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Question

Do external fertilisation happen externally explain?

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Solution

The process of external fertilization is a physio -biochemical process by means of which the haploid sperms and ova unite together to form a diploid zygote.
  • External fertilization does not require specialized structures like placenta etc for survival of foetus
  • It is prevented from dessication by environment
  • There is a potential for high rate of reproduction
  • Parental care is not essential

    The main feature of external fertilization are:

  • Both the male and female parents interact only during a specific breeding period and spawning is observed
  • In some animals like fishes or certain frogs. the process differs a little where parental care is observed as far as care of the young are concerned
  • The eggs and the sperm are released together after a little sport ,under appropriate conditions of temperature, light, rainfall etc
  • The sperms find their way to the ova by chemo-taxis involving specific chemicals
  • The fertilized embryo develops inside the egg covered by thin shell, in certain cases, they may be carried by the mouth, or borne on the back
  • The developed embryo hatches into a larva which undergoes further development into fingerling, fry ,then into adult
  • The matured larva can undergo progressive metamorphosis as the tadpole larva develops into a frog

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