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Question
State whether the following statements are True or False. If false, correct the statement:
(a) External fertilisation can occur both in water and on land.
(b) The eggs of fish are covered by hard shells of protection.
(c) Human egg has a head, middle piece and tail.
(d) In adult human females, a single mature egg is released into an oviduct every month.
(a) External fertilisation can occur both in water and on land.
(b) The eggs of fish are covered by hard shells of protection.
(c) Human egg has a head, middle piece and tail.
(d) In adult human females, a single mature egg is released into an oviduct every month.
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Solution
(a) External fertilisation can occur both in water and on land – False
Correct statement: External fertilisation occurs only in water.
External fertilisation is the fusion of the gametes outside the parent body. Male and female gametes are released into the water and fertilise to form a zygote.
(b) The eggs of fish are covered by hard shells of protection. False
Correct statement: The eggs of reptiles are covered by hard shells for protection.
The lower aquatic vertebrate animals like fish and amphibians release gametes in the water where these fertilize to form the zygote.
Fsh release unfertilised gametes in a group covered in a gelatinous jelly.
(c) The human egg has a head, middle piece and tail – False
Correct statement: Human sperm has a head, middle piece and tail.
Sperm is a small elongated cell with a head containing nucleus, middle piece with mitochondria and a tail. An ovum is a large spherical cell released by the ovary into oviducts for fertilisation.
(d) In adult human females, single mature egg is released into an oviduct every month - True
The human ovary releases an egg every
month into the fallopian tubes which
either gets fertilised by a sperm or gets disintegrated and is washed out of the
uterus along with the endometrial lining prepared for the fertilisation.
Correct statement: External fertilisation occurs only in water.
External fertilisation is the fusion of the gametes outside the parent body. Male and female gametes are released into the water and fertilise to form a zygote.
(b) The eggs of fish are covered by hard shells of protection. False
Correct statement: The eggs of reptiles are covered by hard shells for protection.
The lower aquatic vertebrate animals like fish and amphibians release gametes in the water where these fertilize to form the zygote.
Fsh release unfertilised gametes in a group covered in a gelatinous jelly.
(c) The human egg has a head, middle piece and tail – False
Correct statement: Human sperm has a head, middle piece and tail.
Sperm is a small elongated cell with a head containing nucleus, middle piece with mitochondria and a tail. An ovum is a large spherical cell released by the ovary into oviducts for fertilisation.
(d) In adult human females, single mature egg is released into an oviduct every month - True
The human ovary releases an egg every
month into the fallopian tubes which
either gets fertilised by a sperm or gets disintegrated and is washed out of the
uterus along with the endometrial lining prepared for the fertilisation.
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