. Given below are events that lead to pregnancy and development of the embryo.
i)Fertilization of egg
ii)Maturation of egg
iii)Release of egg
iv)Embedding of the embryo in the thickened uterine wall.
Which of the following options gives the correct order of sequence in which they occur?
(a) i, ii, iii, iv,
(b) ii, i, iii, iv
(c) i, iv, ii, iii
(d) ii, iii, i, iv
Answer: (d) ii, iii, i, iv
The sequence of events is as follows:
1. Maturation of egg after puberty.
2. Release of the egg cell.
3. Fertilization of the egg by sperm to form the zygote.
4. Repeated division of zygote to form an embryo.
5. Embryo gets embedded in the wall of the uterus for further development.