i) Fertilization is process involved in the sexual reproduction of organisms.

ii) It takes place when the male gamete sperm comes in contact with female gamete, the egg and fertilizes it.

iii) For this to take place, the sperms from a male enter the female vagina during sexual intercourse after which the sperms travel upwards till the fallopian tube where it fertilizes the egg.

iv) In females, one egg is released every month from either of the ovaries. This egg travels till the fallopian tube where it encounters the sperm.

v) The sperm now fuses with the egg and a single cell is formed, which is known as a zygote. This zygote has a complete set of DNA copies by receiving half from each of the male and female gametes.

vi) The formation of zygote completes the process of fertilization after which the zygote multiplies and grows into an embryo in the uterus.