NEET-XII-Biology

P1 year:2019

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  • Qstn #91
    The Earth Summit held in Rio de Janeiro in
    1992 was called
    (1) To reduce ``CO_2 ``emissions and global
    warming
    (2) for conservation of biodiversity and
    sustainable utilization of its benefits
    (3) to assess threat posed to native species
    by invasive weed species
    (4) for immediate steps to discontinue use of
    CFCs that were damaging the ozone layer
    digAnsr:   2
    Ans : ( 2 )
    Sol. Earth Summit (Rio Summit)-1992, called upon
    all nations to take appropriate measures for
    conservation of biodiversity and sustainable
    utilisation of its benefits
  • Qstn #92
    Colostrum the yellowish fluid, secreted by
    mother during the initial days of lactation is
    very essential to impart immunity to the new
    born infants because it contains
    (1) Natural killer cells
    (2) Monocytes
    (3) Macrophages
    (4) Immunoglobulin A
    digAnsr:   4
    Ans : ( 4 )
    Sol. Colostrum, the yellowish fluid secreted by the
    mother during initial days of lactation is very
    essential to impart immunity to the new born
    infant because it contains Immunoglobulin A.
    It will impart naturally acquired passive
    immunity to the newborn
  • Qstn #93
    Grass leaves curl inwards during very dry
    weather. Select the most appropriate reason
    from the following
    (1) Closure of stomata
    (2) Flaccidity of bulliform cells
    (3) Shrinkage of air spaces in spongy
    mesophyll
    (4) Tyloses in vessels
    digAnsr:   2
    Ans : ( 2 )
    Sol. Bulliform cells become flaccid due to water
    loss. This will make the leaves to curl inward
    to minimise water loss
  • Qstn #94
    The shorter and longer arms of a
    submetacentric chromosome are
    referred to as
    (1) s-arm and l-arm respectively
    (2) p-arm and q-arm respectively
    (3) q-arm and p-arm respectively
    (4) m-arm and n-arm respectively
    digAnsr:   2
    Ans : ( 2 )
    Sol. • Sub metacentric chromosome is
    Heterobrachial.
    • Short arm designated as 'p' arm
    (p = petite i.e. short)
    • Long arm designated as 'q' arm
  • Qstn #95
    Respiratory Quotient (RQ) value of
    tripalmitin is -
    (1) 0.9
    (2) 0.7
    (3) 0.07
    (4) 0.09
    digAnsr:   2
    Ans : ( 2 )
    Sol.
     
    2
    2
    Amount of CO released
    Respiratory Quotient
    Amount of O consumedRQ
    =
    2(C
    51
    H
    98
    O
    6
    ) + 145O
    2
    ï‚® 102CO
    2
    + 98H
    2
    O
    Tripalmitin + Energy
    2
    2
    102 CO
    RQ 0.7
    145 O
    = =
  • Qstn #96
    Which of the following is a commercial blood
    cholesterol lowering agent?
    (1) Cyclosporin A
    (2) Statin
    (3) Streptokinase
    (4) Lipases
    digAnsr:   2
    Ans : ( 2 )
    Sol. • Statin is obtained from a yeast (Fungi)
    called Monascus purpureus
    • It acts by competitively inhibiting the
    enzyme responsible for synthesis of
    cholesterol.23
  • Qstn #97
    Match the following structures with their
    respective location in organs
    (a ) Crypts of Lieberkuhn (i) Pancreas
    (b) Glisson's Capsule (ii) Duodenum
    (c) Islets of Langerhans (iii) Small intestine
    (d) Brunner's Glands (iv) Liver
    Select the correct option from the following
    (a ) (b) (c) (d)
    (1) (iii) (i) (ii) (iv)
    (2) (ii) (iv) (i) (iii)
    (3) (iii) (iv) (i) (ii)
    (4) (iii) (ii) (i) (iv)
    digAnsr:   3
    Ans : ( 3 )
    Sol. Crypts of Lieberkuhn are present in small
    intestine. Glisson's capsule is present in liver.
    Islets of langerhans constitutes the endocrine
    portion of pancreas. Brunner's glands are
    found in submucosa of duodenum.
  • Qstn #98
    Which of the following is the most important
    cause for animals and plants being driven to
    extinction?
    (1) Habitat loss and fragmentation
    (2) Drought and floods
    (3) Economic exploitation
    (4) Alien species invasion
    digAnsr:   1
    Ans : ( 1 )
    Sol. Habitat loss and fragmentation is the most
    important cause driving animals and plants to
    extinction.
    eg: Loss of tropical rainforest reducing the
    forest cover from 14 % to 6 %.
  • Qstn #99
    Which part of the brain is responsible for
    thermoregulation?
    (1) Cerebrum
    (2) Hypothalamus
    (3) Corpus callosum
    (4) Medulla oblongata
    digAnsr:   2
    Ans : ( 2 )
    Sol. Hypothalamus in the thermoregulatory centre
    of our brain. It is responsible for maintaining
    constant body temperature.
  • Qstn #100
    Consider following features
    (a ) Organ system level of organisation
    (b) Bilateral symmetry
    (c) True coelomates with segmentation of body.
    Select the correct option of animal groups
    which possess all the above characteristics
    (1) Annelida, Arthropoda and Chordata
    (2) Annelida, Arthropoda and Mollusca
    (3) Arthropoda, Mollusca and Chordata
    (4) Annelida, Mollusca and Chordata
    digAnsr:   1
    Ans : ( 1 )
    Sol. True segmentation is present in Annelida,
    Arthropoda and Chordata. They also have
    organ system level of organisation, bilateral
    symmetry and are true coelomates
  • Qstn #101
    Select the correct sequence of organs in the
    alimentary canal of cockroach starting from
    mouth
    (1) Pharynx ``\rightarrow`` Oesophagus ``\rightarrow`` Crop ``\rightarrow`` Gizzard
    ``\rightarrow`` Ileum ``\rightarrow`` Colon ``\rightarrow`` Rectum
    (2) Pharynx ``\rightarrow`` Oesophagus ``\rightarrow`` Gizzard ``\rightarrow`` Crop
    ``\rightarrow`` Ileum ``\rightarrow`` Colon ``\rightarrow`` Rectum
    (3) Pharynx ``\rightarrow`` Oesophagus ``\rightarrow`` Gizzard ``\rightarrow``
    Ileum ``\rightarrow`` Crop ``\rightarrow`` Colon ``\rightarrow`` Rectum
    (4) Pharynx ``\rightarrow`` Oesophagus ``\rightarrow`` Ileum ``\rightarrow`` Crop
    ``\rightarrow`` Gizzard ``\rightarrow`` Colon ``\rightarrow`` Rectum
    digAnsr:   1
    Ans : ( 1 )
    Sol. The correct sequence of organs in the
    alimentary canal of cockroach starting from
    mouth is :
    Pharynx  Oesophagus Crop  Gizzard 
    Ileum ï‚® Colon ï‚® Rectum
  • Qstn #102
    Which of the following pairs of gases is mainly
    responsible for green house effect?
    (1) Ozone and Ammonia
    (2) Oxygen and Nitrogen
    (3) Nitrogen and Sulphur dioxide
    (4) Carbon dioxide and Methane
    digAnsr:   4
    Ans : ( 4 )
    Sol. Relative contribution of various greenhouse
    gases to total global warming is
    • CO
    2
    = 60%
    • CH
    4
    = 20%
    24
    • CFC = 14%
    • N
    2
    O = 6%
    &implies; Therefore CO
    2
    and CH
    4
    are the major
    greenhouse gases
  • Qstn #103
    Which of the following muscular
    disorders is inherited?
    (1) Tetany
    (2) Muscular dystrophy
    (3) Myasthenia gravis
    (4) Botulism
    digAnsr:   2
    Ans : ( 2 )
    Sol. Progressive degeneration of skeletal muscle
    mostly due to genetic disorder is muscular
    dystrophy where as tetany is muscular spasm
    due to low calcium in body fluid. Myasthenia
    gravis is an anto immume disorder leading to
    paralysis of skeletal muscles. Botulism is rare
    and dangerous type of food poisoning caused
    by bacterium Clostridium Botulinum.
  • Qstn #104
    The ciliated epithelial cells are required to
    move particles or mucus in a specific
    direction. In humans, these cells are mainly
    present in
    (1) Bile duct and Bronchioles
    (2) Fallopian tubes and Pancreatic duct
    (3) Eustachian tube and Salivary duct
    (4) Bronchioles and Fallopian tubes
    digAnsr:   4
    Ans : ( 4 )
    Sol. Bronchioles and Fallopian tubes are lined with
    ciliated epithelium to move particles or mucus
    in a specific direction.