REPRODUCTION
HUMAN REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cells of corona radiata trap all the sperms except one
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Only two sperms nearest the ovum penetrate zona pellucida
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Secretion of acrosome helps one sperm enter cytoplasm of ovum through Zona pellucida
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All sperms except the one nearest the ovum lose their tails.
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Detailed explanation-1: -What happens during fertilization in humans after many sperms reach close to the ovum? All sperms except the one nearest to the ovum lose their tails. No worries!
Detailed explanation-2: -During the process of fertilization, when sperm comes into contact with the zona pellucida layer of the ovum a cortical reaction occurs that causes a modification of the zona pellucida thereby preventing polyspermy.
Detailed explanation-3: -So, the correct option is ‘Secretions of acrosome help one sperm enter the cytoplasm of ovum through zona pellucida’.
Detailed explanation-4: -Fertilisation occurs when a sperm fuses with the female act during intercourse and further forms an egg that gets implanted in uterus of the female. The sperm travels through the fallopian tube and penetrates the zona pellucida layer of the ovum (female egg) and fuses with it which forms zygote (fertilized egg).
Detailed explanation-5: -When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.