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NEET-XII-Biology

Previous Year Paper year:2021

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    Section : A
  • Qstn #1
    Mutations in plant cells can be induced by :
    (A)Kinetin
    (B)Infrared rays
    (C)Gamma rays
    (D)Zeatin
    digAnsr:   C
    :
  • Qstn #2
    Match List - 1 with List - II.

    List - 1 List - 1
    a Cells with active cell division capacity i Vascular tissues
    b Tissue having all cells similar in structure and function ii Meristematic tissue
    c Tissue having different types of cells iii Sclereids
    d Dead cells with highly thickened walls and narrow lumen iv Simple tissue
    Select the correct answer from the options given below.
    (1) (a) - (ii) , (b) - (iv), c - (i) , d - (iii)
    (2) (a) - (iv) ,(b) - (iii), c - (ii), d - (i)
    (3) (a) - (i) , b - (ii), c - (iii), d - (iv)
    (4) (a) - (iii) , b - (ii), c - (iv), (d) - (i)
    digAnsr:   A
    :
  • Qstn #3
    Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?
    (A)Denaturation, Annealing, Extension
    (B)Denaturation, Extension, Annealing
    (C)Extension, Denaturation, Annealing
    (D)Annealing, Denaturation, Extension
    digAnsr:   A
    :
  • Qstn #4
    Match List - I with List - II.

    List - 1 List - 1
    a Lenticels i Phellogen
    b Cork cambium ii Suberin deposition
    c Secondary cortex iii Exchange of gases
    d Cork iv Phelioderm
    Choose the correct answer from the options given below.
    (A)
    (a) - (iv) ,
    (b) - (i),
    (c) - (iii) ,
    (d) - (ii)
    (B)
    (a) - (iii) ,
    (b) - (i),
    (c) - (iv) ,
    (d) - (ii)
    (C)
    (a) - (ii) ,
    (b) - (iii),
    (c) - (iv) ,
    (d) - (i)
    (D)
    (a) - (iv) ,
    (b) - (ii),
    (c) - (i) ,
    (d) - (iii)
    digAnsr:   B
    :
  • Qstn #5
    Complete the flow chart on central dogma.
    Biology Question Image
    (A)
    (a) - Replication;
    (b) -Transcription;
    (c) - Transduction;
    (d) - Protein
    (B)
    (a) -Translation;
    (b) - Replication;
    (c) -Transcription;
    (d) -Transduction
    (C)
    (a) - Replication;
    (b) - Transcription;
    (c) - Translation;
    (d) - Protein
    (D)
    (a) - Transduction;
    (b) - Translation;
    (c) - Replication;
    (d) - Protein
    digAnsr:   C
    :
  • Qstn #6
    The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :
    (A)Xenogamy
    (B)Geitonogamy
    (C)Chasmogamy
    (D)Cleistogamy
    digAnsr:   A
    :
  • Qstn #7
    DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as :
    (A)Yellow bands
    (B)Bright orange bands
    (C)Dark red bands
    (D)Bright blue bands
    digAnsr:   B
    :
  • Qstn #8
    Which of the following is an incorrect statement ?
    (A)Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles.
    (B)Microbodies are present both in plant and animal cells.
    (C)The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm.
    (D)Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm.
    digAnsr:   A
    :
  • Qstn #9
    Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
    (A)Resource partitioning
    (B)Competitive release
    (C)Mutualism
    (D)Predation
    digAnsr:   A
    :
  • Qstn #10
    Gemmae are present in:
    (A)Mosses
    (B)Pteridophytes
    (C)Some Gymnosperms
    (D)Some Liverworts
    digAnsr:   D
    :
  • Qstn #11
    Match List - I with List - II.

    List I List II
    a Protoplast fusion i Totipotency
    b Plant tissue culture ii Pomato
    c Meristem culture iii Somaclones
    d Micropropagation iv Virus free plants
    Choose the correct answer from the options given below.
    (A)
    (a) - (iii) ,
    (b) - (iv) ,
    (c) - (ii),
    (d) - (i)
    (B)
    (a) - (ii) ,
    (b) - (i) ,
    (c) - (iv),
    (d) - (iii)
    (C)
    (a) - (iii) ,
    (b) - (iv) ,
    (c) - (i),
    (d) - (ii)
    (D)
    (a) - (iv) ,
    (b) - (iii) ,
    (c) - (ii),
    (d) - (i)
    digAnsr:   B
    :
  • Qstn #12
    The production of gametes by the parents, formation of zygotes, the `` F _{1} `` and `` F _{2} `` plants, can be understood from a diagram called:
    (A)Bullet square
    (B)Punch square
    (C)Punnett square
    (D)Net square
    digAnsr:   C
    :
  • Qstn #13
    Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:
    (A)Homosorus
    (B)Heterosorus
    (C)Homosporous
    (D)Heterosporous
    digAnsr:   D
    :
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