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

12th Standard

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Biology

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

    Answer all the questions

    25 x 1 = 25
  1. Evolutionary history of an organism is called

    (a)

    ancestry

    (b)

    ontogeny

    (c)

    phylogeny

    (d)

    paleontology

  2. Allergy involves

    (a)

    IgE

    (b)

    IgG

    (c)

    lgA

    (d)

    IgM

  3. Recombinant Factor VIII is produced in the ______ cells of the Chinese Hamster

    (a)

    Liver cells

    (b)

    blood cells

    (c)

    ovarian cells

    (d)

    brain cells.

  4. Which of the following is correct for r-selected species

    (a)

    Large number of progeny with small size

    (b)

    large number of progeny with large size

    (c)

    small number of progeny with small size

    (d)

    small number of progeny with large size

  5. The Ozone Day is observed every year on September 16 as on this day in 1987 the ___________was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra-violet rays of the sun from reaching the earth. Fill the correct word in blank.

    (a)

    Montreal Protocol

    (b)

    Geneva Protocol

    (c)

    Kyoto Protocol

    (d)

    Nagoya Protocol

  6. A Plant called X possesses small flower with reduced perianth and versatile anther. The probable agent for pollination would be

    (a)

    water

    (b)

    air

    (c)

    butterflies

    (d)

    beetles

  7. Select the correct statement from the ones given below with respect to dihydrid cross

    (a)

    Tightly linked genes on the same chromosomes show very few combinations

    (b)

    Tightly linked genes on the same chromosomes show higher combinations

    (c)

    Genes far apart on the same chromosomes show very few recombinations

    (d)

    Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones

  8. The 1 : 2 : 1 ratio of co-dominance process Mendel's ___________

    (a)

    Law of dominance

    (b)

    Law of recessiveness

    (c)

    Law of segregation

    (d)

    Law of independent assortment

  9. Changing the codon AGC to AGA represents

    (a)

    mis-sense mutation

    (b)

    non-sense mutation

    (c)

    frameshift mutation

    (d)

    deletion mutation

  10. Observe the gene sequence and identify the types of aberration ABC BCD E F?

    (a)

    Tandem duplication

    (b)

    Simple duplication

    (c)

    Reverse tandem duplication

    (d)

    Displaced tandem duplication

  11. `In which techniques Ethidium Bromide is used?

    (a)

    Southern Blotting techniques

    (b)

    Western Blotting techniques

    (c)

    Polymerase Chain Reaction

    (d)

    Agrose Gel Electroporosis

  12. Assertion (A): DMH -11 is a transgenic mustard.
    Reason (R): It is developed by using bamase/ barstar technology.

    (a)

    Both A and R are wrong.

    (b)

    A is right R is wrong.

    (c)

    R explains A.

    (d)

    A and R are right, R does not explain A.

  13. Which of the following statement is correct

    (a)

    Agar is not extracted from marine algae such as seaweeds

    (b)

    Callus undergoes differentiation and produces somatic embryoids.

    (c)

    Surface sterilization of explants is done by using mercuric bromide

    (d)

    PH of the culture medium is 5.0 to 6.0

  14. Assertion (A) : Development of root from callus is called caulogenesis.
    Reason (R) : Caulogenesis is the final step of protoplasmic fusion.

    (a)

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

    (b)

    R explains A

    (c)

    A is correct R is incorrect

    (d)

    Both A and R are incorrect

  15. Read the given statements and select the correct option.
    Statement A : Cattle do not graze on weeds of Calotropis.
    Statement B : Calotropis have thorns and spines, as defense against herbivores.

    (a)

    Both statements A and B are incorrect.

    (b)

    Statement A is correct but statement B is incorrect

    (c)

    Both statements A and B are correct but statement B is not the correct explanation of statement A.

    (d)

    Both statements A and B are correct and statement B is the correct explanation of statement A.

  16. In a fresh water environment like pond, rooted autotrophs are

    (a)

    Nymphaea and typha

    (b)

    Ceratophyllum and Utricularia

    (c)

    Wolffia and pistia

    (d)

    Azolla and lemna

  17. Statement 1: Holoparsites depend totally on other organisms for nutrition.
    Statement 2: Durnta is holoparasite.

    (a)

    Statement 1 is correct. Statement 2 is incorrect.

    (b)

    Statement 1 is incorrect. Statement 2 is correct

    (c)

    Both the statements are correct.

    (d)

    Both the statements are incorrect

  18. Significance of food web is / are

    (a)

    it does not maintain stability in nature

    (b)

    it shows patterns of energy transfer

    (c)

    it explains species interaction

    (d)

    b and c

  19. Assertion (A): Pyramid of energy is upright.
    Reason (R): During the energy transfer at successive trophic levels from producers there will be a gradual decrease

    (a)

    Both A and R are wrong

    (b)

    A is right R is wrong

    (c)

    R explains A

    (d)

    A is right R is not the correct explanation for A

  20. Assertion (A): Social forestry refers to management of forests and afforestation on barren lands.
    Reason (R): Afforestation involves the cutting of trees.

    (a)

    A is correct R is incorrect.

    (b)

    A is incorrect R is correct.

    (c)

    R explains A.

    (d)

    Both A and R are incorrect.

  21. While studying the history of domestication of various cultivated plants _______ were recognized
    earlier

    (a)

    Centres of origin

    (b)

    Centres of domestication

    (c)

    Centres of hybrid

    (d)

    Centres of variation

  22. Observe the following statements and pick out the right option from the following:
    Statement I: The drug sources of Siddha include plants, animal parts, ores and minerals.
    Statement II: Minerals are used for preparing drugs with long shelf-life.

    (a)

    Statement I is correct

    (b)

    Statement II is correct

    (c)

    Both statements are correct

    (d)

    Both statements are wrong

  23. Identify the tamil name for flaked rice

    (a)

      Nel

    (b)

    Aval  

    (c)

    Pori

    (d)

    Umi

  24. B cells that produce and release large amounts of antibody are called

    (a)

    Memory cells

    (b)

    Basophils

    (c)

    Plasma cells

    (d)

    killer cells

  25. Lysozyme is an example of _______

    (a)

    Anatomical barrier

    (b)

    Physiological barrier

    (c)

    Phagocytic barrier

    (d)

    Inflammatory barrier

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