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 mendel's law of inheritance determination of sex sex determination sex determination in humans

In humans, an egg involved in male child formation has the genetic constitution of 

  1. 22 + X

  2. 22 + Y

  3. 44 + XY

  4. 44 + XX
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human follows XX- XY mechanism of sex determination. Human females have 46 chromosomes arranged in 22 homologous and homomorphic autosomes and two copies of X chromosomes as sex chromosomes (44+XX). Males have 22 homomorphic pairs and one heteromorphic pair, the XY pair (44+XY). During meiosis, all the gametes produced by females contain only the X chromosome (22 + X), whereas males produce two kinds of gametes, 1/2 gametes with X- and 1/2 with Y-chromosome (22 + X and 22 + Y). Fertilization of egg (22 + X) with sperm carrying 22+X chromosomes results in female child (44 + XX). Fertilization of egg (22 + X) with the sperm carrying 22+Y chromosomes results in a male child (44A + XY) as the zygote is a diploid structure and consists of two complete sets of chromosomes. Thus, the correct answer is option A.

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a .......... child.

  1. Female

  2. Either a male or female

  3. Male

  4. No child
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In human, the genetic makeup of female is XX and that of male is XY. Female ovum carries X chromosome, whereas the male sperm may carry either X chromosome or a Y chromosome. Therefore, if the sperm is carrying Y chromosome fertilizes an egg with X chromosome, the zygote develops into a male child.

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

When a sperm containing Y chromosome fertilises an egg with X chromosome, the zygote develops into a ______ child.

  1. Female

  2. Either male or a female

  3. Male

  4. No child
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a sperm containing Y chromosome fertilises an egg with X chromosome, the zygote develops into a male child with XY as the sex chromosome. Because Y chromosome is only found in males.

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

In humans, the composition of a zygote that will develop into a female is

  1. $44A + XX$
  2. $44A + XY$
  3. $22 + X$
  4. $23A$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A zygote is diploid. Hence it will have 44 autosomes. A sperm can have either of the two sex chromosomes X or Y while the egg has only one sex chromosome X. If the sperm containing the X chromosome fuses with the egg, the child born will be a female. If the sperm containing the Y chromosome fuses with the egg the child born will be a male. Thus the correct answer is option A.

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

Sex of the child is determined by the type of ................ provided by the father.

  1. Sperm

  2. Ovum

  3. Embryo

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

A human female produces only one type of ovum having half the number of autosomes and one X chromosome. However, a male produces two types of sperms having half the number of autosomes and either an X or a Y chromosome. In case, the sperm with X type of chromosome fertilizes ovum then a female child is produced and if the sperm with a Y chromosome fertilizes the ovum a male child is produced. Hence, the type of sperm that actually fertilizes the ovum determines the sex of the baby.

Multiple choice zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

Sperms are stored in earthworm after fertilization in 

  1. Kidney

  2. Testis

  3. Spermatheca

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

Earthworms are hermaphrodite animals, meaning that both testes and ovary are present in a single body but cross-fertilisation is the rule. At the time of reproduction two worms come to lie close to each other and exchange sperms. The sperms are stored in pouches called spermatheca. So, the correct answer is option C.

Multiple choice zoology frog earthworm - reproductive system reproduction in earthworm introduction to reproduction reproductive system in frog frog - digestive system, circulatory system, excretory system and reproductive system

Frog is 

  1. Reflex ovulator

  2. Spontaneous ovulator

  3. Non-ovulator

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

Frogs reproduce by external fertilisation. The female frog ovulates in the water and releases its gametes. The sperm released from the male frog fertilizes to form zygote which turns into a well-developed egg. So, the correct answer is option B.

Multiple choice biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

Secondary sexual character is

  1. Testis

  2. Ovary

  3. Beard

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

  • Secondary sexual characters are those that appear at the time of puberty while the primary sexual characters are present from the time of birth. 
  • These secondary sexual characters are caused by hormones released at the time of puberty.
  • Beard growth starts in the male at the time of puberty in the male because of increased secretion of testosterone.
So, the correct option is 'Beard'.

Multiple choice biology life processes in living organisms- part 2 earthworm - reproductive system reproduction in earthworm introduction to reproduction

The mammal whose testis come into scrotal sacs only during breeding time is

  1. Whale

  2. Bat

  3. Cat

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

Testes are the organs that produce the germ cells and scrotum is the pouch that contains the testes. The evolution of the scrotal sacs in mammals has been mysterious and there exist many hypotheses to explain the probable function of the scrotum. Primarily they provide a space, that isolate and serves to provide a temperature, lower than the body; essential for the production, maturation, and storage of sperm cells. Bats in this respect are unique and exhibit testicular migration between abdomen and scrotum, while the cauda epididymis is permanently in the scrotal sacs.

Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

Which of the following cells are present in mammalian testes and help to nourish sperms 

  1. Leydig cells

  2. Oxyntic cells

  3. Interstitial cells

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

Sertoli cells are non-gametic cells in the seminiferous tubules which provide nourishment for developing sperms.

Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

In most of the mammals the testes are situated outside the abdominal cavity because 

  1. Sperms produced in scrotal sac are more in number

  2. Sperms produced in abdominal cavity are provided with less motility

  3. Sperms produced in scrotal sac require lesser temperature for their best fertilization capacity

  4. Sperms produced in scrotal sac are bigger
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Testes in mammals are present out side the abdominal cavity because maturation of sperm needs low temperature. The temperature of scrotum is below (2 to 4$^{o}C$) than abdominal cavity.

Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

In mammals the testes lies in scrotal sacs due to-

  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

The testes in mammals are located outside the body cavity in the scrotum because spermatogenesis requires a temperature slightly lower than the core body temperature.

Multiple choice zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

During breeding season, nuptial pad is found in the thumb of

  1. Male frog

  2. Female frog

  3. Both of these

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

Frog exhibit sexual dimorphism. Male and female are distinguishable externally only during breeding season when the male develop roughed nuptial pads on the bases of the thumb. Nuptial pads help male in holding female, a sexual embrace called am plexus.