Biology

Human Reproductive System

786 Questions

The human reproductive system covers the anatomy of reproductive organs, gamete production, fertilization processes, and reproductive technologies. This is a highly scoring area in biology sections of competitive exams. Use these questions to practice key concepts.

Fertilization processGamete productionReproductive organ functionsAssisted reproductive technology

Human Reproductive System Questions

Multiple choice

Leydig cells constitute the ____________.

  1. exocrine portion of the testes

  2. endocrine portion of the testes

  3. spermatogenic portion of the testes

  4. nutritive components of the testes

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Leydig cells constitute the endocrine portion of the testes.

Multiple choice

Cryptorchidism is a condition in which _____________.

  1. the spermatic cord twists

  2. the testes stop secretion of androgens

  3. the testes are abdominal

  4. the testes produce sperm but no hormones

  5. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cryptorchidism is a condition in which the testis are abdominal.

Multiple choice

Which of the following events will produce identical twins?

  1. Fertilization of two ova at the same time

  2. Fertilization of two ova by same sperm

  3. Division of fertilized egg into two

  4. Division of sperm into two before fertilization

  5. Fertilization of two ova by two sperms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Identical twins are born when a fertilized egg divides into two so that they have similar genetic material. 

Multiple choice

Which of the following events can lead to the birth of twins? a) Maturation of two ova and their simultaneous fertilization b) Division of fertilized egg c) Fertilization by two sperms d) Division of fertilizing sperm

  1. a or b

  2. a or c

  3. b or c

  4. b or d

  5. a only

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When there is maturation of two ova at the same time, and they get fertilized simultaneously, it leads tothe birth of twins. Division of fertilized egg may lead to the birth of twins. 

Multiple choice

Which of the following is the fate of ovum, if it is not fertilized?

  1. It is stored in ovary.

  2. It is implanted into uterus.

  3. It is destroyed in fallopian tubes.

  4. It undergoes self death.

  5. It is discarded through vagina

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

If ovum is not fertilized, it is discarded through vagina together with the lining of uterus and blood. 

Multiple choice

The karyotypes found in normal human sperm is

  1. 23, Y

  2. 23, X

  3. 46, XX

  4. 46, XY
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human sperm and egg are in the haploid states, i.e. they only have one copy of each chromosome, or 22 autosomes and one sex chromosome (either X or Y). Therefore, the most likely karyotype, of those listed, to be found in normal human sperm is 23, X. 23, Y is an equally likely karyotype in normal sperm.