Question

why do fish and frog lay hundred of egg at a time where as hen lay only one egg at a time

Answer 1

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Organisms having internal fertilization, like hen, produce one egg at a time. This is so because here there is less chance of failure of fusion between male and female gamete. After the gametes are fertilized there is just the need of development of animal in the form of egg. Frog like aquatic organisms who shows external mode of reproduction have to lay egg in hundred. The first reason behind this is the single egg is so small in size that it will not be possible to stay to definite position and which in turns make hard for sperm to found and fuse them. Whereas, when large number of eggs make them stick together this makes fertilization possible. Another reason behind this is there is a lot of organisms who feed on these eggs, so larger number of eggs gives more possibility of giving birth to young ones


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Answer 2

because in fish and frog external fertilisation takes place where there is no security for eggs(the eggs may become food for other animals or they may damage in run off etc)
but in hen internal fertilisation takes place where complete security is given to the eggs by mother.
fish and frog lay hundreds of eggs so that at least some of them can hatch and grow into younger ones