NEET-XII-Physics

Previous Year Paper year:2017

with Solutions - page 2

Note: Please signup/signin free to get personalized experience.

Note: Please signup/signin free to get personalized experience.

10 minutes can boost your percentage by 10%

Note: Please signup/signin free to get personalized experience.

 
  • Qstn #151
    A gene locus has two alleles A, a. If the
    frequency of dominant allele A is 0.4, then
    what will be the frequency of homozygous
    dominant, heterozygous and homozygous
    recessive individuals in the population?
    (1) 0.36(AA); 0.48(Aa); 0.16(aa)
    (2) 0.16(AA); 0.24(Aa); 0.36(aa)
    (3) 0.16(AA); 0.48(Aa); 0.36(aa)
    (4) 0.16(AA); 0.36(Aa); 0.48(aa)
    digAnsr:   3
    Ans : ( 3 )
    Sol. Frequency of dominant allele (say p) = 0.4
    Frequency of recessive allele (say q)
    = 1 - 0.4 = 0.6
    ∴ Frequency of homozygous dominant
    individuals (AA)
    = p2 = (0.4)2 = 0.16
    Frequency of heterozygous individuals (Aa)
    = 2pq = 2(0.4)(0.6) = 0.48
    Frequency of homozygous recessive
    individuals (aa)
    = q2 = (0.6)2 = 0.36
  • Qstn #152
    Which of the following is true for Golden
    rice?
    (1) It is Vitamin A enriched, with a gene from
    daffodil
    (2) It is pest resistant, with a gene from
    Bacillus thuringiensis
    (3) It is drought tolerant, developed using
    Agrobacterium vector
    (4) It has yellow grains, because of a gene
    introduced from a primitive variety of rice
    digAnsr:   1
    Ans : ( 1 )
    Sol. Golden rice is vitamin A enriched rice, with a
    gene from daffodil and is rich in carotene.
  • Qstn #153
    Pinus seed cannot germinate and established
    without fungal association. This is because :
    (1) its embryo is immature.
    (2) it has obligate association with
    mycorrhizae.
    (3) it has very hard seed coat.
    (4) its seeds contain inhibitors that present
    germination.
    digAnsr:   2
    Ans : ( 2 )
    Sol. Fungus associated with roots of Pinus
    increases minerals & water absorption for
    the plant by increasing surface area and in
    turn fungus gets food from plant. Therefore,
    mycorrhizal association is obligatory for Pinus
    seed germination
  • Qstn #154
    Which of the following features of genetic
    code does allow bacteria to produce human
    insulin by recombinant DNA technology?
    (1) Genetic code is not ambiguous
    (2) Genetic code is redundant
    (3) Genetic code is nearly universal
    (4) Genetic code is specific
    digAnsr:   3
    Ans : ( 3 )
    Sol. In recombinant DNA technology bacteria is
    able to produce human insulin because
    genetic code is nearly universal.
  • Qstn #155
    Which of the following sexually transmitted
    diseases is not completely curable?
    (1) Gonorrhoea
    (2) Genital warts
    (3) Genital herpes
    (4) Chlamydiasis
    digAnsr:   3
    Ans : ( 3 )
    Sol. Genital herpes is caused by type-II-herpes
    simplex virus. At present there is no cure for
    type-II-herpes simplex virus and therefore the
    disease caused, genital herpes. Other non-
    curable STIs are hepatitis-B and HIV.
  • Qstn #156
    Which of the following statements is
    incorrect?
    (1) Viroids lack a protein coat.
    (2) Viruses are obligate parasites.
    (3) Infective constituent in viruses is the
    protein coat.
    (4) Prions consist of abnormally folded
    proteins.
    digAnsr:   3
    Ans : ( 3 )
    Sol. Infective constituent in viruses is either DNA
    or RNA, not protein.33
  • Qstn #157
    Match the following organisms with their
    respective characteristics :
    (a ) Pila (i) Flame cells
    (b) Bombyx (ii) Comb plates
    (c) Pleurobrachia (iii) Radula
    (d) Taenia (iv) Malpighian tubules
    Select the correct option from the following :
    ( a ) (b) (c) (d)
    (1) (iii) (ii) (i) (iv)
    (2) (iii) (iv) (ii) (i)
    (3) (ii) (iv) (iii) (i)
    (4) (iii) (ii) (iv) (i)
    digAnsr:   2
    Ans : ( 2 )
    Sol. (a) Pila is a Mollusc. The mouth contains a file
    - like rasping organ for feeding called
    radula.
    (b) Bombyx is an Arthropod. In Bombyx
    excretion takes place through malpighan
    tubules.
    (c) Pleurobrachia is Ctenophore. The body
    bears eight external rows of ciliated comb
    plates, which help in locomotion.
    (d) Taenia is a platyhelminth specialised cells
    called flame cells helps in osmoregulation
    and excretion
  • Qstn #158
    Expressed Sequence Tags (ESTs) refers to :
    (1) Genes expressed as RNA
    (2) Polypeptide expression
    (3) DNA polymorphism
    (4) Novel DNA sequences
    digAnsr:   1
    Ans : ( 1 )
    Sol. Expressed Sequence Tags (ESTs) are DNA
    sequences (genes) that are expressed as
    mRNA for protein synthesis. These are used in
    human Genome Project.
  • Qstn #159
    Which is of the following statements is
    incorrect?
    (1) Morels and truffles are edible delicacies.
    (2) Claviceps is a source of many alkaloids
    and LSD.
    (3) Conidia are produced exogenously and
    ascospores endogenously.
    (4) Yeasts have filamentous bodies with long
    thread-like hyphae.
    digAnsr:   4
    Ans : ( 4 )
    Sol. Yeast is an unicellular sac fungus. It lacks
    filamentous structure or hyphae.
  • Qstn #160
    Match Column - I with Column - II
    Column- I Column - II
    (a ) Saprophyte (i) Symbiotic association of fungi with plant roots
    (b) Parasite (ii) Decomposition of dead organic materials
    (c) Lichens (iii) Living on living plants or animals
    (d) Mycorrhiza ( iv) Symbiotic association of algae and fungi
    Choose the correct Ans. from the option
    given below
    (a ) (b) (c) (d)
    (1) (i) (ii) (iii) (iv)
    (2) (iii) (ii) (i) (iv)
    (3) (ii) (i) (iii) (iv)
    (4) (ii) (iii) (iv) ( i)
    digAnsr:   4
    Ans : ( 4 )
    Sol. Saprophytes - Decomposition of dead
    organic materials
    Parasites - Grow on/in living plants and
    animals
    Lichens - Symbiotic association of
    algae and fungi
    Mycorrhiza - Symbiotic association of fungi
    with plant roots
  • Qstn #161
    Which of the following glucose transporters is
    insulin-dependent?
    (1) GLUT I
    (2) GLUT II
    (3) GLUT III
    (4) GLUT IV
    digAnsr:   4
    Ans : ( 4 )
    Sol. GLUT-IV is insulin dependent and is
    responsible for majority of glucose transport
    into muscle and adipose cells in anabolic
    conditions. Whereas GLUT-I is insulin
    independent and is widely distributed in
    different tissues.
    34
  • Qstn #162
    Which of the following immune responses is
    responsible for rejection of kidney graft?
    (1) Auto-immune response
    (2) Humoral immune response
    (3) Inflammatory immune response
    (4) Cell-mediated immune response
    digAnsr:   4
    Ans : ( 4 )
    Sol. The body is able to differentiate self and
    nonself and the cell-mediated response is
    responsible for graft rejection.
  • Qstn #163
    Use of an artificial kidney during hemodialysis
    may result in :
    (a ) Nitrogenous waste build-up in the body
    (b) Non-elimination of excess potassium ions
    (c) Reduced absorption of calcium ions from
    gastro-intestinal tract
    (d) Reduced RBC production
    Which of the following options is the most
    appropriate?
    (1) (a) and (b) are correct
    (2) (b) and (c) are correct
    (3) (c) and (d) are correct
    (4) (a) and (d) are correct
    digAnsr:   3
    Ans : ( 3 )
    Sol. a and b statements are incorrect because
    dialysis eliminates urea and potassium from
    the body whereas, c and d are correct. As
    phosphate ions are eliminated during dialysis,
    along with that calcium ions are also
    eliminated. So, there will be reduced
    absorption of calcium ions from
    gastrointestinal tract. RBC production will be
    reduced, due to reduced erythropoietin
    hormone.
  • Qstn #164
    Which of the following statements is
    correct?
    (1) Cornea is an external, transparent and
    protective proteinacious covering of the
    eye-ball.
    (2) Cornea consists of dense connective
    tissue of elastin and can repair itself.
    (3) Cornea is convex, transparent layer which
    is highly vascularised.
    (4) Cornea consists of dense matrix of
    collagen and is the most sensitive portion
    the eye.
    digAnsr:   4
    Ans : ( 4 )
    Sol. Cornea consists of dense matrix of collagen
    and corneal epithelium. It is the most
    sensitive part of eye.
  • Qstn #165
    The frequency of recombination between
    gene pairs on the same chromosome as a
    measure of the distance between genes was
    explained by :
    (1) T.H. Morgan
    (2) Gregor J. Mendel
    (3) Alfred Sturtevant
    (4) Sutton Boveri
    digAnsr:   3
    Ans : ( 3 )
    Sol. Alfred Sturtevant explained chromosomal
    mapping on the basis of recombination
    frequency which is directly proportional to
    distance between two genes on same
    chromosome