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

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 animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

When the sperms of Funaria and Pteris are put together
near the archegonia of Pteris, only the sperms of Pteris
readily enter the archegonia and reach the egg. The reason
being that

  1. Sperms of Funaria are killed when mixed with sperms

    of Pteris

  2. Archegonia of Pteris secrete a substance with repels

    sperms of Funaria

  3. Archegonia of Pteris secrete a chemical substance which

    attracts sperms of Pteris thermostatically

  4. Sperms of Funaria are less motile
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Because archegonia of pteris secrete a chemical malic acid which attracts only sperms of Pter!s thermostatically.

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

A prezygotic isolating mechanism prevents successful

  1. gamete production

  2. fertilization

  3. zygote development

  4. reproduction of hybrids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Species are kept distinct from one another by prezygotic and postzygotic barriers. These barriers keep organisms of different species from mating to produce fertile offspring, acting before and after the formation of a zygote, respectively. These barriers maintain the reproductive isolation of species.
So, the correct answer is 'zygote development'

Multiple choice zoology diversity in living world hemichordata phylum hemichordata chordates and hemichordates

In Balanoglossus 

  1. Sexes are united and fertilization is external

  2. Sexes are separate and fertilization is external

  3. Sexes are separate and fertilization is internal

  4. Sexes are united and fertilization is internal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Balanoglossus is a hemichordate acorn worm. It is the connecting link between invertebrates and vertebrates. It is basically a bottom-dwelling marine worm. It is tubicolous, that is, lives inside U-shaped burrows or tubes in the sand.  In Balanoglossus, the sexes are separate and prominent sexual dimorphism does not exist and fertilization is external, that is, it takes place outside the body of the organism.

So, the correct answer is 'Sexes are separate and fertilization is external.'.

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 botany reproduction in angiospermic plants artificial vegetative propagation asexual modes of reproduction common modes of vegetative propagation

The term scion is used in 

  1. Embryology

  2. Grafting

  3. Agamospermy

  4. Emasculation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Embryology is the science of development of the embryo. It is a branch of science which deals with the development of gametes, fertilization, and development of embryos.
Scion is the detached living part of the plant which is grafted to the stalk by the process of grafting. Grafting is a horticulture technique where the living detached portion of the plant is used to regenerate the growth. One plant is selected for its roots and this is called the stock or rootstock. The other plant is selected for its stems, leaves, flowers, or fruits and is called the scion. The joining of scion and stalk is known as inosculation. The techniques are mostly used in the asexual mode of reproduction. 
Agamospermy is an asexual reproduction in which seeds are produced from unfertilized ovules.
The removal of the anthers of a flower in order to prevent self-pollination is known as emasculation.
So, the correct answer is option B.
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 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.

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

Leydig cells are meant for 

  1. Formation of sperm

  2. Production of progesterone

  3. Production of testosterone

  4. Nutrition of sperm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH).