Question

Why do fish and frogs lay hundreds of eggs whereas a hen lays only one at a time

Answer 1

eggs of fishes and frogs are not protected by egg shell as the hen's eggs are protected.
hundreds of eggs are layed as they are more prone to predators.

Answer 2

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Though these animals lay hundreds of eggs and release millions of sperms, all the eggs do not get fertilized and develop into new individuals. This is because the eggs and sperms get exposed to water movement, wind and rainfall. Also, there are other animals in the pond which may feed on eggs. Thus, production of large number of eggs and sperms is necessary to ensure fertilization of at least a few of them.

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