BiologyQ51–56 of 104 questions
Page 2 of 2 · English
51
BiologyMediumMCQAIPMT · 2006
In mosses $(Funaria)$,the plant body is ......
A
Completely sporophytic
B
Completely gametophytic
C
Gametophytic with dominant sporophyte
D
Sporophytic with dominant gametophyte
Solution
(B) In bryophytes,including mosses like $Funaria$,the dominant phase of the life cycle is the gametophyte.
The plant body is haploid $(n)$ and represents the gametophytic generation.
The sporophyte $(2n)$ is dependent on the gametophyte for its nutrition and anchorage.
Therefore,the plant body is primarily gametophytic.
The plant body is haploid $(n)$ and represents the gametophytic generation.
The sporophyte $(2n)$ is dependent on the gametophyte for its nutrition and anchorage.
Therefore,the plant body is primarily gametophytic.
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52
BiologyMediumMCQAIPMT · 2006
Which of the following groups of four animals all give birth to young ones?
A
Platypus,Penguin,Bat,Hippopotamus
B
Sparrow,Bat,Cat,Kiwi
C
Kangaroo,Hedgehog,Dolphin,Loris
D
Lion,Bat,Whale,Ostrich
Solution
(C) Animals that give birth to young ones are known as viviparous mammals.
$A$. Platypus is an oviparous (egg-laying) mammal.
$B$. Sparrow and Kiwi are birds (oviparous).
$C$. Kangaroo (marsupial),Hedgehog (placental mammal),Dolphin (aquatic mammal),and Loris (primate) are all mammals that give birth to young ones.
$D$. Ostrich is a bird (oviparous).
$A$. Platypus is an oviparous (egg-laying) mammal.
$B$. Sparrow and Kiwi are birds (oviparous).
$C$. Kangaroo (marsupial),Hedgehog (placental mammal),Dolphin (aquatic mammal),and Loris (primate) are all mammals that give birth to young ones.
$D$. Ostrich is a bird (oviparous).
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53
BiologyMediumMCQAIPMT · 2006
In the seeds of cereals,the single cotyledon is represented by the . . . . . . .
A
Scutellum
B
Coleoptile
C
Coleorhiza
D
Radicle
Solution
(A) In monocotyledonous seeds such as cereals (e.g.,wheat,maize),the embryo consists of a single cotyledon. This large,shield-shaped cotyledon is known as the $Scutellum$. It is situated towards one side of the embryonal axis. Therefore,the correct option is $A$.
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54
BiologyMediumMCQAIPMT · 2006
Which type of placentation is observed in pea plants?
A
Axile
B
Free central
C
Marginal
D
Basal
Solution
(C) In pea plants,the ovary is monocarpellary and unilocular. The placenta forms a ridge along the ventral suture of the ovary,and the ovules are arranged in two rows along this ridge. This type of placentation is known as $Marginal$ placentation. Therefore,the correct option is $C$.
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55
BiologyEasyMCQAIPMT · 2006
Bowman's glands are located in the ....... .
A
Anterior pituitary gland
B
Female reproductive system of cockroach
C
Olfactory epithelium of our nose
D
Proximal end of uriniferous tubules
Solution
(C) Bowman's glands (also known as olfactory glands) are specialized glands located in the olfactory epithelium of the nasal cavity.
These glands secrete mucus,which helps in dissolving odorants so that they can be detected by the olfactory receptors.
Therefore,the correct location is the olfactory epithelium of our nose.
These glands secrete mucus,which helps in dissolving odorants so that they can be detected by the olfactory receptors.
Therefore,the correct location is the olfactory epithelium of our nose.
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56
BiologyMediumMCQAIPMT · 2006
What is an enzyme called when it is bound to an organic substance that is essential for its activity?
A
Holoenzyme
B
Apoenzyme
C
Isoenzyme
D
Coenzyme
Solution
(A) An enzyme that requires a non-protein organic component for its catalytic activity is known as a $Holoenzyme$.
$1$. The protein portion of the enzyme is called the $Apoenzyme$.
$2$. The non-protein organic substance that binds to the $Apoenzyme$ to make it active is called a $Coenzyme$.
$3$. When the $Apoenzyme$ and the $Coenzyme$ (or other cofactors) are combined,the complete,active enzyme complex is referred to as a $Holoenzyme$.
$1$. The protein portion of the enzyme is called the $Apoenzyme$.
$2$. The non-protein organic substance that binds to the $Apoenzyme$ to make it active is called a $Coenzyme$.
$3$. When the $Apoenzyme$ and the $Coenzyme$ (or other cofactors) are combined,the complete,active enzyme complex is referred to as a $Holoenzyme$.
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