BiologyQ1–6 of 6 questions
Page 1 of 1 · English
1
BiologyEasyMCQAIIMS · 1989
The axis developing between the androecium and the gynoecium is known as:
A
Anthophore
B
Androphore
C
Gynophore
D
Gynandrophore
Solution
(C) The elongated internode that develops between the androecium and the gynoecium is called a $Gynophore$. This structure elevates the gynoecium above the androecium. Examples include plants like $Capparis$ and $Gynandropsis$.
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2
BiologyEasyMCQAIIMS · 1989
$Colchicum$ $autumnale$ is a member of which family?
A
Brassicaceae
B
Liliaceae
C
Poaceae
D
Fabaceae
Solution
(B) $Colchicum$ $autumnale$ belongs to the family $Liliaceae$.
The corm of this plant is the source of an alkaloid known as colchicine.
Colchicine is widely used in plant breeding and cytogenetics to induce polyploidy by inhibiting spindle formation during cell division.
The corm of this plant is the source of an alkaloid known as colchicine.
Colchicine is widely used in plant breeding and cytogenetics to induce polyploidy by inhibiting spindle formation during cell division.
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3
BiologyEasyMCQAIIMS · 1989
Histogen theory states that epidermis is derived from the
A
Periblem
B
Cambium
C
Cortex
D
Dermatogen
Solution
(D) The Histogen theory,proposed by $Hanstein$,suggests that the root and shoot apices consist of three distinct meristematic zones or histogens: $Dermatogen$,$Periblem$,and $Plerome$.
$Dermatogen$ is the outermost layer of the apical meristem.
It is responsible for the formation of the epidermis and the epidermal tissue system in plants.
Therefore,the correct option is $D$.
$Dermatogen$ is the outermost layer of the apical meristem.
It is responsible for the formation of the epidermis and the epidermal tissue system in plants.
Therefore,the correct option is $D$.
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4
BiologyEasyMCQAIIMS · 1989
The pigment phytochrome is involved in:
A
Phototropism
B
Photorespiration
C
Photoperiodism
D
Geotropism
Solution
(C) Phytochrome is a light-sensitive pigment found in plants that acts as a photoreceptor. It plays a crucial role in photoperiodism,which is the physiological response of plants to the relative lengths of light and dark periods. The stimulus of light is perceived by the phytochrome present in the leaves,which then triggers flowering and other developmental processes.
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5
BiologyMediumMCQAIIMS · 1989
Strands of $DNA$ are bonded by
A
Hydrogen
B
Carbon
C
Oxygen
D
Nitrogen
Solution
(A) The two strands of the $DNA$ double helix are held together by hydrogen bonds between the nitrogenous bases.
Specifically, there is a double hydrogen bond between adenine and thymine $(A = T)$ and a triple hydrogen bond between cytosine and guanine $(C \equiv G)$.
Specifically, there is a double hydrogen bond between adenine and thymine $(A = T)$ and a triple hydrogen bond between cytosine and guanine $(C \equiv G)$.
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6
BiologyMediumMCQAIIMS · 1989
The value of a resource is dependent on its:
A
Quality
B
Quantity
C
Requirement and type of society
D
All the above
Solution
(D) The value of a resource is not an inherent property but is determined by several factors.
$1$. Quality: The grade or purity of a resource determines its utility.
$2$. Quantity: The availability or abundance of a resource affects its economic value.
$3$. Requirement and type of society: Different societies have different needs based on their level of technological development and cultural practices. $A$ material becomes a resource only when it satisfies human needs and has utility for a specific society.
Therefore,all these factors collectively determine the value of a resource.
$1$. Quality: The grade or purity of a resource determines its utility.
$2$. Quantity: The availability or abundance of a resource affects its economic value.
$3$. Requirement and type of society: Different societies have different needs based on their level of technological development and cultural practices. $A$ material becomes a resource only when it satisfies human needs and has utility for a specific society.
Therefore,all these factors collectively determine the value of a resource.
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