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

In the case of a premature delivery ($8^{th}$-month) of a male baby the testes are situated in

  1. Scrotal Sac

  2. Abdominal cavity

  3. Descending pathway

  4. Come into scrotal sac but not attached properly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • In the case of premature delivery, $8^{th}$-month) of a male baby the testis are situated in because of testes descent into the scrotum outside the body just before birth.
  • The testis is placed outside the body in scrotum because The scrotum helps in maintaining the low temperature of the testes (2–2.5°C lower than the normal internal body temperature) necessary for spermatogenesis. 
  • So, the correct answer is "Abdominal birth'.
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 incorrectly paired with its function ?

  1. Seminiferous tubules - add fluid containing mucus, fructose, and prostaglandins to semen

  2. Scrotum - encases testes and suspends them below abdominal cavity

  3. Epididymis - stores sperm

  4. Prostate gland - adds alkaline secretion to semen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Seminiferous tubules are present within the male testes. At seminiferous tubules, germination, maturation, and transportation of the sperm cells takes place. 
  • They are made up of columnar Sertoli cells. The scrotum is a sac of skin that encases the testes and suspends them below the abdominal cavity. It provides a slightly cooler temperature than the body temperature.
  •  Epididymis connects testicles to vas deference. It transports and stores sperm cells produced by testes. 
  • The prostate gland is present between the bladder and the penis. It secretes alkaline secretion to semen which protects and nourishes the sperm.

Thus, the correct answer is 'Seminiferous tubules - add fluid containing mucus, fructose, and prostaglandins to semen.'

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

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for?

  1. Escaping any possible compression by the visceral organs

  2. Providing more space for the growth of epididymis

  3. Providing a secondary sexual feature for exhibiting the male sex

  4. Maintaining the scrotal temperature lower than the internal body temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The sperms develop at a lower temperature than the internal body temperature which is 37 degree Celsius.
  • To maintain a lower temperature during spermatogenesis the testis descends in the scrotal sac outside of the abdominal cavity.
  • So, the correct option is 'Maintaining the scrotal temperature lower than the internal body temperature'.
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

Find the incorrect statement w.r.t. male reproductive system.

  1. Each seminiferous tubule is lined on its inside by two types of cells called Male germ cells and Sertoli cells

  2. The urethra originated directly from the seminal vesicle and extends through the penis to its external opening called urethra meatus

  3. Leydig cells synthesize and secrete testicular hormones are called androgens

  4. Secretion of seminal vesicle is rich in fructose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The male testes are divided into compartments by the septa. Each testicular lobule contains s 1-3 highly coiled seminiferous tubules, blood vessels, and connective tissues. Each seminiferous tubules is line by germinal epithelium, the seminiferous tubule is the site of spermatogenesis. Sertoli or nurse cells are present that help in the nursing of the spermatozoa and their maturation. The sperms are then known as the male gametes.


So, the correct option is 'Each seminiferous tubule is lined on its inside by two types of cells called Male germ cells and Sertoli cells'

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

What are the functions performed by the testis in human beings?

  1. Production of sperms

  2. Production of testosterone hormone

  3. Production of ovum

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The testes are a pair of ovoid glandular organs that are central to the function of the male reproductive system. The testes are responsible for the production of sperm cells and the male sex hormone, testosterone. The main male sex organs are the penis and the testicles, which produce semen and sperm.
Therefore, 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

Testes of man occur 

  1. Inside body

  2. Upper side of body

  3. On either side of dorsal aorta

  4. In scrotal sacs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Testes are the glandular glands that secrete hormone as well as produces male gametes. 
  • It is located in the scrotal sac, outside the body, because the process of spermatogenesis (sperm or male gamete production) requires a lower temperature i.e., 2-3${^0}$C lower than the normal body temperature. 
Multiple choice biology the reproductive system menstruation male reproductive system in humans male reproductive system reproduction in plants and animals

The ................ is primary reproductive organ in male.

  1. Testis

  2. Ovary

  3. Breast

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

The testes are a pair of ovoid glandular organs that are primary to the function of the male reproductive system. Its function is to produce sperm cells and the male sex hormone, testosterone.
So, 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

If the migration of testes does not take place in man, from abdominal cavity to scrotal sac, then

  1. Man will die.

  2. The development of male secondary sex character will not take place.

  3. The development of male reproductive system will not take place.

  4. The formation of sperms will not take place.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In mammals, the process of spermatogenesis or the formation of sperm requires a lower temperature than the normal body temperature to produce viable sperms. Hence, the sperms are stored outside the body in a sac-like structure called scrotum.
So, if the testes do not move from abdominal cavity to the scrotal sac, the sperms will not be formed.
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

How many sperms take part in fusion with female gamete?

  1. Only one

  2. Two

  3. Millions in number

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

The semen, secreted by male contains 100-200 millions of sperms. The healthy sperms in the semen then go to the cervix, then pass through the uterus and then ultimately arrive at the ampulla part of the fallopian tube where they come to meet the ovum. Although so many sperms encircle the ovum, only one sperm is allowed to penetrate the ovum.
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

In mammals, the testes lie in the scrotal sacs due to the

  1. Presence of urinary bladder

  2. Presence of rectum

  3. Long vas-deferens

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

The process of spermatogenesis or the formation of sperms require a lower temperature (1-6 degree C lower) than the normal body temperature to produce viable sperms. Hence, the sperms are stored outside in a sac-like structure called scrotum.
So, 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

Testes produce 

  1. Ovum

  2. Estrogen

  3. Sperm

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

  • The testes are the male gonad in the animals, produces sperm and the testosterone hormone and so is the primary male reproductive organ. 
  • Ovum is produced by the female reproductive organ, ovary, which is also responsible for the production of estrogen.

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

Each ejaculate of a man contains about how many sperm?

  1. 200

  2. 2000

  3. 200,000

  4. 200,000,000
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The number of sperm in an ejaculation vary widely depending on the various factors like health, age, stress and also including the time since last ejaculation. A healthy adult man can release between 40 million and 1.2 billion of sperms in a single ejaculation. Counts below 10 million is considered poor and the counts of 20 million or more are considered fine. 
So, the correct option is D.