BiologyQ1–9 of 9 questions
Page 1 of 1 · English
1
BiologyMediumMCQAIIMS · 1988
In $Pteridophytes$ / $Dryopteris$,meiosis occurs at the time of:
A
Gamete formation
B
Spore formation
C
Formation of prothallus
D
Formation of sex organs
Solution
(B) In $Pteridophytes$ like $Dryopteris$,the main plant body is a sporophyte $(2n)$.
Inside the sporangium,specialized cells called spore mother cells $(2n)$ undergo meiosis (reduction division) to produce haploid $(n)$ spores.
These spores germinate to form the prothallus (gametophyte).
Therefore,meiosis occurs at the time of spore formation.
Inside the sporangium,specialized cells called spore mother cells $(2n)$ undergo meiosis (reduction division) to produce haploid $(n)$ spores.
These spores germinate to form the prothallus (gametophyte).
Therefore,meiosis occurs at the time of spore formation.
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2
BiologyMediumMCQAIIMS · 1988
Thrombosis in which coronary artery is met most frequently in?
A
Right coronary artery
B
Left anterior descending artery
C
Left circumflex coronary artery
D
Right circumflex coronary artery
Solution
(B) Thrombosis (the formation of a blood clot within a blood vessel) occurs most frequently in the $Left$ $anterior$ $descending$ $(LAD)$ artery.
This artery is a branch of the left coronary artery and supplies a significant portion of the left ventricle,which is the primary pumping chamber of the heart.
Due to its anatomical position and the high flow dynamics,it is the most common site for atherosclerotic plaque rupture and subsequent thrombus formation,leading to myocardial infarction.
This artery is a branch of the left coronary artery and supplies a significant portion of the left ventricle,which is the primary pumping chamber of the heart.
Due to its anatomical position and the high flow dynamics,it is the most common site for atherosclerotic plaque rupture and subsequent thrombus formation,leading to myocardial infarction.
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3
BiologyEasyMCQAIIMS · 1988
The longest visceral muscle cell is present in
A
Vas deferens
B
Normal uterus
C
Pregnant uterus
D
Abdomen
Solution
(C) Visceral muscles are also known as smooth muscles. The longest smooth muscle cells are found in the wall of the uterus of a pregnant female. During pregnancy,these cells undergo significant hypertrophy (increase in size) to accommodate the growing fetus.
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4
BiologyEasyMCQAIIMS · 1988
Cyanosis refers to:
A
Bluish colouration of the body
B
Reddish colouration of the body
C
Pale colouration of the body
D
Goose flesh of the body
Solution
(A) Cyanosis is a medical condition characterized by a bluish or purplish discolouration of the skin and mucous membranes.
It occurs due to an abnormally low concentration of oxygen in the blood (hypoxemia) or poor circulation.
When blood is deoxygenated,it appears darker,which manifests as a blue tint on the skin,particularly in areas like the lips,fingers,and toes.
It occurs due to an abnormally low concentration of oxygen in the blood (hypoxemia) or poor circulation.
When blood is deoxygenated,it appears darker,which manifests as a blue tint on the skin,particularly in areas like the lips,fingers,and toes.
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5
BiologyMediumMCQAIIMS · 1988
$A$ substance responsible for making the $stratum \text{ } lucidum$ cells of the epidermis of the skin of a rabbit transparent is:
A
Rhodopsin
B
Eleiden
C
Keratohyaline
D
Luciferin
Solution
(B) The correct answer is $B$.
In the $stratum \text{ } lucidum$ layer of the epidermis, $keratohyaline$ granules are dissolved and transformed into a protein called $eleiden$.
$Eleiden$ is a clear, oily substance that makes the cells appear semitransparent, shiny, and waterproof.
In the $stratum \text{ } lucidum$ layer of the epidermis, $keratohyaline$ granules are dissolved and transformed into a protein called $eleiden$.
$Eleiden$ is a clear, oily substance that makes the cells appear semitransparent, shiny, and waterproof.
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6
BiologyMediumMCQAIIMS · 1988
Which of the following drugs inhibits metamorphosis in frogs?
A
Paracetamol
B
Penicillin
C
Thiourea
D
Barbiturates
Solution
(C) Thiourea is an antithyroid drug that inhibits the synthesis of thyroid hormones. Since thyroid hormones are essential for the process of metamorphosis in frogs,the administration of thiourea effectively inhibits or blocks this developmental transformation.
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7
BiologyEasyMCQAIIMS · 1988
The test for 'syphilis' was developed by
A
Robert Koch
B
Edward Jenner
C
Wasserman
D
Louis Pasteur
Solution
(C) The test for 'syphilis' is known as the $Wassermann$ test.
It was developed by the German bacteriologist August von $Wassermann$ in $1906$.
This test is a complement fixation test used for the diagnosis of $syphilis$,a sexually transmitted infection caused by the bacterium $Treponema$ $pallidum$.
It was developed by the German bacteriologist August von $Wassermann$ in $1906$.
This test is a complement fixation test used for the diagnosis of $syphilis$,a sexually transmitted infection caused by the bacterium $Treponema$ $pallidum$.
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8
BiologyEasyMCQAIIMS · 1988
'Bacillary dysentery' is caused by
A
Salmonella
B
Shigella
C
Proteus
D
Entamoeba
Solution
(B) Bacillary dysentery is an infectious disease caused by bacteria of the genus $Shigella$.
These bacteria infect the lining of the large intestine, leading to inflammation and symptoms such as diarrhea, fever, and stomach cramps.
$Salmonella$ is typically associated with typhoid fever, $Proteus$ is often a urinary tract pathogen, and $Entamoeba$ (specifically $Entamoeba$ $\text{histolytica}$) causes amoebic dysentery, which is a protozoan infection, not a bacterial one.
These bacteria infect the lining of the large intestine, leading to inflammation and symptoms such as diarrhea, fever, and stomach cramps.
$Salmonella$ is typically associated with typhoid fever, $Proteus$ is often a urinary tract pathogen, and $Entamoeba$ (specifically $Entamoeba$ $\text{histolytica}$) causes amoebic dysentery, which is a protozoan infection, not a bacterial one.
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9
BiologyEasyMCQAIIMS · 1988
Which test confirms the scarlet fever?
A
Dick test
B
$ECG$
C
$UTI$ test
D
Widal test
Solution
(A) The $Dick$ test is a diagnostic test used to determine susceptibility to scarlet fever,caused by the bacterium $Streptococcus$ $pyogenes$.
In this test,a small amount of erythrogenic toxin is injected intradermally.
If the person is susceptible,a red spot appears at the site of injection,confirming the presence of the condition or susceptibility to it.
In this test,a small amount of erythrogenic toxin is injected intradermally.
If the person is susceptible,a red spot appears at the site of injection,confirming the presence of the condition or susceptibility to it.
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