BiologyQ1–8 of 8 questions
Page 1 of 1 · English
1
BiologyEasyMCQAIIMS · 1986
The term "phylum" in animal classification was coined by
A
$E$. Haeckel
B
John Ray
C
$G$.$L$. Cuvier
D
Carolus Linnaeus
Solution
(A) The term "phylum" was introduced by the German biologist Ernst Haeckel in $1866$.
It was used to describe the primary divisions of the animal kingdom based on body plan and evolutionary relationships.
It was used to describe the primary divisions of the animal kingdom based on body plan and evolutionary relationships.
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2
BiologyMediumMCQAIIMS · 1986
The floral formula of mustard (or Brassicaceae/Cruciferae) is:
A
$ \oplus \, K_{2+2} \, C_{4} \, A_{2+4} \, \underline{G}_{(2)} $
B
$ \oplus \, K_{2+2} \, C_{4} \, A_{2+4} \, \overline{G}_{(2)} $
C
$ \% \, K_{2+2} \, C_{4} \, A_{2+4} \, \underline{G}_{(2)} $
D
$ \oplus \, K_{4} \, C_{4} \, A_{2+4} \, \underline{G}_{(2)} $
Solution
The floral formula of mustard (Brassicaceae) is $ \oplus \, K_{2+2} \, C_{4} \, A_{2+4} \, \underline{G}_{(2)} $.
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3
BiologyMediumMCQAIIMS · 1986
In which part of mitochondria is $ATP$ generated?
A
Matrix
B
Cristae
C
Outer membrane
D
$F_1$ particles (oxysomes)
Solution
(D) The generation of $ATP$ in mitochondria occurs through the process of oxidative phosphorylation. This process takes place in the inner mitochondrial membrane,specifically at the $F_1$ particles,also known as oxysomes or $ATP$ synthase complexes. These particles project into the mitochondrial matrix and are responsible for the synthesis of $ATP$ from $ADP$ and inorganic phosphate using the proton gradient established across the inner membrane.
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4
BiologyEasyMCQAIIMS · 1986
Movements of leaves of sensitive plant, $Mimosa \text{ } pudica$, are due to
A
Thermonasty
B
Seismonasty
C
Hydrotropism
D
Chemonasty
Solution
(B) The movement of leaves in the sensitive plant, $Mimosa \text{ } pudica$ (touch-me-not, family $Mimosaceae$), is known as seismonasty.
Seismonasty is a type of nastic movement in plants that occurs in response to mechanical stimuli such as touch, vibration, or shock.
When the leaves are touched, the turgor pressure in the pulvinus (the swollen base of the leaf) decreases, causing the leaves to fold inward.
Seismonasty is a type of nastic movement in plants that occurs in response to mechanical stimuli such as touch, vibration, or shock.
When the leaves are touched, the turgor pressure in the pulvinus (the swollen base of the leaf) decreases, causing the leaves to fold inward.
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5
BiologyEasyMCQAIIMS · 1986
Exogenous application of gibberellins induces male flower formation on genetically female plants in
A
Carica
B
Cucumis
C
Coccinia
D
Cucurbita
Solution
(B) Gibberellins are plant growth regulators that influence sex expression in certain plants.
In species like $Cucumis$ (e.g.,cucumber),the application of gibberellins promotes the development of male flowers on genetically female plants.
This is a well-documented physiological effect where hormonal treatment alters the phenotypic expression of sex in dioecious or monoecious plants.
In species like $Cucumis$ (e.g.,cucumber),the application of gibberellins promotes the development of male flowers on genetically female plants.
This is a well-documented physiological effect where hormonal treatment alters the phenotypic expression of sex in dioecious or monoecious plants.
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6
BiologyMediumMCQAIIMS · 1986
Which one of the following ratios is constant in $DNAs$ of different species?
A
$A + T / C + G$
B
$A + G / T + C$
C
$A + C / U + G$
D
$A + U / C + G$
Solution
(B) According to Chargaff's rules,in a double-stranded $DNA$ molecule,the amount of Adenine $(A)$ equals the amount of Thymine $(T)$,and the amount of Guanine $(G)$ equals the amount of Cytosine $(C)$.
Therefore,$A = T$ and $G = C$.
This implies that the ratio $(A + G) / (T + C)$ is equal to $1$,because $(A + G) = (T + C)$.
This ratio is constant for all species,although the base composition $(A + T) / (G + C)$ varies significantly between different species.
Therefore,$A = T$ and $G = C$.
This implies that the ratio $(A + G) / (T + C)$ is equal to $1$,because $(A + G) = (T + C)$.
This ratio is constant for all species,although the base composition $(A + T) / (G + C)$ varies significantly between different species.
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7
BiologyEasyMCQAIIMS · 1986
Hybridomas are employed for
A
Synthesis of antibiotics
B
Killing cancer cells
C
Synthesis of monoclonal antibodies
D
Production of somatic hybrids
Solution
(C) Hybridoma technology is a method used for the production of monoclonal antibodies.
In this process,a specific antibody-producing $B$-lymphocyte is fused with a myeloma (cancer) cell to form a hybridoma cell.
These hybridoma cells are immortal and can be cultured to produce large quantities of specific,uniform antibodies known as monoclonal antibodies,which are highly specific to a single antigen.
In this process,a specific antibody-producing $B$-lymphocyte is fused with a myeloma (cancer) cell to form a hybridoma cell.
These hybridoma cells are immortal and can be cultured to produce large quantities of specific,uniform antibodies known as monoclonal antibodies,which are highly specific to a single antigen.
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8
BiologyMediumMCQAIIMS · 1986
Biotic potential refers to
A
Increase of population under optimum conditions
B
Increase of population under given conditions
C
Increase of population under natural conditions
D
Increase of population under climatic conditions
Solution
(A) Biotic potential is defined as the maximum reproductive capacity of an organism or population under ideal or optimum environmental conditions,where resources are unlimited and environmental resistance is minimal.
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