Question

Define

$\left(i\right)$ Menarche.

Answer 1

• Menarche is the first occurrence of menstruation during puberty.
  
• Menarche is the beginning of the reproductive life of a girls at the age of about $10-12$ years of age.

The first occurrence of menstruation (or periods) at puberty is called menarche. Menarche is the beginning of the reproductive life of a girl (or woman).