Question

Primary sex organs differ from the secondary sex organs in all the following, except.
a. They produce gametes
b. They secrete sex hormones
c. They are concerned with the conduction of gametes
d. Testes in male and ovaries in female are the examples of primary sex organs

Answer 1

Hint: Reproduction is the process in which new offsprings are produced by sexually or asexually. Humans reproduce sexually. Sexual reproduction involves two specialized gametes –a male gamete (sperm) and a female gamete (ovum). Testis and ovaries synthesize gametes for reproduction. The primary sex organs are the major sex organs and the secondary sex organs are the associative sex organs.

Complete answer:
> Sex organs are the organs involved in sexual reproduction, they are of two types- Primary sex organs and secondary sex organs. The primary sex organ in male and female is the testes and ovaries respectively. The secondary sex organs include the ducts and glands that facilitate the conduction of the gametes produced.

> The testes produce the male gamete that is known as sperm and the ovaries produce the female gametes that are the egg or secondary oocyte. Production of gametes is a characteristic just limited to the primary sex organs. The secondary sex organs don’t produce gametes.

> Once the gametes are produced in the primary sex organs, they need to be conducted. The sperms produced in testes move through the sperm transport ducts that are the secondary sex organs. In females, the egg when released from the ovary enters the fallopian tube where it is conducted towards the Ampulla- Isthmus junction of the fallopian tube where fertilization occurs.

> Sex hormones are the hormones that help in reproduction and development of sexual character. The sex hormones differ in males and females. Estrogen and Progesterone are the female sex hormones that are secreted by the female primary sex organ-ovaries. These female sex organs stimulate female sexual characters. Testosterone is the male sex hormone that is secreted by the male primary sex organ-testes. Testosterone stimulates the gametogenesis along with the male secondary sexual characters.

Hence, the correct answer is option (A).
This is because the production of gametes is not a function of the secondary sex organs. This is the point at which the primary sex organs differ from the secondary sex organs.

Note: The main function or primary sex organs is gametogenesis that is production of gametes and secretion of sex hormones. They are also associated with the conduction of gametes. Human beings are heterogamous, that is two different kinds of gametes are found in humans. The female gamete is non motile while the male gamete is motile.