1
Question
In a mammalian sperm, spirally arranged mitochondria around an axial filament occurs in
In a mammalian sperm, spirally arranged mitochondria around an axial filament occurs in
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Solution
The correct option is B Middle piece
Sperm
Sperm is a mature male gamete containing 23 chromosomes. It possesses head, neck, middle piece and tail.
Head
The head contains an acrosome on the anterior side, which contains enzymes that facilitate the entry of sperm into the ovum. It is followed by an elongated nucleus with haploid chromosome number.
Middle piece
The middle piece of spermatozoa possesses numerous mitochondria, spirally arranged around the axial filament. It produces energy required for the movement of the tail essential for fertilisation.
Principal piece of tail
The principal piece of the tail is the longest portion of the sperm tail. It possesses protein fibers and contractions of these gives a characteristic wavelike movement. It is covered by the plasma membrane and possesses the axial filament with 9+2 microtubule arrangement like that of flagella.
End piece of tail
The end piece of the sperm tail contains only the axoneme surrounded by the plasma membrane.
Pictorial representation of spermatozoa
Pictorial representation of spermatozoa:
Final answer
(A) Middle piece
Sperm
Sperm is a mature male gamete containing 23 chromosomes. It possesses head, neck, middle piece and tail.
Head
The head contains an acrosome on the anterior side, which contains enzymes that facilitate the entry of sperm into the ovum. It is followed by an elongated nucleus with haploid chromosome number.
Middle piece
The middle piece of spermatozoa possesses numerous mitochondria, spirally arranged around the axial filament. It produces energy required for the movement of the tail essential for fertilisation.
Principal piece of tail
The principal piece of the tail is the longest portion of the sperm tail. It possesses protein fibers and contractions of these gives a characteristic wavelike movement. It is covered by the plasma membrane and possesses the axial filament with 9+2 microtubule arrangement like that of flagella.
End piece of tail
The end piece of the sperm tail contains only the axoneme surrounded by the plasma membrane.
Pictorial representation of spermatozoa
Pictorial representation of spermatozoa:
Final answer
(A) Middle piece
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