Question

Why do fish and frogs lay eggs in hundreds where as a hen lay only one at a time

Answer 1

Fish and Frog go by the process of external fertilization, in this process the female releases the eggs and males spray sperms on them .There are chances  that fertilization may not occur and other fish may also eat away the eggs , so fish lay eggs in huge number . In the case of hen the egg is already fertilized as hen follows internal fertilization process and hence only lays one at a time

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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