Question

how is fertiliation in a hen different from fertiliation in a frog

Answer 1

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Hens are oviparous in which internal fertilisation takes place. The fertilised egg develops into an embryo inside the body. However, the development of chick from the embryo takes place outside the body.
Frogs are oviparous in which both fertilisation and development of zygote to embryo and young ones occurs outside the body.


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Answer 2

They both are oviparous but there is main difference. In frog the egg is inside the water and there is no contact between them.  But hen it is under the body in this condition there is contact between egg and the hen.  Egg of frog is like soft jelly but hen's egg is little hard