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

12th Standard

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Biology

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

    Answer all the questions

    25 x 1 = 25
  1. Animals giving birth to young ones:

    (a)

    Oviparous

    (b)

    Oviviviparous

    (c)

    Viviparous

    (d)

    Both a and b

  2. In, dinoflagellates the types of asexual reproduction seen is _____

    (a)

    Simple Binary fission

    (b)

    Multiple fission

    (c)

    Oblique binary fission

    (d)

    Longitudinal binary fission

  3. Regeneration is not seen in ______

    (a)

    Starfish

    (b)

    Lizard

    (c)

    Hydra

    (d)

    Sea Anemone

  4. The male sex hormone testosterone is secreted from

    (a)

    Sertoli cells

    (b)

    Leydig cell

    (c)

    Epididymis

    (d)

    Prostate gland

  5. Testosterone is secreted by ____

    (a)

    spermatocytes

    (b)

    sperm

    (c)

    polar bodies

    (d)

    leydig cells

  6. ______ is not linked to polymenorrhoea

    (a)

    Shorter cycle

    (b)

    Gland activity

    (c)

    Malnutrition

    (d)

    Pain

  7. The transfer of sperms by the male into the female genital tract is called _____

    (a)

    implantation

    (b)

    parturition

    (c)

    insemination

    (d)

    gastrulation

  8. Pick out the incorrect statements.

    (a)

    The upper rounded portion of ute ius is fundus

    (b)

    Uterus open into vagina through narrow cervix

    (c)

    Cervix is the organ of copulation in female.

    (d)

    Vagina extends from the cervix and opens to exterior

  9. Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

    (a)

    Syphilis, gonorrhoea and candidiasis

    (b)

    Syphilis, chlamydiasis and gonorrhoea

    (c)

    Syphilis, gonorrhoea and trichomoniasis

    (d)

    Syphilis, trichomoniasis and pediculosis

  10. Test tube baby is got by _____ technique.

    (a)

    IUI

    (b)

    CVS

    (c)

    ICSI

    (d)

    IVF

  11. Prevention of children from sexual offences is covered under ______ act

    (a)

    PCPNDT

    (b)

    patent act

    (c)

    ART

    (d)

    POCSO

  12. ABO blood group in man is controlled by

    (a)

    Multiple alleles

    (b)

    Lethal genes

    (c)

    Sex linked genes

    (d)

    Y-linked genes

  13. DNA and RNA are similar with respect to

    (a)

    Thymine as a nitrogen base

    (b)

    A single-stranded helix shape

    (c)

    Nucleotide containing sugars, nitrogen bases and phosphates

    (d)

    The same sequence of nucleotides for the amino acid phenyl alanine

  14. Fossils are generally found in

    (a)

    igneous rocks

    (b)

    metamorphic rocks

    (c)

    volcanic rocks

    (d)

    sedimentary rocks

  15. The sporozoite of the malarial parasite is present in ______

    (a)

    saliva of infected female Anopheles mosquito

    (b)

    RBC of human suffering from malaria.

    (c)

    Spleen of infected humans

    (d)

    Gut of female Anopheles mosquito

  16. Find out the mismatched pair

    (a)
    Group Drugs
    Depressant Tranquilizers
    (b)
    Group Drugs
    Cannabis Morphine
    (c)
    Group Drugs
    Hallucinogens LSD
    (d)
    Group Drugs
    Stimulants Cocaine
  17. Transgenic animals are those which have

    (a)

    Foreign DNA in some of their cells

    (b)

    Foreign DNA in all their cells

    (c)

    Foreign RNA in some of their cells

    (d)

    Foreign RNA in all their cells

  18. Identify those proper sequence of ELISA testin

    (a)

    Coating \(\rightarrow \) Blocking ~ Detection \(\rightarrow \) Read out

    (b)

    Detection \(\rightarrow \) Read out\(\rightarrow \) Coating \(\rightarrow \) Blocking

    (c)

    Read out\(\rightarrow \) Coating \(\rightarrow \) Detection \(\rightarrow \) Blocking

    (d)

    Blocking \(\rightarrow \) Detection \(\rightarrow \) Read out \(\rightarrow \) Coating

  19. The relationship between sucker fish and shark is__________

    (a)

    Competition

    (b)

    Commensalism

    (c)

    Predation

    (d)

    Parasitism.

  20. With which of the following, the Agenda 21’ of Rio Summit, 1992 is related to?

    (a)

    Sustainable development

    (b)

    Combating the consequences of population

    (c)

    Mitigation norms of Green House Gases (GHGs) emission

    (d)

    Technology transfer mechanism to developing countries for ‘clean-energy’ production

  21. The 2018 UN climate change conference was held in ___________

    (a)

    Rwanda

    (b)

    New York

    (c)

    Russia

    (d)

    Poland

  22. An eminent Indian embryologist is

    (a)

    S.R.Kashyap

    (b)

    P.Maheswari

    (c)

    M.S. Swaminathan

    (d)

    K.C.Mehta

  23. In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype

    (a)

    aaBB

    (b)

    AaBB

    (c)

    AABB

    (d)

    aabb

  24. The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

    (a)

    25 AB, 25 ab, 25 Ab, 25 aB

    (b)

    10 AB, 10 ab

    (c)

    45 AB, 45 ab

    (d)

    45 AB, 45 ab, 5 Ab, 5aB

  25. Plasmids are

    (a)

    circular protein molecules

    (b)

    required by bacteria

    (c)

    tiny bacteria

    (d)

    confer resistance to antibiotics

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