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12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 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. According to WHO, India is the ____________ largest HIV affected country.

    (a)

    first

    (b)

    second

    (c)

    third

    (d)

    seventh

  2. Kin selection is seen in _______

    (a)

    Honey bees

    (b)

    Drosophila

    (c)

    Grasshopper

    (d)

    Cockroach

  3. The codon _________ codes for phenylalanine

    (a)

    UAA

    (b)

    UUU

    (c)

    UCU

    (d)

    UAC

  4. AUG code is for ________

    (a)

    Arginine

    (b)

    Tyrosine

    (c)

    Tryptophan

    (d)

    Methionine

  5. The Neanderthal man had the brain capacity of

    (a)

    650 – 800cc

    (b)

    1200cc

    (c)

    900cc

    (d)

    1400cc

  6. According to Neo Darwinism change in the frequency of genes in population arise due to all. Except.

    (a)

    Natural selection

    (b)

    Mutation

    (c)

    Struggle for existence

    (d)

    Variation

  7. ________________ test is done to confirm typhoid.

    (a)

    ELISA

    (b)

    Western blot

    (c)

    Widal test

    (d)

    Southern blot

  8. Identify the correct statement(s).
    (i) Totipotency is the ability of single cell to produce a whole organism.
    (ii) Pluripotency refers to ability of stem cell with apotential to differentiate into any kind of germ layers.
    (iii) Unipotency refers to ability of stem cell to differentiate into one cell type.
    (iv) Oligopotency refers to stem cells to differentiate into few cell types.

    (a)

    i and iii

    (b)

    ii and iv

    (c)

    i and iv

    (d)

    all the above

  9. The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

    (a)
    A B C
    Conformer Regulator Partial Regulator
    (b)
       A     B     C
    Regulatorr Partial Regulator Conformer
    (c)
    A B C
    Partial Regulatorr Regulator Conformer
    (d)
    A B C
    Regulatorr Conformerr Partial Regulatorr
  10. Locomotory speed of an organism changes due to light. This phenomenon is referred as _____________

    (a)

    Photonasty

    (b)

    Photokinesis

    (c)

    Phototropism

    (d)

    Phototaxis

  11. The organization which published the red list of species is

    (a)

    WWF

    (b)

    IUCN

    (c)

    ZSI

    (d)

    UNEP

  12. Species introduced deliberately in an area are referred as_______

    (a)

    Endemic species

    (b)

    Vulnerable species

    (c)

    Exotic species

    (d)

    Extinct species

  13. Treatment of sewage involves

    (a)

    Floatation, Filtration and Sedimentation of suspended particles

    (b)

    Aerating it for bacterial action

    (c)

    Removal of nitrates and phosphates

    (d)

    All of the above

  14. Observe the diagram and select the correct option mentioning the parts A, B, C and D.

    (a)
    A B C D
    Synergid Egg polar nuclei Antipodals
    (b)
    A B C D
    Antipodals Synergid polar nuclei Egg
    (c)
    A B C D
    Egg Synergid Antipodals polar nuclei
    (d)
    A B C D
    Antipodals polar nuclei Egg Synergid
  15. Incase of co-dominance, monohybrid F 1 __________ is 1: 2: 1

    (a)

    Genotype ratio

    (b)

    Phenotype ratio

    (c)

    Both genotype & Phenotype ratio

    (d)

    Ratio is wrong

  16. Mechanism of crossing over involves the following stages. Select the correct sequence.

    (a)

    Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over

    (b)

    Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation

    (c)

    Terminalisation ~ Tetrad ~ Bivalent ~ Cross over

    (d)

    Cross over ~ Bivalent ~ Tetrad ~ Terminalisation

  17. 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

  18. Assertion (A) : Incubation is followed by Inoculation.
    Reason (R) : Explant is inoculated to media.

    (a)

    Both A and R are correct but R is not a correct explanation to A

    (b)

    R explains A

  19. The study of soil is called as __________

    (a)

    Lithotripsy

    (b)

    Lithosphere

    (c)

    Pedology

    (d)

    Pedigree analysis

  20. Observe the figures and select the correct type of pyramid of numbers.

    (a)
    A B C
    Grassland ecosystem Forest ecosystem Parasite ecosystem
    (b)
    A B C
    Grassland ecosystem Pond ecosystem Forest ecosystem
    (c)
    A B C
    Forest ecosystem Grassland ecosystem Parasite ecosystem
    (d)
    A B C
    Pond ecosystem Forest ecosystem Grassland ecosystem
  21. Which is not a true statement regarding rainwater harvesting?

    (a)

    Mitigates groundwater quality

    (b)

    Reduces soil erosion

    (c)

    Decreases soil salinity

    (d)

    No wastage of land for storing

  22. Statement (1): Clonal selection is carried out in asexually propagating plants.
    Statement (2): Clones show similar genotypes.

    (a)

    Statement 1 is correct and Statement 2 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

  23. Assertion (A): Black pepper is a spice.
    Reason (R): Condiments are flavouring substances, generally added after the cooking of food.

    (a)

    A is right R is wrong

    (b)

    R explains A

    (c)

    Both A and R are right. R is not correct explanation for A.

    (d)

    Both A and R are wrong

  24. The first disease for which vaccine was prepared is _______

    (a)

    Polio

    (b)

    Chicken pox

    (c)

    Cholera

    (d)

    Small pox

  25. ______ is the first one to encounter the antigen that enters tissue spaces.

    (a)

    Spleen

    (b)

    Lymph node

    (c)

    Bone marrow

    (d)

    GALT

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