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Reproduction in Animals

Reproduction in Animals
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  • The process through which the production by living beings takes place to produce more living organisms of the same kind is known as Reproduction. 

Mode of Reproduction

  1. Asexual Reproduction

  • When a single parent is involved in the process of reproduction then it is known as Asexual reproduction
  • Example – microorganisms.

Science Class 8 Reproduction in Animals

  1. Sexual Reproduction

  • Sexual reproduction is a process in which two individuals are involved and a new individual is produced.
  • Example – Tiger, Human.

Science Class 8 Reproduction in Animals

Sexual Reproduction

  • The reproductive parts and organs in male and female are different in case of animals.
  • Zygote is produced by Gametes which are developed by the reproductive parts in animals.
  • A new individual is developed with the zygote.

Reproductive organs in Humans

  1. Male reproductive organs
  • A pair of testes
  • Two sperm ducts
  • One penis
  1. Male reproductive organs
  • A pair of ovaries
  • Uterus
  • Oviducts

Fertilization

  • Fertilization takes place with the fusion of male gamete and female gamete.
  • Zygote develops after the process of fertilization.

     

Science Class 8 Reproduction in Animals

Types of Fertilization

  1. Internal Fertilization
  • This fertilization takes place inside the body of animals.
  • Examples are dogs, humans, cows and hens.
  1. External Fertilization
  • When the fusion of male and female gamete takes place outside the body of the animal, then external fertilization takes place.
  • Examples are starfish, fish, etc.

Young ones to adults

  1. Direct Development
  • When the young animals develop into an adult then the process is called as direct development.
  • Examples are Monkey, men, hen, etc.
  1. Indirect Development
  • When the young one do not look like or resembles the adult one, then it is said to be an Indirect Development.
  • Examples are silk moth, butterfly, frog, etc.

Asexual Reproduction

  1. Budding

  • This process takes place in the multicellular organisms.
  • A bud gets developed and starts living as an individual after getting detached from the parent.
  • Examples are sponges and hydra.

Science Class 8 Reproduction in Animals

  1. Binary Fission

  • In unicellular organisms, this method is found.
  • Two daughter cells are developed in this process each with a nucleus and later become a complete adult.
  • Examples are Leishmania, paramecium, etc.

Science Class 8 Reproduction in Animals

Recap

  • The process through which the production by living beings takes place to produce more living organisms of the same kind is known as Reproduction.
  • When a single parent is involved in the process of reproduction then it is known as Asexual reproduction
  • Sexual reproduction is a process in which two individuals are involved and a new individual is produced.
  • Fertilization takes place with the fusion of male gamete and female gamete.

 

Comments

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Quiz for Reproduction in Animals

Q.1

The method of reproduction in amoeba is called:

a) binary fission
b) vegetative propagation
c) sexual reproduction
d) budding

Q.2

A human ovary releases ____ egg/s every month.

a) 2
b) 4
c) 1
d) 3

Q.3

Internal fertilisation does not take place in:

a) dogs
b) humans
c) birds
d) fishes

Q.4

Fertilisation of gametes results the formation of _______.

a) blastula
b) embryo
c) zygote
d) sperms

Q.5

Dolly was the name of:

a) first cloned rat
b) first cloned sheep
c) first cloned plant
d) first sheep

Q.6

Pick the odd one out:

a) eagles
b) crocodiles
c) turtles
d) dogs

Q.7

Asexual reproduction requires the presence of:

a) 1 parent
b) 2 parents
c) multiple parents
d) no parents

Q.8

During mitosis, a single cell divides into:

a) 2 gametes
b) 4 cells
c) 2 cells
d) 3 cells

Q.9

The release of an egg in a female is known as:

a) menstruation
b) ovulation
c) oogenesis
d) reproduction

Q.10

Oviducts are also known as:

a) urethra
b) ejaculatory duct
c) vas deferens
d) fallopian tubes

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