<prompt> 1st sign of puberty in males is -Increase testicular volumePeak growth velocityPenis enlargementIncreased pubic hair  <response>: Ans. is a i.e., Increase testicular volume o In boys, the first visible sign of puberty and the hallmark of SMR 2 is testicular enlargement,o The sequence of development of secondary sexual characteristic in hoys is - Testicular enlargement - Penis enlargement - Pubic hair growth - Peak growth velocity - Axillary hair - facial hair.o In girls, the first visible sign of puberty is the appearance of breast buds Thelarche, between 8-12 years of age.o In boys the first visible sign of puberty is testicular enlargement, beginning as early as 9 12 yr. 