Fertilization is

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(B) Fertilization is the fusion of a sperm and an ovum. $1$. The process of fusion of a sperm (male gamete) with an ovum (female gamete) is called fer

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Fusion of sperm and ova

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(B) Fertilization is the fusion of a sperm and an ovum. $1$. The process of fusion of a sperm (male gamete) with an ovum (female gamete) is called fertilization. $2$. During coitus,semen is released by the penis into the vagina (insemination). $3$. The motile sperms swim rapidly through the cervix,enter into the uterus,and reach the ampullary-isthmic junction of the oviduct,which is the site of fertilization. $4$. $A$ sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane to block the entry of additional sperms. $5$. The enzymes of the acrosome of the sperm help to dissolve the zona pellucida and plasma membrane of the ovum,allowing the sperm head to enter the cytoplasm of the ovum (secondary oocyte). $6$. Ultimately,a diploid zygote is produced by the fusion of the haploid sperm and ovum.

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