BiologyQ1–10 of 10 questions
Page 1 of 1 · English
1
BiologyMediumMCQAIIMS · 1994
The primitive type of stamens are found in the flowers of which family?
A
Liliaceae
B
Malvaceae
C
Gramineae/Poaceae
D
Degeneriaceae/Magnoliaceae
Solution
(D) Primitive stamens are characterized by being broad,leaf-like,and poorly differentiated into filament and anther.
These types of stamens are considered ancestral or primitive features in angiosperms.
Such stamens are typically found in families like $Degeneriaceae$ and $Magnoliaceae$,which are considered basal angiosperms.
These types of stamens are considered ancestral or primitive features in angiosperms.
Such stamens are typically found in families like $Degeneriaceae$ and $Magnoliaceae$,which are considered basal angiosperms.
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2
BiologyMediumMCQAIIMS · 1994
The filaments associated with cilia and flagella are constituted by
A
Microtubules
B
Microfilaments
C
Microfibrils
D
Microvilli
Solution
(A) Cilia and flagella are hair-like outgrowths of the cell membrane.
Their core,called the axoneme,possesses a number of microtubules running parallel to the long axis.
The axoneme usually has nine pairs of doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules.
This arrangement is known as the $9+2$ array.
Their core,called the axoneme,possesses a number of microtubules running parallel to the long axis.
The axoneme usually has nine pairs of doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules.
This arrangement is known as the $9+2$ array.
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3
BiologyMediumMCQAIIMS · 1994
The membrane-bound enzyme involved in the Kreb's cycle is:
A
Malate dehydrogenase
B
Fumarase
C
cis-Aconitase
D
Succinate dehydrogenase
Solution
(D) The correct answer is $D$.
Succinate dehydrogenase is the only enzyme of the Kreb's cycle that is embedded in the inner mitochondrial membrane.
It acts as a mitochondrial marker enzyme and functions as Complex $II$ of the electron transport chain.
Succinate dehydrogenase is the only enzyme of the Kreb's cycle that is embedded in the inner mitochondrial membrane.
It acts as a mitochondrial marker enzyme and functions as Complex $II$ of the electron transport chain.
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4
BiologyMediumMCQAIIMS · 1994
The hormone which was discovered through the 'foolish seedling' disease of rice is
A
Indole-$3$-acetic acid
B
Ethylene
C
Gibberellic acid
D
Kinetin
Solution
(C) The 'foolish seedling' disease (bakanae disease) of rice was caused by the fungus $Gibberella$ $fujikuroi$.
Japanese scientists $E.$ $Kurosawa$ reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus.
The active substance was later identified and crystallized as $Gibberellic$ $acid$ $(GA_3)$.
Japanese scientists $E.$ $Kurosawa$ reported the appearance of symptoms of the disease in uninfected rice seedlings when they were treated with sterile filtrates of the fungus.
The active substance was later identified and crystallized as $Gibberellic$ $acid$ $(GA_3)$.
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5
BiologyEasyMCQAIIMS · 1994
The bacterial genome refers to the total number of genes located upon a
A
Haploid set of chromosomes
B
Diploid set of chromosomes
C
Tetraploid set of chromosomes
D
Hexaploid set of chromosomes
Solution
(A) Bacteria are prokaryotic organisms that typically possess a single,circular chromosome. Since they do not undergo meiosis and do not have homologous pairs of chromosomes like eukaryotes,their genetic material is considered haploid. Therefore,the bacterial genome refers to the total number of genes located upon a haploid set of chromosomes.
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6
BiologyMediumMCQAIIMS · 1994
The bacteria grown in the medium containing $S^{35}$ as the lone source of sulphur show its incorporation into
A
$DNA$
B
Protein
C
$RNA$
D
None of the above
Solution
(B) Sulphur is a key component of specific amino acids such as cysteine,cystine,and methionine.
Since these amino acids are the building blocks of proteins,bacteria grown in a medium containing radioactive $S^{35}$ will incorporate this isotope into their proteins.
Since these amino acids are the building blocks of proteins,bacteria grown in a medium containing radioactive $S^{35}$ will incorporate this isotope into their proteins.
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7
BiologyMediumMCQAIIMS · 1994
By tissue culture,an indefinite number of plants from a small amount of parental tissue can be obtained. This technique is of great economic importance as
A
New species can be generated
B
Through somaclonal variation,a large number of variants can be isolated
C
It is a useful method to multiply genetically uniform populations of elite species
D
Homozygous diploids can be obtained
Solution
(C) Tissue culture,specifically micropropagation,allows for the rapid multiplication of plants from a small amount of parental tissue.
Because the plants are produced through asexual reproduction (mitosis),the offspring are genetically identical to the parent plant.
This is of great economic importance because it allows for the mass production of genetically uniform populations of elite (high-yielding or disease-resistant) plant species in a short period.
Because the plants are produced through asexual reproduction (mitosis),the offspring are genetically identical to the parent plant.
This is of great economic importance because it allows for the mass production of genetically uniform populations of elite (high-yielding or disease-resistant) plant species in a short period.
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8
BiologyMediumMCQAIIMS · 1994
The percentage of heterozygous individuals obtained in $F_2$ generation from selfing the plants with genotype $Rr$ would be
A
$25$
B
$50$
C
$75$
D
$100$
Solution
(B) When a plant with genotype $Rr$ is selfed,the cross is $Rr \times Rr$.
According to the Punnett square,the offspring genotypes are $RR, Rr, Rr,$ and $rr$.
Out of these $4$ combinations,$2$ are heterozygous ($Rr$ and $Rr$).
Therefore,the percentage of heterozygous individuals is $(2/4) \times 100 = 50\%$.
According to the Punnett square,the offspring genotypes are $RR, Rr, Rr,$ and $rr$.
Out of these $4$ combinations,$2$ are heterozygous ($Rr$ and $Rr$).
Therefore,the percentage of heterozygous individuals is $(2/4) \times 100 = 50\%$.
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9
BiologyMediumMCQAIIMS · 1994
The stratospheric ozone depletion leads to:
A
Global warming
B
Increase in the incidence of skin cancers
C
Forest fires
D
All the above
Solution
(B) The stratospheric ozone layer acts as a shield that absorbs harmful ultraviolet $(UV)$ radiation from the sun.
Depletion of this layer allows more $UV-B$ radiation to reach the Earth's surface.
$UV-B$ radiation damages $DNA$ and induces mutations,which significantly increases the incidence of skin cancers and cataracts in humans.
While global warming is primarily caused by greenhouse gases and forest fires are often related to climate change or human activity,the direct and most scientifically established consequence of ozone depletion is the increased exposure to harmful $UV$ radiation leading to skin cancers.
Depletion of this layer allows more $UV-B$ radiation to reach the Earth's surface.
$UV-B$ radiation damages $DNA$ and induces mutations,which significantly increases the incidence of skin cancers and cataracts in humans.
While global warming is primarily caused by greenhouse gases and forest fires are often related to climate change or human activity,the direct and most scientifically established consequence of ozone depletion is the increased exposure to harmful $UV$ radiation leading to skin cancers.
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10
BiologyEasyMCQAIIMS · 1994
The 'truth drug' scopolamine, which was used extensively in World War $II$, is obtained from:
A
Eucalyptus
B
Digitalis purpurea
C
Datura stramonium
D
Papaver somniferum
Solution
(C) Scopolamine, also known as hyoscine, is a tropane alkaloid drug.
It is naturally produced in the plants of the family $Solanaceae$, most notably in $Datura$ $stramonium$ (Jimson weed).
During World War $II$, it was investigated for its potential as a 'truth drug' due to its ability to induce a state of sedation and reduce inhibitions, although its reliability for this purpose was highly questionable.
It is naturally produced in the plants of the family $Solanaceae$, most notably in $Datura$ $stramonium$ (Jimson weed).
During World War $II$, it was investigated for its potential as a 'truth drug' due to its ability to induce a state of sedation and reduce inhibitions, although its reliability for this purpose was highly questionable.
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