The period between $12$ and $18$ years of age in a person is known as adolescence.

The eggs in which the fate of every part of the egg becomes fixed are called:

Given below are the events in human reproduction. Write them in correct sequential order: Insemination,gametogenesis,fertilisation,parturition,gestation,implantation.

Genetic recombination is due to .....

Which is the correct graphical representation of the pituitary hormone and ovarian hormone levels during the menstrual cycle?

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Placenta	$(i)$ Androgens
$(b)$ Zona pellucida	$(ii)$ Human Chorionic Gonadotropin $(hCG)$
$(c)$ Bulbo-urethral glands	$(iii)$ Layer of the ovum
$(d)$ Leydig cells	$(iv)$ Lubrication of the Penis