Question

Why do toads produce large numbers of eggs?

Answer 1

In frogs fertilization is external, means it takes place outside female body. So to increase the chances of fertilization frog produce large no. Of gametes and basically sprays them over eggs released by female.

Answer 2

Hey friend^^
Basically, gametes are sex cells. You need sex cells, like sperm and eggs, to reproduce. Frogs, just like many other species at the foundation of our food chain, produce large quantities of gametes. Evolution has favored them to do so, to enable them to maintain their population at healthy, stable levels.
Hope it helps^^
Sarah~