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12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Two

12th Standard

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Biology

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

    Answer all the questions

    25 x 1 = 25
  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. Ovovivipary is seen in ______

    (a)

    Solenobia

    (b)

    Humans

    (c)

    Birds

    (d)

    Shark

  3. In _____ types of parthenogenesis egg can develop into individuals of any sex.

    (a)

    Thelytoky

    (b)

    paedogenesis

    (c)

    Amphitoky

    (d)

    Arrhenotoky

  4. Given below, are a few statements related to external fertilization. Choose the correct statements:
    i. The male and female gametes are formed and released simultaneously
    ii. Only a few gametes are released into the medium
    iii. Water is the medium in a majority of organism exhibiting external fertilization
    iv. Offspring formed as a result of external fertilization have better chance of survival than those formed inside the organism

    (a)

    iii and iv

    (b)

    i and iii

    (c)

    ii and iv

    (d)

    i and iv

  5. The male homologue of the female clitoris is

    (a)

    Scrotum

    (b)

    Peni

    (c)

    Urethra

    (d)

    Testis

  6. Assertion (A): The acrosome of the Sperm cell contains Sperm lysin.
    Reason (R): Sperm lysin destroys the deformed Sperm cells.

    (a)

    R explains A

    (b)

    A is right R is wrong

    (c)

    A an R are right R does not explains A

    (d)

    Both A and R are wrong

  7. The scrotum acts as _____ for spermatogenesis.

    (a)

    chemoregulator

    (b)

    thermoregulator

    (c)

    enzyme regulator

    (d)

    photo regulator

  8. Identify the correct sequence of reproductive events in human beings.

    (a)

    Insemination, Implantation, Fertilization, Parturition and Placentation

    (b)

    Implantation, Fertilization, Insemination, Placentation and Parturition.

    (c)

    Implantation, Insemination, Fertilization, Parturition and Placentation

    (d)

    Insemination, Fertilization, Implantation, Placentation and Parturition.

  9. A contraceptive pill prevents ovulation by

    (a)

    blocking fallopian tube

    (b)

    inhibiting release of FSH and LH

    (c)

    stimulating release of FSH and LH

    (d)

    causing immediate degeneration of released ovum.

  10. Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

    (a)

    IA IB and ii

    (b)

    IA Io and IBIo

    (c)

    IB IB and IA IA

    (d)

    IA IA and ii

  11. If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be

    (a)

    IA IA and IB Io

    (b)

    IA Io and IB Io

    (c)

    IA Io and IoIo

    (d)

    IoIo and IB IB

  12. Evolutionary history of an organism is called

    (a)

    ancestry

    (b)

    ontogeny

    (c)

    phylogeny

    (d)

    paleontology

  13. Australian ape Man refers to

    (a)

    Ramapithecus

    (b)

    Australopithecus

    (c)

    Dryopithecus

    (d)

    Sivapithecus

  14. Identify the wrong statement.

    (a)

    Vaccine provide passive acquired immunity

    (b)

    It is made from attenuated or killed microbes

    (c)

    Vaccines teach our body how to defend from microbes

    (d)

    MMR is a fist generation vaccine

  15. Using recombinant E.Coli, mass production of hGH is carried out by_______

    (a)

    genetic engineering

    (b)

    biotechnology

    (c)

    fermentation technology

    (d)

    recombinant DNA

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

    Column I Column II
    A. Mutalism 1. Lion and deer
    B. Commensalism 2. Round worm and man
    C. Parasitism 3. Birds compete with squirrels for nuts
    D. Competition 4. Sea anemone on hermit crab
    E. Predation 5. Bernacles attached to Whales.

     

    (a)

    A- 4, B-5, C-2, D –3, E-1

    (b)

    A- 3, B-1, C-4, D – 2, E-5

    (c)

    A- 2, B-3, C-1, D – 5, E-4

    (d)

    A- 5, B-4, C-2, D – 3, E-1

  17. Consider the following four conditions (A-D) and select the correct pair of them as adaptation to environment in desert lizards.
    The conditions:
    A) Burrowing in soil to escape high temperature.
    B) Losing heat rapidly from the body during high temperature
    C) Bask in sun when temperature is low
    D) Insulating body due to thick fatty dermis.

    (a)

    (A) and (C)

    (b)

    (B) and (D)

    (c)

    (A) and (B)

    (d)

    (C) and (D)

  18. First cell of male gametophyte in angiosperm is

    (a)

    Microspore

    (b)

    megaspore

    (c)

    Nucleus

    (d)

    Primary Endosperm Nucleus

  19. In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombination type offspring. This indicates

    (a)

    The two genes are located on two different chromosomes

    (b)

    Chromosomes failed to separate during meiosis

    (c)

    The two genes are linked and present on the some chromosome

    (d)

    Both of the characters are controlled by more than one gene

  20. An analysis of chromosomal DNA using the southern hybridisation technique does not use

    (a)

    Electrophoresis

    (b)

    Blotting

    (c)

    Autoradiography

    (d)

    Polymerase Chain Reaction

  21. Cryopreservation means it is a process to preserve plant cells, tissues or organs

    (a)

    at very low temperature by using ether.

    (b)

    at very high temperature by using liquid nitrogen

    (c)

    at very low temperature of -196 by using liquid nitrogen

    (d)

    at very low temperature by using liquid nitrogen

  22. In soil water available for plants is

    (a)

    gravitational water

    (b)

    chemically bound water

    (c)

    capillary water

    (d)

    hygroscopic water

  23. Pond is a type of

    (a)

    forest ecosystem

    (b)

    grassland ecosystem

    (c)

    marine ecosystem

    (d)

    fresh water ecosystem

  24. Plants having similar genotypes produced by plant breeding are called

    (a)

    clone

    (b)

    haploid

    (c)

    autopolyploid

    (d)

    genome

  25. Tamarindus indica is indigenous to

    (a)

    Tropical African region

    (b)

    South India, Sri Lanka

    (c)

    South America, Greece

    (d)

    India alone

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