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Which of the following statements regarding fertilization is/are correct?
(i) The acrosome is filled with hydrolytic enzymes which help in dissolving the membrane of the ovum at the time of fertilization.
(ii) Vitelline membrane is the first membrane to be faced by sperms while trying to fuse with the ovum.
(iii) There must be synchronicity in the release of ovum and entry of sperm for the formation of zygote.
(iv) The meiotic division of the secondary oocyte is concluded with the entry of male gamete.
Options:
(i) The acrosome is filled with hydrolytic enzymes which help in dissolving the membrane of the ovum at the time of fertilization.
(ii) Vitelline membrane is the first membrane to be faced by sperms while trying to fuse with the ovum.
(iii) There must be synchronicity in the release of ovum and entry of sperm for the formation of zygote.
(iv) The meiotic division of the secondary oocyte is concluded with the entry of male gamete.
Solution:
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Verified Answer
The correct answer is:
i, iii and iv
During fertilization for the entry of sperm in the ovum, the acrosome breaks it with the help of digestive enzymes present in it. The acrosome contains hyaluronidase and acrosin enzymes which eat up the zona pellucida and allows the haploid nucleus in the sperm to join with the haploid nucleus of the ovum.
The outer membrane of the ovum is called Zona pellucida.
Egg can only survive for up to 24 hours after it's released while sperm can live in the female reproductive tract for about 3 to 5 days. Meeting of sperm with ovum in this duration can increase the chances of fertilization.
In oogenesis, oogonium(2n) undergoes mitosis and develops into a primary oocyte, which will begin the first meiotic division, but then arrest; it will finish this division as it develops in the follicle, giving rise to a haploid secondary oocyte and a smaller polar body.
The secondary oocyte begins the second meiotic division and then arrests again; and will remain so unless it is fertilized by a sperm; if this occurs, a mature ovum and another polar body is produced.
The outer membrane of the ovum is called Zona pellucida.
Egg can only survive for up to 24 hours after it's released while sperm can live in the female reproductive tract for about 3 to 5 days. Meeting of sperm with ovum in this duration can increase the chances of fertilization.
In oogenesis, oogonium(2n) undergoes mitosis and develops into a primary oocyte, which will begin the first meiotic division, but then arrest; it will finish this division as it develops in the follicle, giving rise to a haploid secondary oocyte and a smaller polar body.
The secondary oocyte begins the second meiotic division and then arrests again; and will remain so unless it is fertilized by a sperm; if this occurs, a mature ovum and another polar body is produced.
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