Notes on Sexual Reproduction in Animals | Grade 10 > Science > Reproduction | KULLABS.COM

Sexual Reproduction in Animals

Notes, Exercises, Videos, Tests and Things to Remember on Sexual Reproduction in Animals

Please scroll down to get to the study materials.

Registration open for Special Scholarships

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

Definitions

  1. Hermaphrodites: Those animals that contain both male and female reproductive organs in the same individual are called hermaphrodites.
  2. Fertilization: The process of fusion of male and female gamete is called fertilization.
  3. Internal fertilization: Fertilization, the process of fusion of male and female gamete, which takes place inside the female body, is called internal fertilization. It occurs in higher vertebrates. It is safer and no watery medium is required.
  4. External fertilization: Fertilization, the process of fusion of male and female gamete, which takes place out of the female body, is called external fertilization. It occurs in lower vertebrates. For this fertilization to occur water medium is required and it is not safe.

Procedure of sexual reproduction in animals

After meiosis, the male reproductive system produces sperm (male gamete) and the female reproductive system produces 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.

Difference between male and female gamete:

Male gamete Female gamete
1. It is also called microgamete, as it is smaller than female gamete. 1. It is also called mega gamete, as it is larger than male gamete.
2. It is motile as it can swim with the help of flagella. 2. It is immotile.
3. It is produced after meiosis in male reproductive cells. 3. It is produced after meiosis in female reproductive cells.

Difference between gamete and Zygote

Gamete Zygote
1. It is formed after meiosis in male and female reproductive cells. 1. It is formed after the fusion of male and female gamete.
2. It contains haploid number of chromosome. 2. It contains diploid number of chromosome.
3. Gamete does not divide further. 3. Zygote does divide further and give embryo.



  • Sexual reproduction in animals is the integrated processes of meiosis, mitosis, and fertilization.
  • Male gamete are micro gamete whereas female gamete are mega gamete.
  • Gamete is formed after meiosis in male and female reproductive cells.
  • Zygote is formed after the fusion of male and female gamete.
.

Questions and Answers

Click on the questions below to reveal the answers

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 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 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 inside the 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 brings about the evolution of organisms.

0%
  • Microgamete is a _______.

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

    Male gamete
    Zygote
    Gamete
    Female gamete
  • What is Zygote?

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

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

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

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

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

    formed after ovulation


    the locations on chromosomes where ova are produced


    ova that have not yet completed the oogenesis process


    the male equivalent of ova


  • 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 diploid number of chromosomes.
    Meiosis produces cells that have a haploid number of chromosomes
  • You scored /9


    Take test again

ASK ANY QUESTION ON Sexual Reproduction in Animals


You must login to reply

Forum Time Replies Report
No of chromosomes at gamate and zygote..???

In


You must login to reply