Class 8 Biology Reaching the Age of Adolescence Secondary sexual characters

Secondary sexual characters

Secondary sexual characters refer to the external features that distinguish a male from a female. The onset of puberty brings about a lot of changes in the body of the children. They undergo development of secondary sexual characters in them.

The secondary sexual characters in girls are as follows:

  • Their breasts start developing due to the secretion of female hormone i.e. estrogen.
  • Milk secreting glands called mammary glands also develops the breast.
  • They develop pubic hair, hair on their underarms.

 

The secondary sexual characters in boys are as follows:

  • They grow moustaches and beards.
  • They too develop pubic hair, hair on their underarms, and on their chest.
  • The testes in male release male hormone i.e. testosterone.
  • Occasional enlargement of penis.

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