium Free Online Test Book Back One Mark Questions - Part Three

12th Standard

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Biology

Time : 00:10:00 Hrs
Total Marks : 10

    Answer all the questions

    10 x 1 = 10
  1. Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: In bee society, all the members are diploid except drones.
    Reason: Drones are produced by parthenogenesis

    (a)

    If both A and R are true and R is correct explanation for A

    (b)

    If both A and R are true but R is not the correct explanation for A

    (c)

    If A is true but R is false

    (d)

    If both A and R are false

  2. The foetal membrane that forms the basis of the umbilical cord is

    (a)

    Allantois

    (b)

    Amnion

    (c)

    Chorion

    (d)

    Yolk sac

  3. Identify the correct statements from the following

    (a)

    Chlamydiasis is a viral disease

    (b)

    Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium

    (c)

    The incubation period for syphilis is is 2 to 14 days in males and 7 to 21 days in females

    (d)

    Both syphilis and gonorrhoea are easily cured with antibiotics

  4. Which of the following is not correct?

    (a)

    Three or more alleles of a trait in the population are called multiple alleles

    (b)

    A normal gene undergoes mutations to form many alleles

    (c)

    Multiple alleles map at different loci of a chromosome

    (d)

    A diploid organism has only two alleles out of many in the population

  5. Pataus’ syndrome is also referred to as

    (a)

    13-Trisomy

    (b)

    18-Trisormy

    (c)

    21-Trisormy

    (d)

    None of these

  6. 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

  7. Who proposed the Germplasm theory?

    (a)

    Darwin

    (b)

    August Weismann

    (c)

    Lamarck

    (d)

    Alfred Wallace

  8. Which one of the following palindromic base sequence in DNA can be easily cut at about the middle by some particular restriction enzymes?

    (a)

    5' CGTTCG 3' 3' ATCGTA 5'

    (b)

    5'GATATG 3'  3' CTACTA 5'

    (c)

    5'GAATTC 3' 3' CTTAAG 5'

    (d)

    5'CACGTA 3' 3' CTCAGT 5'

  9. Match the following :
    Column A
    Column B
    1) Totipotency A) Reversion of mature cells into meristerm
    2) Dedifferentiation B) Biochemical and structural changes of cells
    3) Explant C) Properties of living cells develops into entire plant
    4) Differentiation D) Selected plant tissue transferred to culture medium

    (a)

    C A D B

    (b)

    A C B D

    (c)

    B A D C

    (d)

    D B C A

  10. A specific place in an ecosystem, where an organism lives and performs its functions is

    (a)

    habitat

    (b)

    niche

    (c)

    landscape

    (d)

    biome

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TN 12th Standard Biology free Online practice tests

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