NEET-XII-Biology
P1 year:2019
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- Qstn #91The 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 layerdigAnsr: 2Ans : ( 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 #92Colostrum 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 AdigAnsr: 4Ans : ( 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 #93Grass 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 vesselsdigAnsr: 2Ans : ( 2 )
Sol. Bulliform cells become flaccid due to water
loss. This will make the leaves to curl inward
to minimise water loss
- Qstn #94The 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 respectivelydigAnsr: 2Ans : ( 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 #95Respiratory Quotient (RQ) value of
tripalmitin is -
(1) 0.9
(2) 0.7
(3) 0.07
(4) 0.09digAnsr: 2Ans : ( 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 #96Which of the following is a commercial blood
cholesterol lowering agent?
(1) Cyclosporin A
(2) Statin
(3) Streptokinase
(4) LipasesdigAnsr: 2Ans : ( 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 #97Match 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: 3Ans : ( 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 #98Which 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 invasiondigAnsr: 1Ans : ( 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 #99Which part of the brain is responsible for
thermoregulation?
(1) Cerebrum
(2) Hypothalamus
(3) Corpus callosum
(4) Medulla oblongatadigAnsr: 2Ans : ( 2 )
Sol. Hypothalamus in the thermoregulatory centre
of our brain. It is responsible for maintaining
constant body temperature.
- Qstn #100Consider 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 ChordatadigAnsr: 1Ans : ( 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 #101Select 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`` RectumdigAnsr: 1Ans : ( 1 )
Sol. The correct sequence of organs in the
alimentary canal of cockroach starting from
mouth is :
Pharynx ï‚® Oesophagus ï‚®ï€ Crop ï‚® Gizzard ï‚®
Ileum ï‚® Colon ï‚® Rectum
- Qstn #102Which 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 MethanedigAnsr: 4Ans : ( 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 #103Which of the following muscular
disorders is inherited?
(1) Tetany
(2) Muscular dystrophy
(3) Myasthenia gravis
(4) BotulismdigAnsr: 2Ans : ( 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 #104The 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 tubesdigAnsr: 4Ans : ( 4 )
Sol. Bronchioles and Fallopian tubes are lined with
ciliated epithelium to move particles or mucus
in a specific direction.