ChemistryQ1–8 of 8 questions
Page 1 of 1 · English
1
ChemistryMCQKCET · 2005
Which of the following groups of algae do not have eukaryotic organization?
A
Green algae
B
Blue-green algae
C
Red algae
D
Golden algae
Solution
(B) Blue-green algae,also known as cyanobacteria,possess a prokaryotic organization.
In a prokaryotic cell,there is no true nucleus,and membrane-bound cell organelles such as mitochondria,chloroplasts,$ER$ (Endoplasmic Reticulum),and Golgi bodies are absent.
Furthermore,the $DNA$ of prokaryotic cells lacks histone proteins,which are characteristic of eukaryotic cells.
In a prokaryotic cell,there is no true nucleus,and membrane-bound cell organelles such as mitochondria,chloroplasts,$ER$ (Endoplasmic Reticulum),and Golgi bodies are absent.
Furthermore,the $DNA$ of prokaryotic cells lacks histone proteins,which are characteristic of eukaryotic cells.
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2
ChemistryMCQKCET · 2005
Identify from the following plant parts,the major contributors to human food?
A
Stem
B
Root
C
Fruits
D
Leaves
Solution
(C) The major food crops of the world are wheat,rice,and maize. All these belong to the family $Poaceae$. The edible part of these crops is the $caryopsis$ fruit.
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3
ChemistryMCQKCET · 2005
Identify from the following,a plant tissue in which lignin does not occur in the cell walls?
A
Collenchyma
B
Sclerenchyma fibres
C
Sclereids
D
Xylem tracheae
Solution
(A) Collenchyma cells are elongated and polygonal with tapering ends,commonly found in the outer region of the cortex,such as the angles of stems and the midrib of leaves. The cell wall of collenchyma is composed of cellulose,pectin,and hemicellulose,and it lacks lignin. In contrast,Sclerenchyma fibres,Sclereids,and Xylem tracheae are all characterized by the presence of secondary cell walls thickened with lignin.
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4
ChemistryMCQKCET · 2005
Identify from the following,a hormone produced by the pituitary gland in both males and females but functional only in females.
A
Vasopressin
B
Relaxin
C
Prolactin
D
Somatotrophic hormone
Solution
(C) Prolactin,also known as luteotrophic hormone $(LTH)$ or lactogenic hormone,is produced by the anterior pituitary gland in both males and females. However,its primary function of initiating and maintaining milk secretion by the mammary glands is specific to females.
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5
ChemistryMCQKCET · 2005
Which of the following groups of cells in the male gonad represents haploid cells?
A
Spermatogonial cells
B
Germinal epithelial cells
C
Secondary spermatocytes
D
Primary spermatocytes
Solution
(C) In the process of spermatogenesis,spermatogonial cells $(2n)$,germinal epithelial cells $(2n)$,and primary spermatocytes $(2n)$ are diploid. Secondary spermatocytes are formed after the completion of meiosis-$I$,which is a reductional division. Therefore,secondary spermatocytes are haploid $(n)$.
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6
ChemistryMCQKCET · 2005
Which part of the human brain controls the breathing movements?
A
Cerebellum
B
Medulla oblongata
C
Cerebrum
D
Diencephalon
Solution
(B) The $Medulla$ $\text{oblongata}$ is a part of the hindbrain that acts as the primary respiratory rhythm center in humans.
It contains specialized chemosensitive areas that are highly sensitive to $CO_2$ and hydrogen ions.
When the concentration of these substances increases, the $Medulla$ $\text{oblongata}$ sends signals to the respiratory muscles to increase the rate of breathing to eliminate excess $CO_2$ from the body.
It contains specialized chemosensitive areas that are highly sensitive to $CO_2$ and hydrogen ions.
When the concentration of these substances increases, the $Medulla$ $\text{oblongata}$ sends signals to the respiratory muscles to increase the rate of breathing to eliminate excess $CO_2$ from the body.
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7
ChemistryMCQKCET · 2005
Maximum amount of oxygen is exchanged from the blood at the . . . . . . .
A
arteries of the body
B
capillaries surrounding tissue cells
C
capillaries surrounding the alveoli
D
left auricle of the heart
Solution
(B) The exchange of gases occurs primarily at the level of capillaries.
Oxygen is released from the blood into the tissue cells because the partial pressure of oxygen $(pO_2)$ is lower in the tissues compared to the blood.
Conversely,carbon dioxide is picked up from the tissues.
While oxygen is taken up by the blood in the capillaries surrounding the alveoli (pulmonary circulation),the maximum exchange of oxygen *from* the blood to the body cells occurs at the systemic capillaries surrounding the tissue cells.
Oxygen is released from the blood into the tissue cells because the partial pressure of oxygen $(pO_2)$ is lower in the tissues compared to the blood.
Conversely,carbon dioxide is picked up from the tissues.
While oxygen is taken up by the blood in the capillaries surrounding the alveoli (pulmonary circulation),the maximum exchange of oxygen *from* the blood to the body cells occurs at the systemic capillaries surrounding the tissue cells.
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8
ChemistryMCQKCET · 2005
Which of the following is a genetically dominant trait in human beings?
A
$O$ blood group
B
Colour blindness
C
Rh+ve blood group
D
Albinism
Solution
(C) The correct answer is $C$.
$Rh+ve$ blood group is a genetically dominant trait in humans,controlled by the $RHD$ gene.
$O$ blood group is a recessive trait (genotype $ii$).
Colour blindness is an $X$-linked recessive disorder.
Albinism is an autosomal recessive disorder.
$Rh+ve$ blood group is a genetically dominant trait in humans,controlled by the $RHD$ gene.
$O$ blood group is a recessive trait (genotype $ii$).
Colour blindness is an $X$-linked recessive disorder.
Albinism is an autosomal recessive disorder.
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