CBSE Class 12th Biology Practice Paper Set 1

30 Questions | Total Attempts: 617

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CBSE Class 12th Biology Practice Paper Set 1

This practice paper is completely based on the CBSE class 12th Biology question paper 2012 in MCQ form to build you concept in class 12th biology This practice paper can also be helpful for NEET (AIPMT) For example: Q. Why is it important to feed the newborn babies on colostrum? The above given question could be asked in NEET in the following way: Q. Read the important statement in favor of colostrums i. It produces immunoglobulin and cytokines where IgA is in highest proportion ii. It provides vitamins and essential oils but not minerals iii. It transfer growth factor like epidermal and epithelial growth factor iv. It is nature’s perfect first food Se


Questions and Answers
  • 1. 
    Banana is considered a good example of parthenocarpy because
    • A. 

      It produces seedless fruit in the absence of successful fertilization

    • B. 

      It produces seedless fruit in the presence of successful fertilization

    • C. 

      It produces seedless fruit in the absence of successful Ovulation

    • D. 

      It produces leafless fruit in the absence of successful ovulation

  • 2. 
    Two different roles of spleen in the human body are
    • A. 

      Inhibit the filtration process plus remanufacture damaged red blood cells

    • B. 

      Control the breakdown of sugar and developing immunity against infection

    • C. 

      Developing immunity that is protection against infection plus recognizes and removes old, malformed, or damaged red blood cells

    • D. 

      All of the above are the function of spleen

  • 3. 
    A garden pea plant produced axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant traits.
    • A. 

      White and green

    • B. 

      Red and green

    • C. 

      White and purple

    • D. 

      Pink yellow

  • 4. 
    It is desirable to use unleaded petrol in vehicles fitted with catalytic converters. Select the correct option for the main function of catalytic convertor?
    • A. 

      Reduce the emission of CFC

    • B. 

      To get the good efficiency of the engine

    • C. 

      Stop the emission of other dangerous compounds

    • D. 

      Reduce the emission of other dangerous compounds

  • 5. 
    Identify the location and function of acrosome in human body
    • A. 

      In the head part of the sperm, provide mobility to the sperm and to promote meiosis following fertilization

    • B. 

      In the middle part of the sperm, provide mobility to the sperm and to inhibit meiosis following fertilization

    • C. 

      In the middle part of the chromosome, facilitate linkage during meiosis following fertilization

    • D. 

      In the head part of the sperm ,stores powerful enzymes needed to avoid the egg (zona pellucida)

  • 6. 
    Select the name of most common species of bees suitable for apiculture
    • A. 

      Apis indica

    • B. 

      Apis florae

    • C. 

      Apis mellifera

    • D. 

      Apis dorsat

  • 7. 
    Write the name of an improved breed of chicken
    • A. 

      Leghorn

    • B. 

      Rhode Island Red

    • C. 

      Ancona and Minorca

    • D. 

      Light Sussex

  • 8. 
    Comment on the similarity between the wing of a cockroach and the wing of a bird. What do you infer from the above, with reference to evolution?
    • A. 

      Basically they are analogous as differ in origin and functionally similar

    • B. 

      Basically they are analogous as differ in function and similar in origin

    • C. 

      Basically they are homologous as differ in origin and functionally similar

    • D. 

      All are correct in reference of evolution

  • 9. 
    Choose the correct option in reference to the role of cyanobacteria as a biofertiliser
    • A. 

      They add inorganic matter to the soil and help in decreasing its fertility

    • B. 

      They add organic matter to the soil and to help in decreasing its fertility

    • C. 

      They add organic matter to the soil and to help in increasing its fertility

    • D. 

      They utilize organic matter to the soil and to help in increasing the porosity of the soil

  • 10. 
    Given is the structure of nucleosome          Choose the correct reason which enables histones to acquire a positive charge
    • A. 

      Presence of histidine and aspartic acid which are positively charged in their side chains

    • B. 

      Presence of lysine and arginine which are positively charged in their side chains

    • C. 

      Presence of lysine and aspartic acid which are positively charged in their side chains

    • D. 

      Presence of glutamic acid and aspartic acid which are positively charged in their side chains

  • 11. 
    Select the correct statement regarding cleistogamy
    • A. 

      It produces assured seed set only in the presence of pollinators

    • B. 

      It will lead to a strong progeny

    • C. 

      It produce a flower that are variably autogamus

    • D. 

      It produces assured seed set even in the absence of pollinators

  • 12. 
    Read the important statement in favor of colostrums   i. It produces immunoglobulin and cytokines where IgA is in highest proportion  ii. It provides vitamins and essential oils but not minerals iii. It transfer growth factor like epidermal and epithelial growth factor iv. It is nature’s perfect first food Select the incorrect option
    • A. 

      I, ii

    • B. 

      I, iv

    • C. 

      I, iii, iv

    • D. 

      I, iii

  • 13. 
    Choose the correct option for β-Galactosidese
    • A. 

      It is coded by “z” genes and responsible for the hydrolysis of lactose into galactose and glucose

    • B. 

      It is coded by “y” gene and responsible to increase the permeability of cell

    • C. 

      It is coded by “i” genes and responsible for the hydrolysis of lactose into galactose and glucose

    • D. 

      The main function of β-Galactosidese is to have an overall control on the functioning of all genes

  • 14. 
    Read all the statements about human testes   i. It is present in a pouch which helps to maintain the lower temperature of testes required for spermatogenesis ii. Each testes has about 500 compartments called seminiferous tubules iii. Testes has leydig cells to synthesis and secrete androgen hormone iv. In adults, each testes is circular shape   Select the correct statement from above
    • A. 

      I, ii

    • B. 

      I, iii

    • C. 

      Iii, iv and i

    • D. 

      I, iv

  • 15. 
    Parthenogenesis means
    • A. 

      Production of complete individual from unfertilized egg

    • B. 

      Production of incomplete individual from unfertilized egg

    • C. 

      Production of fruit from unfertilized ovule

    • D. 

      Production of incomplete flower from unfertilized ovule

  • 16. 
    Name the plant source of ganja. How does it affect the body of the abuser?
    • A. 

      Leaves and the raisin of cannabis plant and it directly affects the respiratory system

    • B. 

      Leaves and the raisin of Atropa belladona and it directly affects the cardiovascular system

    • C. 

      Leaves and the raisin of Atropa belladona and it directly affects the cardiovascular system

    • D. 

      Leaves and the raisin of cannabis plant and it directly affects the cardiovascular system

  • 17. 
    Identify the cause and the body system affected by ADA deficiency in humans.
    • A. 

      Deletion of gene for ADA which effects the functioning of immune system

    • B. 

      Substitution of gene for ADA which effects the functioning of immune system

    • C. 

      Deletion of gene for ADA which effects the functioning of pancreatic glands

    • D. 

      Addition of gene for ADA which effects the functioning of immune system

  • 18. 
    Bacterium that causes typhoid and mention one diagnostic symptoms
    • A. 

      Retrovirus and sustained high fever

    • B. 

      Salmonella typhi and sustained high fever

    • C. 

      Salmonella typhoid and loss of Visuality

    • D. 

      Clostridium tetani and temporary paralysis

  • 19. 
    In humans, the dominance relationship between the A and B alleles of the ABO blood group gene is an example of
    • A. 

      Complete dominance

    • B. 

      Incomplete dominance

    • C. 

      Codominance

    • D. 

      Epistasis

  • 20. 
    Select the incorrect statement which does not support the  Darwin’s theory of Natural Selection
    • A. 

      Members of a population do not have a heritable variations

    • B. 

      In a population, more individuals are produced each generations that can survive or reproduce

    • C. 

      The result of natural selection is a population adapted to it

    • D. 

      Some individuals have adaptive characteristics that enable them to survive and reproduce better than other individuals

  • 21. 
    The functions of umbilical cord is
    • A. 

      It supplies oxygen to the foetus

    • B. 

      It delivers nutrients to foetus

    • C. 

      It helps to withdraw blood rich in carbon dioxide and depleted in nutrients

    • D. 

      All the above are correct

  • 22. 
    Why are DNA polymerases from thermophilic organisms used in the polymerase chain reaction?
    • A. 

      Because they are required to keep the two strands separated

    • B. 

      Because they cannot add new nucleotides at low temperatures

    • C. 

      Because they are easier to isolate than psychrophilic DNA polymerases

    • D. 

      Because the priming and extension steps must be carried out at high temperatures to prevent the single strands from reannealing

  • 23. 
    Blood test in malaria should be done
    • A. 

      When temperature is low

    • B. 

      During evening when temperature is very low

    • C. 

      When temperature is high

    • D. 

      During night only

  • 24. 
    An insect becomes resistant to parasite is an example of
    • A. 

      Artificial selection

    • B. 

      Mercy killing

    • C. 

      Origin of species

    • D. 

      Natural selection

  • 25. 
    Choose the correct salient features / features of double helix structure of DNA
    • A. 

      It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate and the bases project inside

    • B. 

      The pitch of the helix is 3.4nm and there are roughly 10 bp in each turn

    • C. 

      Two nucleotides are linked through phosphodiester bond

    • D. 

      All of the above are correct

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