Abstract:
Sex ratio is one of the most important population ratios for demographic studies and it can be
used to describe the degree of balance between two elements, male and female, of the
population. Sex ratio is the number of males available for 100 females and it considered as one
of the key social indicators. There are three types of Sex ratios: primary, secondary and tertiary.
The primary sex ratio means the ratio which is measured at the time of conception. The
secondary sex ratio refers to the ratio that is measured at the time of birth. Tertiary sex ratio
denotes the ratio of mature organisms.
