Question

Which one of the following is primary sex organ?
A.Penis
B.Scrotum
C.Testis
D.Prostrate

Answer 1

Hint: The reproductive system of male and female consists of many organs. Besides these there are some accessory sex characters. The primary sex organs are called gonads. These give rise to sex cells or gametes and secrete sex hormones. The growth and maintenance and functions of the gonads are regulated by specific hormones, the follicle stimulating hormone (FSH) and luteinising hormone (LH) from the anterior lobe of the pituitary gland.

Complete step by step answer:
-The gonads of the male are called testes. They produce male gametes, the spermatozoa.
-The gonads of females are termed as ovaries. They form in them the female gametes or ova.
-The testes are the primary sex organs. They are soft, smooth, pinkish, oval organs about 4-5 cm long , 2.5 cm wide and 3 cm thick. They are suspended in the scrotal sacs by spermatic cords.
-The testes consist of tunicae, testicular lobules

So the correct answer is option is C.Testis
Additional information:
-Secondary sex organs include the reproductive (genital) ducts that transport gametes and reproductive (genital) glands that help in reproductive process. They do not produce gametes or secrete hormones.
-Accessory sex characters : The sex characters dintinguishes the two sexes of a species externally. They play an indirect role in reproduction such as attraction for the mate, protection against intruders into the breeding terminator etc. Eg. Hair , larynx , voice etc.

Note:
Scrotum and penis are secondary sex organs whereas prostrate gland is accessory sex glands.Scrotum helps in maintaning the low temperature of testis as compared to internal body temperature.