Question

Fertilization takes place in
A) Fallopian tube
B) Follicle
C) Uterus
D) Vagina

Answer 1

Hint: The ovum is released and produced from the ovary and is carried by a long slender canal where it gets mated with sperm and they fuse, giving birth to a diploid unicellular zygote. This process is termed as fertilisation.

Complete answer:
The method of fusion of a male gamete (or sperms) with a female gamete (ovum) is termed as fertilization. The two haploid nuclei that are resulted from either parent fuses to give rise to a diploid zygote which is universal in all sexually reproducing organisms. Fertilisation takes place and is accomplished in the isthmus portion of the fallopian tube. After fertilisation, many steps of rapid mitotic divisions called cleavage take place. In humans, cleavage starts and begins in the fallopian tube and morula is achieved after the 4th day of fertilisation.

Now let us find solution from given options:
A) Fallopian tube : these are tube shape structures. They consist of ampulla, isthmus and fimbriae. The fertilisation takes place in the ampullary-isthmic junction of the fallopian tube.
B) Follicle : follicles are the nourishing and the developing structure.
C) Uterus : Uterus is a pear shape structure that functions as the pathway for sperm deposited in the vagina to reach the uterine tubes or fallopian tubes. It acts as an implantation structure.
D) Vagina : Vagina is observed as a tubular and a 10 cm long canal lined with a mucous membrane extending from the exterior of the body to the uterine cervix.

Hence the correct answer is option ‘A’.

Note: The placenta serves as a barrier that is developed between the foetus and the mother. Although the blood of foetus and mother do not mix or blend, the placenta plays a role as an ultrafilter where soluble nutrients, minerals, hormones, antibodies, can cross over and pass onto the foetus.