Q82 of 290 Page 171

During adolescence, several changes occur in the human body. Mark one change from the following associate with sexual maturation in boys:

The human body undergoes several changes during adolescence. These changes mark the onset of puberty. The change which is associated with sexual maturation in boys is cracking of voice.

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80

In human males, the testes lie in the scrotam outside the body because it helps in the:

 81

Which among the following are not the functions of testes at puberty?

(i) formation of germ cells


(ii) secretion of testosterone


(iii) development of placenta


(iv) secretion of estrogen

 83

In human females, an event that indicates the onset of reproductive phase is :

 84

The off springs formed as a result of sexual reproduction exhibit more variations because :