Question

Differentiate between internal fertillisation and externel fertillisation​

Answer 1

Answer:

internal fertilization

Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. ... Following fertilization, the embryos are laid as eggs in oviparous organisms, or continue to develop inside the reproductive tract of the mother to be born later as live young in viviparous organisms.

external fertilization

External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. ... The release of eggs and sperm into the water is known as spawning. In motile species, spawning females often travel to a suitable location to release their eggs.

Answer 2

Answer:

Internal fertilization is characterized by fertilizing the egg within the female body where as External fertilization is a mode of reproduction in which a male organism's fertilizes a female organism's egg outside of the female's body.

     External Fertilization                                    Internal Fertilization

1. Takes place outside the                           1. Takes place inside the female’s

female’s body.                                               body

2. Organisms that use external                  2. Animals that have internal        

fertilization to reproduce must                      fertilization have completely

either live in the water or return to             transitioned to life on land.

the water for reproduction.

3. Usually, a large number of gametes     3. Male gametes are released

are released in the surrounding                 inside  the body of the female by a

medium .                                                        copulatory organ.

Examples: Fish, Amphibians, etc.               Examples: Reptiles, Birds, Mammals.