181.
When both ovary are removed from rat then which hormone is decreased in blood
A
Oxytocin
B
Prolactin
C
Estrogen
D
Gonadotrophic releasing factor
Answer :
Estrogen
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182.
External fertilization mostly occurs in those animal which
A
Lay eggs in soil
B
Lay egg in water
C
Are viviparous
D
Are oviparous
Answer :
Lay egg in water
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183.
The amnion of mammalian embryo is derived from
A
ectoderm and mesoderm
B
endoderm and mesoderm
C
ectoderm and endoderm
D
mesoderm and trophoblast
Answer :
ectoderm and mesoderm
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184.
The process of fertilization is sea urchin was orignally noticed by
A
O-Hertwing
B
Flemming
C
Waldyer
D
Wilson
Answer :
O-Hertwing
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185.
Placenta in human beings is formed by
A
Amnion
B
Chrion
C
Allantois
D
Allantois, chrion and uterine wall
Answer :
Allantois, chrion and uterine wall
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186.
"Father of embryology" is
A
Spermann
B
Von Baer
C
Aristole
D
Bonnet
Answer :
Aristole
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187.
In the following which vitamin essential for gametogenesis
A
Vitamin A and E
B
C and D
C
E and K
D
E & B complex
Answer :
Vitamin A and E
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188.
Menstrual flow occurs due to lack of :
A
FSH
B
Oxytocin
C
Vasopressin
D
Progesterone
Answer :
Progesterone
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189.
Adaptation for approach of sperm of egg in mammals
A
Sperm kept inactive till ejaculation
B
Very high number of sperm
C
Peristalsis of oviduct
D
All of the above
Answer :
All of the above
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190.
Which one of the following statements about human sperm is correct?
A
Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
B
The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
C
Acrosome serves as a sensory structure leading the sperm towards the ovum
D
Acrosome serves no particular function
Answer :
The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
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