Q. 92 B4.5( 23 Votes )
What is meant by ‘secondary sexual characteristics’ in humans? Explain with the help of two examples.
Sexual characteristics which develop in mature boys and girls are called secondary sexual characters. These changes are controlled by hormones.
Hormones released by the reproductive organs like testes and ovaries and involved in the development of secondary sexual characteristics are called sex hormones. The two common sex hormones are testosterone and estrogen.
Secondary sexual characteristics in males are:
(i) Hair grow on the face in the form of moustache and beard, and on the chest.
(ii) Testis grow and starts producing sperms in males.
Secondary sexual characteristics in females are:
(i) Milk secreting glands or mammary glands develop inside the breasts.
(ii) Initiation of menstruation.
(iii) Ovary enlarges and starts producing matured eggs.
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Salma had a very soft and smooth skin during her childhood.
As she entered adolescence, she developed pimples on her face.
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During adolescence, the body of boys and girls undergoes certain changes. Given below are a few of those changes.
(a) Broad shoulders
(b) Wider chests
(c) The wider region below the waist
(d) Development of muscles
(e) Development of mammary glands
(f) The growth of facial hair
(g) Acne and pimples on the face
(h) Development of sex organs
(i) High-pitched voice
(j) The growth of pubic hair.
Categorize these changes into those that occur in boys and those that occur in girls and fill in the table given below.
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