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

Spermatozoa are nourished during their development by

  1. Sertoli cell

  2. Interstitial cell

  3. Connective tissue cell

  4. Mast cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • 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. It is formed during the last stage of spermatogenesis. This stage is known as spermiogenesis.
  •  In this step, spermatids are transformed into spermatozoa (sperms) by the process of metamorphosis. Heads of spermatozoa are embedded in the Sertoli cells.

So, the correct answer is 'Sertoli cell'.

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

Human male germ cell is

  1. Zygote

  2. Ovum

  3. Testis

  4. Sperm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Human male germ cell is sperm. Each sperm is a single cell. During the last step of spermatogenesis, spermatids are transformed into spermatozoa by the process of metamorphosis. These spermatozoa are known as sperms. Mature sperm consists of a head, a neck, a middle piece and a tail. A plasma membrane envelops the whole body of sperm. The sperm head contains a very little cytoplasm, an elongated haploid nucleus, the anterior portion of which is covered by a cap-like structure, acrosome. Sperm fertilizes with ovum and leads to the formation of zygote.

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

What is the function of testes?

  1. Produces male gametes called sperms

  2. Produces female gametes called ova

  3. Both a and b

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

The primary function of the testes is the production of male gametes, known as sperm, and the secretion of male sex hormones like testosterone. Ova are female gametes produced by the ovaries.

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.