251.
What happens during fertilisation in humans after many sperms reach close to the ovum?
A
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
B
All sperms except the one nearest to the ovum lose their tails
C
Cells of corona radiata trap all the sperms except one
D
Only two sperms nearest the ovum penetrate zona pellucida
Answer :
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
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252.
Sperm differ from egg in having
A
Power of motility
B
No stored food
C
More number
D
All of the above
Answer :
All of the above
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253.
At the end of first meiotic division, male sperm differentiates into
A
secondary spermatocyte
B
primary spermatocyte
C
spermatogonium
D
spermatid
Answer :
secondary spermatocyte
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254.
Which structure show first meiosis division
A
Oogonia & spermatogonia
B
Secondary spermatocytes & Sec. Oocytes
C
Primary spermatocyte & primary oocytes
D
None of the above
Answer :
Primary spermatocyte & primary oocytes
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255.
Gastrulation is a process
A
Which begins the segregation of germ layers
B
The occurs just after modulation
C
That occur just after cleavage
D
Of rapid growth in blastomeres
Answer :
Which begins the segregation of germ layers
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256.
Cryptorchidism is a condition in which
A
Testis does not descend into scrotal sac
B
Sperm in not found
C
Male hormones are not reactive
D
Ovaries are removed
Answer :
Testis does not descend into scrotal sac
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257.
Sperms and ova are
A
Ectodermal in origin
B
Mesodermal in origin
C
Endodermal in origin
D
All of the above
Answer :
Mesodermal in origin
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258.
Which is not a secondary sex organ
A
Vagina
B
Penis
C
Prostate
D
Mammary gland
Answer :
Mammary gland
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259.
Cleavage in mammalian egg is
A
superficial meroblastic
B
discoidal meroblastic
C
unequal holoblastic
D
equal holoblastic
Answer :
unequal holoblastic
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260.
The head of mature mammalian sperm is made of
A
An acrosome
B
Elongated nucleus covered by acrosome
C
Two centrioles and an axial filament
D
Nucleus, acrosome, cytoplasm and mitochondrial sheath
Answer :
Elongated nucleus covered by acrosome
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