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 botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

When will sex determination in human take place?

  1. During fertilization

  2. When fertilised ovum takes place

  3. During sexual intercourse

  4. During fission of unfertilised egg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chromosomal sex determination is carried out at fertilisation. This is done based on the presence or absence of the Y chromosome. Either the X or Y chromosome from the sperm fuses with the X chromosome of the egg and so females have XX and males have XY. So, the correct option is 'During fertilization'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Fertilization can be correctly defined as fusion of

  1. Male and female pronuclei.

  2. Cytoplasm of male and female gametes.

  3. Two gametes.

  4. Male and female gametes of the same species.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sexual reproduction is a characteristic of animals, although many animals reproduce sexually as well asexually. Reproduction is essential to the survival of any species. Most animals are involved in some variety of sexual reproduction. The methods vary greatly from the simultaneous release of sperm and eggs into the water for many marine organisms, to fertilization inside the body for most terrestrial organisms and high degrees of parental care in birds and mammals.

Fertilization is defined as a process of fusion of male and female gametes. The gametes are special haploid cells. The most widely accepted definition of species is the biological species- according to which members of same species alone can carry on the process of sexual reproduction (including fertilization) and produce fertile offspring.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Type of fertilization (external or internal) depends on

  1. Structure of egg

  2. Site of embryo development

  3. Type of sperm

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

Aquatic animals like fishes and amphibia usually show external fertilisation, whereas terrestrial animals like reptiles, birds and mammals show internal fertilisation. Egg of animal showing external fertilization is not covered by a hard, protective shell and after fertilisation the embryo develops into larva in water. 

In terrestrial birds and reptiles the egg is covered with a hard, protective shell and development of embryo occurs inside egg. In mammals the egg is not covered by protective shell and fertilization is internal. After fertilization the zygote forms within the body of female animal and stays there till the formation of embryo.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Purpose of tubectomy is to prevent

  1. Fertilization

  2. Coitus

  3. Egg formation

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

Tubectomy is a surgical procedure for sterilization in which a woman's fallopian tubes are clamped and blocked, or severed and sealed, which prevents eggs from reaching the uterus for implantation, thereby no fertilization can takes place. It is considered the permanent method of birth control. 

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Arrange the following steps in proper order


a) Formation of zygote
b) Formation of embryo
c) Fusion of male and female gamete
d) Implantation of embryo into uterus

  1. a $\rightarrow$ c $\rightarrow$ d $\rightarrow$ a
  2. a $\rightarrow$ b $\rightarrow$ c $\rightarrow$ d
  3. c $\rightarrow$ a $\rightarrow$ b $\rightarrow$ d
  4. d $\rightarrow$ c $\rightarrow$ b $\rightarrow$ a
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1)fertilization starts with fusion of male gamete (sperm) and female gamete (zygote). 
2) this fusion results in the formation of zygote. 
3) Zygote divided repeatedly to give rise ball of cells that forms embryo.
4) after the formation of embryo is gets embedded in the wall of uterus where it further forms the foetus so the correct order is in above steps.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Fertilization is depicted by which of the following condition? 

  1. n $\rightarrow$ 2n
  2. 2n $\rightarrow$ 3n
  3. 2n $\rightarrow$ 4n
  4. 4n $\rightarrow$ 8n
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fertilization is the process of fusion of male and female gametes. Gametes are haploid (n) in nature and the fusion of the two results in the diploid (2n) product called as zygote. Zygote is the universal diploid cell. 

Thus, the correct answer is option A.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

In oogamy, fertilization occurs between

  1. Small non-motile female gamete and large motile male gamete.

  2. Large non-motile female gamete and small motile male gamete.

  3. A large non-motile female gamete and a small non-motile male gamete.

  4. A large motile female gamete and a small non-motile male gamete.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oogamy is a form of sexual reproduction. It is a form of anisogamy (heterogamy) in which the female gamete is significantly larger than the male gamete and is non-motile.The male gametes are  smaller in size and motile 
So, the correct option is 'Large non-motile female gamete and small motile male gamete'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Fusion of a male gamete with egg in embryo sac is

  1. Autogamy

  2. Syngamy

  3. Double fertilization

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

Syngamy and triple fusion are two events of sexual reproduction in plants. Syngamy is the fusion of one of the male gamete with the egg cell to produce a zygote while In triple fusion, second male gamete fuses with two polar nuclei to produce primary endosperm nucleus.

Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double Fertilisation.
So, the correct answer is 'Syngamy'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Which of the following is incorrect about fertilization?

  1. It restores diploid condition.

  2. It activates egg.

  3. There is no variation.

  4. It determines sex of offspring.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As the sperm reaches ovum to fertilize it, the ovum gets activated and completes its second meiotic division. After fertilization, a diploid zygote is formed. Fertilization also helps in determining the sex of the offspring. On the one hand, it leads to inherent qualities of a parent and on the other hand, it is the means for variations among the populations.

So, the correct option is 'There is no variation'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Male and female, both gametes arise from the same parent in

  1. Rabbit

  2. Humans

  3. Taenia

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Rabbit is a monosexual animal. Male gametes are produced by male rabbit and female gametes are produced by a female rabbit.
B. In humans, females produce eggs and males produce sperms. These gametes fuse to produce a new organism. 
C. Taenia, commonly known as Tapeworm, is a hermaphrodite organism. Each segment of a tapeworm, which is known as proglottid, consists of male and female reproductive systems.
Hence, both male and female gametes arise from the same parent in Taenia, as it is a hermaphrodite. So, the correct answer is 'taenia'.
Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Which of the following is correct about  internal fertilization and external fertilization?

  1. Internal fertilization- Fertilization inside the female body, External fertilization- Fertilization outside the female body.

  2. Internal fertilization- Fertilization outside the female body, External fertilization- Fertilization inside the female body.

  3. Internal fertilizatlon- Chances of the survival of the offspring are more, External fertilization- Chances of survival of the offspring are less.

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

Internal fertilization occurs inside the body whereas external fertilization happens outside the body.
External fertilization requires the presence of water for the sperm to be able to unite with the egg. Large number of offspring are produced but the chances of survival is very less.
With internal fertilization, the presence of water is not needed. Fewer young ones are produced because the mother's body will protect any fertilized eggs from being devoured by predators, so chances of survival is high.
Thus, the correct answer is option (D), 'Both A and C.'

Multiple choice female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

Which of the following is the correct order so as to be in a logical sequence?

  1. Implantation, Ovulation, Child birth, Gestation, Fertilisation.

  2. Coitus, Ovum, Sperm, Sperm duct, Urethra, Vagina.

  3. Sperm duct, Penis, Testes, Sperms, Semen.

  4. Puberty, Menopause, Menstruals, Menarche, Reproductive age.

  5. Graafian Follicle, Ovum, Fallopian Tube, Uterus.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A. The release of ovum occurs first, followed by fertilization, implantation in the uterus, gestation in which the foetus develops and then childbirth. So, the correct order is Ovulation, Fertilization, Implantation, Gestation, Childbirth

B. The sperm has to move to the sperm duct and through the act of coitus, it will de be inseminated in the vagina. So, the correct sequence is Sperm, Sperm duct, Urethra, Coitus, Vagina, Ovum.
C. Sperms are made in the testes and move to sperm duct where the secretion of glands combine with sperm to make semen. So, the correct sequence is Testes, Sperms, Sperm duct, Semen, Penis.
D. These are the reproductive stages in human female life-cycle. So, the correct sequence is Puberty, Reproductive age, Menarche,  Menstrual, Menopause.
E. These are the phases in the release of the ovum from the ovaries. So, the correct sequence is Graafian Follicle, Ovum, Fallopian Tube, Uterus.

Multiple choice female reproductive structure reproductive system of human hormones, homeostasis, and reproduction human physiology biology

The process of formation of ova is called

  1. Ovulation

  2. Oviparous

  3. Oogenesis

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Oogonia develops into the primary oocytes. In meiosis I the primary oocyte forms a polar body and a secondary oocyte. After meiosis I, the haploid secondary oocyte initiates meiosis II. When meiosis II is completed, an ootid and another polar body is created. Polar bodies degenerate at the end of meiosis II, leaving only the ootid that develops into a mature ovum. Thus the correct answer is option C.