Question

why do frogs produce a large number of gametes explain the life cycle of a frog

Answer 1

It is because when male frog will come to fertilise till then many of them are eaten by others or destroyed. .so to maintain the quantity to produce new generation!

Answer 2

Amphibians like frogs reproduce by external fertilization. That is, the female and male gametes fuse outside the frog's body. This usually happens in water, thus there is a possibility that the male gametes never make it to the eggs, unless there are lots of them.