Biology

Human Reproductive System

751 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 biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which one of the following is correct route for passage of sperms?

  1. Testes - Scrotum - Vasdeferens - Urethra - Penis

  2. Scrotum - Testes - Urethra - Vasdeferens - Penis

  3. Testes - Vasdeferens - Urethra - Seminal vesicles

  4. Testes - Vasdeferens - Urethra - Penis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sperms are produced in the testes in which the process of spermatogenesis takes place. The sperms move to the epididymis where they mature and are stored. The sperms pass through the vas deferens and then through the urethra. The sperms are ejaculated through the penis which is the copulatory organ. 

Thus, the correct answer is option D. 

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Temperature in scrotum necessary for sperm formation should be

  1. 2$^o$C above body temperature
  2. 2$^o$C below body temperature
  3. 4$^o$C above body temperature
  4. 4$^o$C below body temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The testes are situated outside the abdominal cavity within a pouch called scrotum. The temperature in scrotum necessary for sperm formation should be 2$^o$C below body temperature. The slightly cooler temperature of the scrotum is necessary for the development of normal sperm. The testes of human males are extra-abodominal because it descends into the scrotal sacs.

Thus, the correct answer is '2$^o$C below body temperature'.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The functional unit of testis of man is

  1. Uriniferous tubules

  2. Malpighian tubules

  3. Seminiferous tubules

  4. Acini or lobules
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Seminiferous tubule is the functional unit of testis of man. Each testis has about 250 compartments called testicular lobules, these compartments contain highly coiled tubules called seminiferous tubules. In seminiferous tubules, sperms are produced. Each seminiferous tubule is lined on its inside by two types of cells called male germ cell (spermatogonia) and Sertoli cells. These cells are also called nurse cells as they provide nutrition to the developing sperms. Head of developing sperms are embedded in the sertoli cells. The male germ cells undergo meiotic divisions finally leading to sperm formation.

Thus, the correct answer is 'Seminiferous tubules'.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

In mammals, the testes occur in scrotal sacs outside the viscera because of the

  1. Presence of urinary bladder

  2. Presence of rectum

  3. Long vas deferens

  4. Requirement of low temperature for spermatogenesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In mammals, the testes occur in scrotal sacs outside the viscera because of the requirement of low temperature for spermatogenesis. The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes (2–2.5$^o$ C lower than the normal internal body temperature), which is necessary for spermatogenesis. The slightly cooler temperature of the scrotum is necessary for the development of normal sperm. So, the testes start their development in the abdominal cavity and descend into the scrotal sacs during the 7$^{th}$ month of the fetal life, in presence of testosterone hormone.

Thus, the correct answer is 'Requirement of low temperature for spermatogenesis'.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Sertoli cells occur in

  1. Human testis

  2. Frog testis

  3. Human ovary

  4. Frog ovary
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sertoli cells occur in human testes. Each lobule of testes contains one to three seminiferous tubules in which the sperms are produced. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and sertoli cells. Sertoli cells are also known as nurse cells. They provide nutrition to spermatozoa. Spermatozoa are developing sperms. Heads of spermatozoa are embedded in the sertoli cells.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Testis of Whale are.

  1. Extra-abdominal

  2. Half external, half internal

  3. Internal

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The testis is the male reproductive gland in humans and animals. They descend into a scrotal sac which is present beneath the penis. But in whales, elephants, dolphins, rhinoceros testis present internally.

So the correct answer is 'Internal.'

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which of the following is the correct combination?

  1. Haemoglobin - Muscle contraction

  2. Sertoli cells - Sperm nutrition

  3. Rods and cones - Auditory reception

  4. Cochlea - Eye
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

sertoli cells or nurse cells which helps nourishing sperms and spermatogenesis.

So the correct answer is 'Sertoli cells - Sperm nutrition.'

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Sertoli cells are involved in

  1. Excretion

  2. Respiration

  3. Nutrition and morphogenesis of sperms

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sertoli cells or nurse cells which are a part of seminiferous tubules helps in process of spermatogenesis or production of sperms, nutrition, and morphogenesis of sperms.

So the correct option is 'Nutrition and morphogenesis of sperms.'

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is :

  1. Spermatogonia-spermatid-spermatocyte- sperms

  2. Spermatocyte-spermatogonia-spermatid- sperms

  3. Spermatogonia-spermatocyte-spermatid- sperms

  4. Spermatid-spermatocyte-spermatogonia- sperms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spermatogenesis begins with spermatogonia (diploid stem cells), which divide to form primary spermatocytes. These undergo meiosis to become spermatids, which then differentiate into mature spermatozoa (sperms).

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which among the following is not the function of testes at puberty?
(i) Formation of germ cells
(ii) Secretion of testosterone
(iii) Development of placenta
(iv) Secretion of estrogen

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gonads have a dual function, production of hormones and gametes. In the male, testes produce sperms and testosterone. 

Placenta develops in females during pregnancy. It has a number of functions, like the production of hormones, nutrition, excretion etc. Estrogen is a female hormone produced by the ovaries (female gonads). Thus, the correct answer is option C.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Which of the following organ is involved in production of sperm?

  1. Ovary

  2. Testis

  3. Vagina

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The testes are a pair of primary male reproductive organ. The testes are responsible for the production of sperm cells and the male sex hormone, testosterone.
Thus, the correct answer is option A.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

State the following statement is true or false.

Spermatozoa get nutrition from Sertoli cells.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sertoli cells are supportive, nutritive cells that secrete a polypeptide hormone which is known as inhibin.

These are found in the testis of males which help in providing nutrition to the growing spermatozoa, therefore, they are also known as nurse cells.
The spermatozoa, once they are divided from the sperm mother cell, remain embedded in the Sertoli cells by their heads to get nutrition.
So, the correct option is 'True'.

Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The testes of a great majority of mammals are typically enclosed in an extra abdominal sac, the scrotum. The temperature inside the scrotum is lower than that in the abdomen. What will happen if the temperature of the scrotum is artificially maintained to the level of abdominal temperature?

  1. The germinal epithelium will produce a large quantity of androgen secretion.

  2. The germinal epithelium of the testes will divide faster, thus producing more sperms.

  3. The germinal epithelium of the testes will degenerate, resulting in sterility.

  4. The germinal epithelium will carry out normal spermatogenesis.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The temperature of the scrotum is maintained at 2 degree celsius less than the normal body temperature.
  • Spermatogenesis requires this lower temperature.
  • This temperature of the scrotum is important for the production of viable sperm. 
  • If the temperature increases it will lead to the decrease in viable sperms causing sterility.
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Consider the following four statements (A-D) and select the option which includes all the correct ones 

A)  The male sex accessory ducts. Include rete testis, vasa efferentia, epididymis and vas deferens.

B)   Leydig cells synthesize and secrete testicular hormones called androgen.

C)   The male reproductive system is located in the pelvic region.

D)   Each testis has about 250 compartments called testicular lobules.

  1. $A, B, C, D$
  2. $B,C,D$
  3. $A,B,C $
  4. $A$ and $B$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The male reproductive is located in the pelvic region. It includes a pair of testes along with a pair of accessory ducts, glands and external genitalia. Each testis has  250 compartment called testicular lobules. Each lobule contains one to three highly coiled seminiferous tubules in which sperms are produced. The regions outside the seminiferous tubules called interstitial spaces contain small blood vessels called and Leydig cells. Leydig cells secrete a testicular hormone called androgens. The male sex accessory ducts include rete testis, vasa efferentia, epididymis and vas deferens.

So, the correct answer is ' All the statements are correct '