Which of these is not a secondary sex characteristic?
(a) increase in height
(b) release of testosterone
(c) voice change
(d) hair growth on body

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Solution

(a) increase in height
Secondary sexual characters are those features that help to distinguish the male from the female. Hence, increase in height is not a secondary sexual character while release of testosterone, voice change and hair growth on body are secondary sexual characteristics.

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Q. Question 23
In human females, an event that reflects onset of reproductive phase is

(a) growth of body
(b) changes in hair pattern
(c) change in voice
(d) menstruation

Q. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below:

Figure 1:

Testosterone regulation by cooperation between the hypothalamus, pituitary, and testicular endocrine glands. The major regulatory hormones involved are luteinizing hormone (LH), follicle-stimulating hormone (FSH) and gonadotropin-releasing hormone (GnRH).

When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. FSH and LH then stimulate the testis to produce testosterone.
How is homeostasis achieved when testosterone levels begin to rise?

1. MALE- Cracking of voice, appearance of beard, secretion of testosterone, growth of hair in armpit. FEMALE- onset of monthly periods, enlargement of breasts, appearance of hair in armpits, widening in hip region.

2. MALE- growth of hair on scalp, excess secretion of digestive enzymes, increase in circulation in skin, enlargement of voice box. FEMALE- More secretion of keratin for hair growth, lightening of skin, more secretion of salivary amylase, darkening of pupil in eyes.

Which of the above are true in regards to sexual maturation?

Q. What is responsible for secondary male sexual characteristic like deep voice, facial hair, etc.?

Question 22
During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys

(a) loss of milk teeth
(b) increase in height
(c) cracking of voice
(d) weight gain

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Which of these is not a secondary sex characteristic? (a) increase in height (b) release of testosterone (c) voice change (d) hair growth on body

(a) increase in height Secondary sexual characters are those features that help to distinguish the male from the female. Hence, increase in height is not a secondary sexual character while release of testosterone, voice change and hair growth on body are secondary sexual characteristics.

Which of these is not a secondary sex characteristic?
(a) increase in height
(b) release of testosterone
(c) voice change
(d) hair growth on body

(a) increase in height
Secondary sexual characters are those features that help to distinguish the male from the female. Hence, increase in height is not a secondary sexual character while release of testosterone, voice change and hair growth on body are secondary sexual characteristics.