NEET-XII-Physics
Previous Year Paper year:2017
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- Qstn #151A 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: 3Ans : ( 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 #152Which 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 ricedigAnsr: 1Ans : ( 1 )
Sol. Golden rice is vitamin A enriched rice, with a
gene from daffodil and is rich in carotene.
- Qstn #153Pinus 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: 2Ans : ( 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 #154Which 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 specificdigAnsr: 3Ans : ( 3 )
Sol. In recombinant DNA technology bacteria is
able to produce human insulin because
genetic code is nearly universal.
- Qstn #155Which of the following sexually transmitted
diseases is not completely curable?
(1) Gonorrhoea
(2) Genital warts
(3) Genital herpes
(4) ChlamydiasisdigAnsr: 3Ans : ( 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 #156Which 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: 3Ans : ( 3 )
Sol. Infective constituent in viruses is either DNA
or RNA, not protein.33
- Qstn #157Match 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: 2Ans : ( 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 #158Expressed Sequence Tags (ESTs) refers to :
(1) Genes expressed as RNA
(2) Polypeptide expression
(3) DNA polymorphism
(4) Novel DNA sequencesdigAnsr: 1Ans : ( 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 #159Which 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: 4Ans : ( 4 )
Sol. Yeast is an unicellular sac fungus. It lacks
filamentous structure or hyphae.
- Qstn #160Match 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: 4Ans : ( 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 #161Which of the following glucose transporters is
insulin-dependent?
(1) GLUT I
(2) GLUT II
(3) GLUT III
(4) GLUT IVdigAnsr: 4Ans : ( 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 #162Which 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 responsedigAnsr: 4Ans : ( 4 )
Sol. The body is able to differentiate self and
nonself and the cell-mediated response is
responsible for graft rejection.
- Qstn #163Use 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 correctdigAnsr: 3Ans : ( 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 #164Which 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: 4Ans : ( 4 )
Sol. Cornea consists of dense matrix of collagen
and corneal epithelium. It is the most
sensitive part of eye.
- Qstn #165The 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 BoveridigAnsr: 3Ans : ( 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