NEET-XII-Biology

P1 year:2019

with Solutions - page 2

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  • Qstn #105
    Match the Column-I with Column-II
    Column-I Column-II
    (a ) P - wave (i) Depolarisation of ventricles
    (b) QRS complex (ii) Repolarisation of ventricles
    (c) T - wave (iii) Coronary ischemia
    (d) Reduction in the (iv) Depolarisation of size of T-wave atria
    (v) Repolarisation ofatria
    Select the correct option.
    ( a ) (b) ( c ) (d)
    (1) (iv) (i) (ii) (iii)
    (2) (iv) (i) (ii) (v)
    (3) (ii) (i) (v) (iii)
    (4) (ii) (iii) (v) (iv)
    digAnsr:   1
    Ans : ( 1 )
    Sol. In ECG P-wave represents depolarisation of
    atria. QRS complex represents depolarisation
    of ventricles. T-wave represents
    repolarisation of ventricle i.e. return from
    excited to normal state. Reduction in the size
    of T-wave i.e. if the T-wave represents
    insufficient supply of oxygen i.e. coronary
    ischaemia.
  • Qstn #106
    Which one of the following is not a method of
    in situ conservation of biodiversity?
    (1) Biosphere Reserve
    (2) Wildlife Sanctuary
    (3) Botanical Garden
    (4) Sacred Grove
    digAnsr:   3
    Ans : ( 3 )
    Sol. Botanical garden - ex - situ conservation (off-
    site conservation) i.e. living plants (flora) are
    conserved in human managed system.
  • Qstn #107
    In a species, the weight of newborn ranges
    from 2 to 5 kg. 97% of the newborn with an
    average weight between 3 to 3.3 kg survive
    whereas 99% of the infants born with weight
    from 2 to 2.5 kg or 4.5 to 5 kg die. Which type
    of selection process is taking place?
    (1) Directional Selection
    (2) Stabilizing Selection
    (3) Disruptive Selection
    (4) Cyclical Selection
    digAnsr:   2
    Ans : ( 2 )
    Sol. The given data shows stabilising selection as
    most of the newborn having average weight
    between 3 to 3.3 kg survive and babies with
    less and more weight have low survival rate.
  • Qstn #108
    The correct sequence of phases of cell cycle
    is
    (1) M ``\rightarrow`` ``G_1`` ``\rightarrow`` ``G_2`` ``\rightarrow`` S
    (2) ``G_1`` ``\rightarrow`` ``G_2`` ``\rightarrow`` S ``\rightarrow`` M
    (3) S ``\rightarrow`` ``G_1````\rightarrow````G_2`` ``\rightarrow`` M
    (4) ``G_1`` ``\rightarrow`` S ``\rightarrow`` ``G_2`` ``\rightarrow`` M
    digAnsr:   4
    Ans : ( 4 )
    Sol. The correct sequence of phases of cell cycle is
    G
    1
    ï‚® S ï‚® G
    2
    ï‚® M
  • Qstn #109
    How does steroid hormone influence the
    cellular activities?
    (1) Changing the permeability of the cell
    membrane
    (2) Binding to DNA and forming a gene-
    hormone complex
    (3) Activating cyclic AMP located on the cell
    membrane
    (4) Using aquaporin channels as second
    messenger
    digAnsr:   2
    Ans : ( 2 )
    Sol. Steroid hormones directly enter into the cell
    and bind with intracellular receptors in
    nucleus to form hormone receptor complex.
    Hormone receptor complex interacts with the
    genome
  • Qstn #110
    Which of the following statements is not
    correct?
    (1) Lysosomes have numerous hydrolytic
    enzymes
    (2) The hydrolytic enzymes of lysosomes are
    active under acidic pH
    (3) Lysosomes are membrane bound
    structures
    (4) Lysosomes are formed by the process of
    packaging in the endoplasmic reticulum
    digAnsr:   4
    Ans : ( 4 )
    Sol. Lysosomes bud off from trans face of Golgi
    bodies.
    Precursor of lysosomal enzymes are
    synthesised by RER and then send to Golgi
    bodies for further processing.
  • Qstn #111
    Which one of the following statements
    regarding post-fertilization development in
    flowering plants is incorrect?
    (1) Ovary develops into fruit
    (2) Zygote develops into embryo
    (3) Central cell develops into endosperm
    (4) Ovules develop into embryo sac
    digAnsr:   4
    Ans : ( 4 )
    Sol. Following are the post-fertilisation changes.
    • Ovule  Seed
    • Ovary  Fruit
    • Zygote  Embryo
    • Central cell  Endosperm
  • Qstn #112
    Concanavalin A is
    (1) an alkaloid
    (2) an essential oil
    (3) a lectin
    (4) a pigment
    digAnsr:   3
    Ans : ( 3 )
    Sol. Concanavalin A is a secondary metabolite e.g
    is lectin, it has the property to agglutinates
    RBCs.
  • Qstn #113
    Which one of the following equipments is
    essentially required for growing microbes on
    a large scale, for industrial production of
    enzymes?
    (1) BOD incubator
    (2) Sludge digester
    (3) Industrial oven
    (4) Bioreactor
    digAnsr:   4
    Ans : ( 4 )
    S o l . To produce enzyme in large quantity
    equipment required are bioreactors. Large
    scale production involves use of
    bioreactors.
  • Qstn #114
    Consider the following statement :
    (A) Coenzyme or metal ion that is tightly
    bound to enzyme protein is called
    prosthetic group.
    (B) A complete catalytic active enzyme with
    its bound prosthetic group is called
    apoenzyme.
    Select the correct option.
    (1) Both (A) and (B) are true.
    (2) (A) is true but (B) is false.
    (3) Both (A) and (B) are false.
    (4) (A) is false but (B) is true.
    digAnsr:   2
    Ans : ( 2 )
    Sol. Coenzyme or metal ion that is tightly bound to
    enzyme protein is called prosthetic group. A
    complete catalytic active enzyme with its
    bound prosthetic group is called holoenzyme.
    26
  • Qstn #115
    Purines found both in DNA and RNA are
    (1) Adenine and thymine
    (2) Adenine and guanine
    (3) Guanine and cytosine
    (4) Cytosine and thymine
    digAnsr:   2
    Ans : ( 2 )
    Sol. Purines found both in DNA and RNA are
    Adenine and guanine
  • Qstn #116
    Select the correct sequence for transport of
    sperm cells in male reproductive system.
    (1) Testis ``\rightarrow`` Epididymis ``\rightarrow`` Vasa efferentia ``\rightarrow``
    Rete testis ``\rightarrow`` Inguinal canal ``\rightarrow`` Urethra
    (2) Seminiferous tubules ``\rightarrow`` Rete testis ``\rightarrow``
    Vasa efferentia ``\rightarrow`` Epididymis ``\rightarrow`` Vas
    deferens ``\rightarrow`` Ejaculatory duct ``\rightarrow`` Urethra ``\rightarrow``
    Urethral meatus
    (3) Seminiferous tubules ``\rightarrow`` Vasa efferentia ``\rightarrow``
    Epididymis ``\rightarrow`` Inguinal canal ``\rightarrow`` Urethra
    (4) Testis ``\rightarrow`` Epididymis ``\rightarrow`` Vasa efferentia ``\rightarrow``
    Vas deferens ``\rightarrow`` Ejaculatory duct ``\rightarrow``
    Inguinal canal ``\rightarrow`` Urethra ``\rightarrow`` Urethral meatus
    digAnsr:   2
    Ans : ( 2 )
    Sol. The correct sequence for transport of sperm
    cells in male reproductive system is
    Seminiferous tubules ï‚® Rete testis ï‚® Vasa
    efferentia ï‚® Epididymis ï‚® Vas deferens ï‚®
    Ejaculatory duct ï‚® Urethra ï‚® Urethral
    meatus
  • Qstn #117
    Match the hominids with their correct brain
    size :
    (a ) Homo habilis (i) 900 cc
    (b) Homo neanderthalensis (ii) 1350 cc
    (c) Homo erectus (iii) 650-800 cc
    (d) Homo sapiens (iv) 1400 cc
    Select the correct option.
    (a ) (b) (c) (d)
    (1) (iii) (i) (iv) (ii)
    (2) (iii) (ii) (i) (iv)
    (3) (iii) (iv) (i) (ii)
    (4) (iv) (iii) (i) (ii)
    digAnsr:   3
    Ans : ( 3 )
    Sol. The correct match of hominids and their brain
    sizes are :
    Homo habilis — 650-800 cc
    Homo neanderthalensis — 1400 cc
    Homo erectus — 900 cc
    Homo sapiens — 1350 cc
  • Qstn #118
    Variations caused by mutation, as proposed by
    Hugo de Vries are
    (1) random and directional
    (2) random and directionless
    (3) small and directional
    (4) small and directionless
    digAnsr:   2
    Ans : ( 2 )
    Sol. According to Hugo de Vries, mutations are
    random and directionless.
    Devries believed mutation caused speciation
    and hence called saltation (single step large
    mutation).
  • Qstn #119
    Which of the following pair of organelles does
    not contain DNA?
    (1) Mitochondria and Lysosomes
    (2) Chloroplast and Vacuoles
    (3) Lysosomes and Vacuoles
    (4) Nuclear envelope and Mitochondria
    digAnsr:   3
    Ans : ( 3 )
    Sol. Lysosomes and Vacuoles do not have DNA.