Question

Find the odd one out.
a) Testes
b) Sperm duct
c) Penis
d) Ovary

Answer 1

Male and female have different reproductive structures. The female ovary is the source of ova (female germ cells). The two ovaries are located in the pelvic cavity in females.

Complete answer:
a) Testes: These are the primary male sex organs situated outside the abdominal cavity in a pouch called as scrotum. The formation of sperms by the process of spermatogenesis occurs in testis.
Option (a) is incorrect.
b) Sperm duct: Sperm duct or the sex accessory ducts are the male secondary sexual organs. These ducts store and transport the sperms from the testis to the outside through urethra.
Option (b) is incorrect.
c) Penis: It is the male external genitalia and the copulatory organ. It is made of special tissue that helps in the erection of penis to facilitate insemination.
Option (c) is incorrect.
d) Ovary: Ovaries are the primary female sex organ that produce the female gamete ovum by the process of oogenesis.
Out of these four, ovary is the only one that is present in females.

Hence the correct answer is option (d).

Note:
The testes are present in scrotum, because it maintains lower than the normal body temperature which is required for spermatogenesis. Apart from ducts males also have male accessory glands. Secretion of these glands constitutes seminal plasma and also helps in lubrication of penis.
Females have oviducts, uterus and vagina that constitute the female accessory ducts. In females, the external genitalia are vulva, the erectile tissue is clitoris and the copulatory organ is vagina.