The growing of facial hair in adolescent boys and the development of breasts in adolescent girls are examples of
a. primary sexual characteristics.
b. secondary sexual characteristics.
c. tertiary sexual characteristics.
d. delayed sexual characteristics.
e. pre-adult sexual characteristics.
The correct answer and explanation is:
The correct answer is b. secondary sexual characteristics.
Secondary sexual characteristics are features that emerge during puberty but are not directly involved in reproduction. They differentiate the sexes but do not include the primary organs involved in reproduction (such as the testes in males and ovaries in females). These characteristics are influenced by hormonal changes that occur during puberty.
In males, secondary sexual characteristics include the development of facial hair, deepening of the voice, broadening of the shoulders, and an increase in muscle mass. In females, the development of breasts, widening of the hips, and the onset of menstruation are common secondary sexual characteristics. These features are not directly related to the reproductive system but play a role in sexual differentiation, signaling that an individual is maturing biologically and sexually.
Primary sexual characteristics, in contrast, involve the reproductive organs and are present at birth. For males, this includes the penis and testes, while for females, it includes the vagina and ovaries. These organs are directly involved in the production of gametes (sperm and eggs) and reproduction itself.
The term “tertiary sexual characteristics” is not commonly used in biological discussions about puberty. “Delayed sexual characteristics” refers to instances where the typical signs of puberty, such as the growth of facial hair or breast development, occur later than expected. “Pre-adult sexual characteristics” would not be a standard term in the context of sexual development, as it is not typically used in biological or medical descriptions of puberty.