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

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 '

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

In mammals, the testis is posteriorly connected to the scrotal sac by an elastic cord called

  1. Spermatic cord

  2. Rachis

  3. Gubernaculum

  4. Ligament
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In mammals in the embryonic stage, the testis is posteriorly connected to the scrotal sac by an elastic cord called as gubernaculum. It helps in the descent of testis during the 7th month of pregnancy. So the correct answer is C.

The spermatic cord in males is formed by the vas deferens and surrounding tissue that runs from the deep inguinal ring down to each testicle.

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

Structure absent in Frog's testis is

  1. Seminiferous tubules

  2. Seminal vesicle

  3. Sertoli cells

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

1. In frog,The mature spermatozoon is dependent upon external sources of nutrition so that it joins from 25 to 40 other spermatozoa, all of whose heads may be seen converging into the cytoplasm of a relatively large, columnar-type basal cell known as the Sertoli cell. This is functionally a nurse cell.

2. Spermatozoa are carried passively down the ureter to the slight dilation near the cloaca, known as the seminal vesicle. Within the vesicle the spermatozoa are stored briefly in clusters until amplexus and oviposition occur.

3. The spermatozoa are produced in subdivisions of the testes known as seminiferous tubules. These are closely packed, oval-shaped sacs, which are separated from each other by thin partitions (septula) of supporting (connective) tissue known as interstitial tissue.

So, the correct answer is 'None of the above'.

 

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

In most of the mammals, the testes remain enclosed in an extra-abdominal sac, the scrotum, where the temperature 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. No effect; germinal epithelium will carry out normal spermatogenesis

  2. Germinal epithelium will produce a large quantity of androgen secretion

  3. Germinal epithelium will produce more sperms

  4. Germinal epithelium will degenerate, resulting in sterility
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The scrotum is a pouch, suspended from the groin, that contains the testes and some of the male sex accessory ducts. One function of the scrotum is to help maintain the temperature necessary for spermatogenesis by locating the testes outside of the body cavity. The temperature in the human scrotum is 3.1 °C (5.6 °F) lower than the normal temperature within the body (37 °C, or 98.6 °F). If the temperature is maintained to the level of abdominal temperature, The germinal epithelium will degenerate resulting in sterility.

So the correct option is 'germinal epithelium will degenerate, resulting in sterility'.

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

Which of the following structures is incorrectly paired with its function?

  1. Gonads-gamete-producing organs

  2. Spermatheca-sperm-transferrring organ found in male insects

  3. Cloaca-commori opening for reproductive, excretory, and digestive systems

  4. Endometrium-lining of the uterus, forms maternal part of placenta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gonads- A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes (sex cells) and sex hormones of an organism. In the female of the species the reproductive cells are the egg cells, and in the male, the reproductive cells are the sperm.

Spermatheca- The spermatheca is an organ of the female reproductive tract in insects. Its purpose is to receive and store sperm from the male or, in the case of hermaphrodites, the male component of the body. 
Cloaca- In animal anatomy, a cloaca is a posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals, opening at the vent. All amphibians, birds, reptiles, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and faeces.
Endometrium- The endometrium is the inner epithelial layer, along with its mucous membrane, of the mammalian uterus. It has a basal layer and a functional layer; the functional layer thickens and then is shed during menstruation in humans, as well as some other mammals.
So the correct option is 'spermatheca- sperm-transferring organ found in male insects'.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Which one of the following statements is false in respect of viability of mammalian sperm?

  1. Sperm is viable for only up to $24$ hours

  2. Survival of sperm depends on the pH of the medium and is more active in alkaline medium

  3. Viability of sperm is determined by its motility

  4. Sperms must be concentrated in a thick suspension
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mammalian sperm viability is generally much longer than 24 hours in the female reproductive tract, often lasting several days depending on the species.

Multiple choice zoology animal diversity - ii (phylum: chordata) aves and mammalia classifications of chordata aves

Scrotum developed in metatheria occurs

  1. On sides of penis

  2. Behind penis

  3. In front of penis

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

Metatherians or marsupials are mammals mostly found in Central and South America and in Australia. They include animals like bilbies, wombat, and kangaroos et cetera. In contrast to placental mammals, their scrotum develops in front of the penis instead of behind it. 

So, the correct answer is 'In front of penis'.

Multiple choice biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

Development of an egg without fertilization is called

  1. Gametogenesis

  2. Parthenogenesis

  3. Abiogenesis

  4. Sporogenesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parthenogenesis, a reproductive strategy that involves the development of a female (rarely a male) gamete (sex cell) without fertilization. Parthenogenetic species may be obligate (that is, incapable of sexual reproduction) or facultative (that is, capable of switching between parthenogenesis and sexual reproduction depending upon environmental conditions). An egg produced parthenogenetically may be either haploid (i.e., with one set of dissimilar chromosomes) or diploid (i.e., with a paired set of chromosomes). The production of female offspring by parthenogenesis is referred to as thelytoky 

So the correct option is 'parthenogenesis'.

Multiple choice biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

Consider the following statements each with two blanks.
(A) Seminiferous tubules produce (i) while Leydig's cells produce (ii).
(B) In females, urethra is small and conducts (iii) while in males it conducts urine and (iv).
(C) The process Of formation of spermatozoa from spermatogonia is called (v) and the process of maturation of spermatids into spermatozoa is called (vi).
Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

  1. (i)-spermatozoa, (ii)-testosterone,

    (v)-spermatogenesis, (vi)-spermiogenesis

  2. (i)-testosterone, (ii)-spermatozoa, (iii)-urine, (iv)-semen

  3. (i)-estrogen, (ii)-testosterone, (v)-spermiogenesis, (vi)-spermatogenesis

  4. (iii)-urine, (iv)-semen, (v)-spermiogenesis, (vi)-spermatogenesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The seminiferous tubules are the location of the production of spermatozoa or sperms in the testicular lobule. The Leydig cells (interstitial cells) outside the seminiferous tubule synthesize and secrete testicular hormones called androgens or testosterone. Spermatogenesis is the process of immature male germ cells (spermatogonia) develop into mature sperms or spermatozoa. After this process, the conversion of the four equal haploid spermatids into spermatozoa (sperms) is called spermiogenesis. 

So, the correct option is '(i)-spermatozoa, (ii)-testosterone, (v)-spermatogenesis, (vi)-spermiogenesis'.

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Spermatogenesis is influenced by 

  1. Progesterone

  2. FSH

  3. STH

  4. LTH
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Spermatogenesis depends on the action of the FSH and LH hormone of the hypophysis on the testicular cells. LH acts on the interstitial cells, stimulating the production of testosterone necessary for the normal development of spermatogenic cells. FSH acts on the sertoli cells, stimulating adenylate cyclase and consequently increasing the presence of cAMP; it also promotes the synthesis and secretion of androgen-binding protein. This protein combines with testosterone and transports it into the lumen of the seminiferous tubules. 

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

When mammary glands of male develop similar to that of female, then this condition is known as:

  1. Gonochorism

  2. Gynaecomastia

  3. Feminism

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

Gynaecomastia is enlargement of the male breast tissue. Oestrogen stimulates breast tissue growth, while androgens inhibit it. The important factor is the ratio of active androgens to oestrogens. The ratio can be altered as a result of reduced testosterone production/action or enhanced oestrogen production/action or both. 

Multiple choice biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

I.C.S.H. in male acts on

  1. Cells of Leydig

  2. Sertoli cells

  3. Spermatids

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

In males, luteinizing hormone (LH) is also called as an interstitial cell-stimulating hormone (ICSH). It stimulates the production of testosterone by the Leydig cells. It acts synergistically with FSH.