BiologyQ101–106 of 196 questions
Page 3 of 3 · English
101
BiologyEasyMCQAIPMT · 1994
Which of the following pairs is not correctly matched?
A
Vitamin $B_6 - \text{Beriberi}$
B
Vitamin $C - \text{Scurvy}$
C
Vitamin $B_3 - \text{Pellagra}$
D
Vitamin $B_{12} - \text{Pernicious anemia}$
Solution
(A) The correct answer is $A$.
Vitamin $B_6$ (Pyridoxine) deficiency leads to conditions like dermatitis, glossitis, and peripheral neuropathy, not Beriberi.
Beriberi is caused by the deficiency of Vitamin $B_1$ (Thiamine).
Vitamin $C$ deficiency causes Scurvy.
Vitamin $B_3$ (Niacin) deficiency causes Pellagra.
Vitamin $B_{12}$ (Cyanocobalamin) deficiency causes Pernicious anemia.
Vitamin $B_6$ (Pyridoxine) deficiency leads to conditions like dermatitis, glossitis, and peripheral neuropathy, not Beriberi.
Beriberi is caused by the deficiency of Vitamin $B_1$ (Thiamine).
Vitamin $C$ deficiency causes Scurvy.
Vitamin $B_3$ (Niacin) deficiency causes Pellagra.
Vitamin $B_{12}$ (Cyanocobalamin) deficiency causes Pernicious anemia.
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102
BiologyEasyMCQAIPMT · 1994
The oxygen dissociation curve of hemoglobin is . . . . . . .
A
Sigmoid
B
Hyperbolic
C
Linear
D
Hypobolic
Solution
(A) The oxygen dissociation curve is a plot showing the relationship between the partial pressure of oxygen $(pO_2)$ and the percentage saturation of hemoglobin with oxygen.
This curve is $Sigmoid$ ($S$-shaped) in nature.
This shape is due to the cooperative binding of oxygen to the four heme groups of the hemoglobin molecule,where the binding of one oxygen molecule increases the affinity of the remaining heme groups for oxygen.
This curve is $Sigmoid$ ($S$-shaped) in nature.
This shape is due to the cooperative binding of oxygen to the four heme groups of the hemoglobin molecule,where the binding of one oxygen molecule increases the affinity of the remaining heme groups for oxygen.
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103
BiologyMediumMCQAIPMT · 1994
The path of air during respiration is:
A
Bronchi - Lungs - Larynx - Pharynx - Alveoli
B
Nose - Larynx - Pharynx - Bronchi - Alveoli - Bronchioles
C
External nostrils - Pharynx - Larynx - Trachea - Bronchi - Bronchioles - Alveoli
D
Nose - Mouth - Lungs
Solution
(C) The human respiratory system follows a specific anatomical pathway for the movement of air.
$1$. Air enters through the $External$ $nostrils$.
$2$. It passes into the $Pharynx$ (the common passage for food and air).
$3$. It then enters the $Larynx$ (the sound box).
$4$. From the $Larynx$,air moves into the $Trachea$ (windpipe).
$5$. The $Trachea$ divides into $Bronchi$,which further divide into smaller $Bronchioles$.
$6$. Finally,the air reaches the $Alveoli$,where the actual exchange of gases occurs.
$1$. Air enters through the $External$ $nostrils$.
$2$. It passes into the $Pharynx$ (the common passage for food and air).
$3$. It then enters the $Larynx$ (the sound box).
$4$. From the $Larynx$,air moves into the $Trachea$ (windpipe).
$5$. The $Trachea$ divides into $Bronchi$,which further divide into smaller $Bronchioles$.
$6$. Finally,the air reaches the $Alveoli$,where the actual exchange of gases occurs.
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104
BiologyEasyMCQAIPMT · 1994
The 'dubb' heart sound is produced at the time of closure of:
A
Semilunar valves
B
Bicuspid valve
C
Tricuspid valve
D
Both $(b)$ and $(c)$
Solution
(A) The heart produces two primary sounds during the cardiac cycle,often described as 'lubb' and 'dubb'.
$1$. The first heart sound,'lubb',is associated with the closure of the atrioventricular valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.
$2$. The second heart sound,'dubb',is associated with the closure of the semilunar valves (aortic and pulmonary valves) at the beginning of ventricular diastole.
Therefore,the 'dubb' sound is produced by the closure of the semilunar valves.
$1$. The first heart sound,'lubb',is associated with the closure of the atrioventricular valves (tricuspid and bicuspid valves) at the beginning of ventricular systole.
$2$. The second heart sound,'dubb',is associated with the closure of the semilunar valves (aortic and pulmonary valves) at the beginning of ventricular diastole.
Therefore,the 'dubb' sound is produced by the closure of the semilunar valves.
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105
BiologyEasyMCQAIPMT · 1994
Closed circulatory system is found in $..........$.
A
Cockroach
B
Tadpole/Fish
C
Mosquito
D
Housefly
Solution
(B) In a closed circulatory system,blood is pumped by the heart into vessels that are separate from the interstitial fluid of the body.
Vertebrates,such as fish,amphibians (tadpoles),reptiles,birds,and mammals,possess a closed circulatory system.
In contrast,arthropods like cockroaches,mosquitoes,and houseflies possess an open circulatory system,where blood flows into open spaces called sinuses or hemocoel.
Vertebrates,such as fish,amphibians (tadpoles),reptiles,birds,and mammals,possess a closed circulatory system.
In contrast,arthropods like cockroaches,mosquitoes,and houseflies possess an open circulatory system,where blood flows into open spaces called sinuses or hemocoel.
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106
BiologyEasyMCQAIPMT · 1994
The pacemaker of the heart is known as ........
A
$AV$ node
B
Bundle of His
C
$SA$ node
D
Purkinje fibers
Solution
(C) The heart's rhythmic contraction is initiated by a specialized patch of cardiac muscle fibers called the $SA$ node (Sinoatrial node).
It is located in the right upper corner of the right atrium.
Because it generates the action potential that sets the pace for the heart's contraction,it is known as the natural pacemaker of the heart.
It is located in the right upper corner of the right atrium.
Because it generates the action potential that sets the pace for the heart's contraction,it is known as the natural pacemaker of the heart.
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