Primary and Secondary Sex Organs MCQ - Practice Questions with Answers

• Humans reproduce sexually and are viviparous.
• The reproductive events in humans include:
  • formation of gametes (gametogenesis), i.e., sperms in males (spermatogenesis) and ovum in females (oogenesis) 
  • transfer of sperm into the female genital tract (insemination) 
  • the fusion of male and female gametes (fertilisation) leading to the formation of zygote 
  • formation and development of the blastocyst through the process called cleavage of the zygote
  • Attachment of the blastocyst to the uterine wall (implantation)
  • embryonic development (gestation) which includes gastrulation and organogenesis
  • delivery of the baby (parturition)
• These reproductive events occur after puberty.
• There are remarkable differences between the reproductive events in the male and in the female.
• Sperm formation continues even in old men, but the formation of ovum ceases in women
• around the age of fifty years. 

Primary Sex Organs in Man:

• Primary sex organs are those that are directly involved in the formation of the gametes and sex hormones.
• Testes are male gonads that are responsible for the formation of sperms and also the secretion of male sex hormone called testosterone.
• Hence, testes are the primary sex organs in human males.
• Ovaries are the female gametes that are responsible for the formation of ova and also the secretion of female sex hormone called oestrogen.
• Hence, ovaries are the primary sex organs in human females.

Secondary Sex Organs in Man:

• The organs which neither produce gametes nor secrete sex hormones are secondary sex organs.
• In human males, prostate gland, seminal vesicles, vasa deferentia and penis are the secondary sex organs.
• In human females, fallopian tubes, uterus, vagina and mammary glands are the secondary sex organs.