Question

define the term internal and external fertilsation​

Answer 1

Answer:

Internal fertilization- Internal fertilization is the union of an egg cell with a sperm during sexual reproduction inside the female body.

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.

Answer 2

Answer:

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Internal fertilisation is the proces in which zygote forms inside female body .

for ex - in humans , cats , cow .

External fertilisation is the process in which zygote forms outside female body

for ex - in birds

ADDITIONAL INFORMATION

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Explaination in more detailed.

• When the male cell fuse with female egg it forms a zygote this process is called fussion.

• Zygote divides several times to form embryo .

• when the growth of this zygote occurs inside the female body it is called internal fertilisation.

if is it occur outside the female body i .e in the enviornment it is called external fertilisation.

Internal fertilisation -- happens in viviporous organism

Exterior fertilisarion - happens in ovipourous organism