Videos Related with Sexual Reproduction

Note on Sexual Reproduction

  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz

Sexual reproduction

The reproduction that takes place with the fusion of male gamete and the female gamete is called sexual reproduction. Such reproduction usually occurs in animals and higher plant. Two parents male and female are involved in this process of sexual reproduction. In most of the animals, male and female are separate. Such animals are called uni-sexual. Man, birds, etc. in animals and papaya, pumpkin, etc. in plants are the examples of unisexual. In some animals, male reproductive organ and female reproductive organ are present in one animal. Such animals are called bisexual organisms. These organisms are also called hermaphrodite. Hydra, Earthworm. The mustard plant, etc. are the examples of bisexual organisms.

Sexual reproduction in plants

Reproduction takes place in the flowers of the plant. The male organ of flower is androecium and female organ of flower is gynoecium. Androecium produces pollen grains whereas gynoecium produces ova. Fusion of pollen grains and ova leads to fertilization. The zygote starts to form after fertilization.


Sexual reproduction in animals

There is no asexual reproduction in animals. After the sexual intercourse between male and female, the female is able to conceive the baby. After meiosis, the male reproductive system produces sperm (male gamete) and the female reproductive system produces an egg (female gamete). Then male releases its gamete that fuses with female gamete. The fusion may be internal (in higher organisms) or external (in lower organisms). If it is external then a medium, that carries male gamete, is required and mostly it is water. After fertilization, the egg becomes zygote and undergoes mitosis to become an embryo. Embryo again with the help of mitosis becomes a new individual.

In animals, there are two types of fertilization. They are:

  1. External fertilization: Fertilization that takes place outside of the body is called external fertilization. Frogs and fishes do external fertilization.
  2. Internal fertilization: Fertilization that takes place inside of the body is called internal fertilization. Most of the animals does internal fertilization. Example: Humans

  • The reproduction that takes place with the fusion of male gamete and female gamete is called sexual reproduction.
  • Fusion of pollen grains and ova leads to fertilization.
  • Fertilization that takes place outside of the body is called external fertilization. 
  • Fertilization that takes place inside of the body is called internal fertilization. Most of the animals does internal fertilization.
.

Very Short Questions

The reproduction that takes place with the fusion of male gamete and the female gamete is called sexual reproduction. The types of reproduction are:

  1. sexual reproduction in male
  2. sexual reproduction in female

The fusion of male gamete and female gamete during the sexual reproduction of organism is called fertilization.

External fertilization

Internal fertilization

i. The fusion of male and female gametes takes place outside the female's body.

ii. The embryo is not protected from external injuries as it develops outside.

i. The fusion of male and female gametes takes place inside the female's body.

ii. The embryo is protected from external injuries as it develops inside the female's body.

Ovum

Zygote

i. It is produced by females through the meiosis cell division of reproductive cells.

ii. It is haploid (n) in nature, i.e. it has half the number of chromosomes as that of the parent cell.

iii. It does not have an independent existence.

i. It is formed as a result of the fusion of male and female gametes.

ii. It is diploid (2n) in nature, i.e. the chromosomes exist in pair.

iii. It has an independent existence.

Pollination

Fertilization

1. It is the transfer of pollen grains from stamen to stigma.

2. It takes place outside the ovary.

1. It is the fusion of male gamete with the female gamete.

2. It takes place inthe ovary.

The reproduction in which male and female gametes fuse to form a zygote is called sexual reproduction. Sexual reproduction brings variation among the offspring of the same parents. So, sexual reproduction is necessary for the evolution and origin of new species.

The organism that has both male and female reproductive parts in the body is called hermaphrodite. As earthworm has both male and female reproductive parts in itself, it is a hermaphrodite.

The two significances of sexual reproduction are:

  1. Due to the increase in the number of organisms, the race of a species is maintained.
  2. Due to crossing over and fusion of male and female gametes, variation that results bringabout the evolution of organisms.

Male gamete

Female gamete

1. It is smaller in size.

2. It is highly active.

1. It is bigger in size.

2. It is inactive.

Endosperm

Zygote

1. It is formed due to the fusion of male gamete and two polar nuclei.

2. It is triploid (3n) in nature.

1. It is formed due to the fusion of male gamete and an ovum.

2. It is diploid (2n) in nature.

0%
  • Microgamete is a _______.

    asexual gamete
    Male gamete
    Female gamete
    Zygote
  • Which one is motile and swim with the help of flagella?

    Zygote
    Female gamete
    Male gamete
    Gamete
  • What is Zygote?

    Formed after the fusion of male and female gamete.
    Both a and b
    Process of fusion of male and female gamete
    Formed after meiosis in male and female reproductive cells.
  • Somatic cells reproduce by ______, while sex cells reproduce by ______.

    mitosis; mitosis


    meiosis; mitosis


    mitosis; meiosis


    meiosis; meiosis


  • Which of the following statements about human reproduction is true?

    Oogenesis takes place in the ovaries of females.
    Mitosis in males is also known as spermatogenesis.
    Sperm and ova are zygotes.
    Mitosis in females is known as oogenesis.
  • Which of the following statements is true about mitosis in humans?

    Mitosis occurs in the spermatocytes.
    All cells of the body go through mitosis more or less constantly from conception until death.
    It takes roughly two weeks for a cell to go through all six phases of mitosis.
    Each cell undergoing mitosis divides into two complete new cells that are usually identical to the cell from which they originated.
  • Which of the following statements is true about meiosis in humans?

    Sperm and ova are not identical to the parent cells that produced them.
    Females produce far more gametes than do males.
    none of the answers are right
    The process begins in males and females at puberty.
  • Ocytes are ______.

    the male equivalent of ova


    ova that have not yet completed the oogenesis process


    the locations on chromosomes where ova are produced


    formed after ovulation


  • Which of the following statements is true in humans?

    Both cell division produces equal set of chromosomes.
    Mitosis produces cells that have a haploid number of chromosomes.
    Meiosis produces cells that have a haploid number of chromosomes
    Meiosis produces cells that have a diploid number of chromosomes.
  • Process of fusion of male and female gamete is ______.

    Reproduction
    Self-pollination
    Fertilization
    Pollination
  • Process of reproduction where formation of isogametes takes place is called ______.

    Fertilization


    Conjugation


    Reproduction


    Pollination


  • Which one is also called female flower?

    Pistillate flowers
    Unisexual flowers
    Staminate flowers
    Bisexual flower
  • Which one is incomplete flowers?

    Unisexual flowers
    Bisexual flower
    Pistillate flowers
    Staminate flowers
  • The process of transfer of pollen grains from anther to stigma of a same or different flower is called ______.

    All
    Pollination
    Reproduction
    Fertilization
  • Fusion of pollen grains and ova leads to ______.

    fertilization


    germination


    pollination


    dispersion


  • You scored /15


    Take test again

DISCUSSIONS ABOUT THIS NOTE

You must login to reply

Forum Time Replies Report

Ask any queries on this note.steps of delivering in human


You must login to reply

esther

steps of delivering in human


You must login to reply

esther

can a woman have sex during gestation period


You must login to reply