NEET-XII-Biology
P1 year:2019
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- Qstn #105Match 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: 1Ans : ( 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 #106Which 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 GrovedigAnsr: 3Ans : ( 3 )
Sol. Botanical garden - ex - situ conservation (off-
site conservation) i.e. living plants (flora) are
conserved in human managed system.
- Qstn #107In 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 SelectiondigAnsr: 2Ans : ( 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 #108The 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`` MdigAnsr: 4Ans : ( 4 )
Sol. The correct sequence of phases of cell cycle is
G
1
ï‚® S ï‚® G
2
ï‚® M
- Qstn #109How 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
messengerdigAnsr: 2Ans : ( 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 #110Which 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 reticulumdigAnsr: 4Ans : ( 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 #111Which 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 sacdigAnsr: 4Ans : ( 4 )
Sol. Following are the post-fertilisation changes.
• Ovule  Seed
• Ovary  Fruit
• Zygote  Embryo
• Central cell  Endosperm
- Qstn #112Concanavalin A is
(1) an alkaloid
(2) an essential oil
(3) a lectin
(4) a pigmentdigAnsr: 3Ans : ( 3 )
Sol. Concanavalin A is a secondary metabolite e.g
is lectin, it has the property to agglutinates
RBCs.
- Qstn #113Which 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) BioreactordigAnsr: 4Ans : ( 4 )
S o l . To produce enzyme in large quantity
equipment required are bioreactors. Large
scale production involves use of
bioreactors.
- Qstn #114Consider 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: 2Ans : ( 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 #115Purines found both in DNA and RNA are
(1) Adenine and thymine
(2) Adenine and guanine
(3) Guanine and cytosine
(4) Cytosine and thyminedigAnsr: 2Ans : ( 2 )
Sol. Purines found both in DNA and RNA are
Adenine and guanine
- Qstn #116Select 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 meatusdigAnsr: 2Ans : ( 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 #117Match 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: 3Ans : ( 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 #118Variations 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 directionlessdigAnsr: 2Ans : ( 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 #119Which 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 MitochondriadigAnsr: 3Ans : ( 3 )
Sol. Lysosomes and Vacuoles do not have DNA.