Assertion (A): At puberty, in boys, voice begins to crack and thick hair grows on face.
Reason (R): At puberty, there is decreased secretion of testosterone in boys.
The various changes which occur in boys at puberty are:
- Hair grows under armpits and in pubic regions (genital area) between the thighs.
- Hair also grows on other parts of the body like chest and face (moustache, beard, etc.)
- Body becomes more muscular due to the development of muscles.
- The voice deepens (or cracks).
- Chest and shoulders broaden.
- The penis and testes become larger.
- The testes start to make sperms.
- Feelings and sexual drives associated with adulthood begin to develop.
All these changes in boys are brought about by the male sex hormone 'testosterone’ made in testes.
- Assertion is true.
- Reasoning is false.
So, the correct answer is (c).