bryophytes and pteridophytes produce a large number of male gametes but relatively very few female gametes. why?

It is a evolutionary adaptation Both of them need water for reproduction and loss of gametes isnt uncommon The male gametes are produced in a larger quantity because not all of them are alike when it comes to viability just as the human sperms A definite percent of human sperms are healthy and motile This is just to ensure fertilisation which`ll ensure the formation or production of a progeny and there-by the continuation of life In short it is so to make up the loss of male gametes if any happens and that is why is a evolutionary step to ensure reproduction|