It is given in text that the red algae reproduce sexually by non motile gametes.also given that sexual reproduction in them is oogamous. Then plz tell me how can non motile gametes perform oogamy

see in oogamy one SMALL MOTILE MALE gamete fuses with one LARGE NON MOTILE female gamete. since fusion of gametes occurs its sexual reproduction and oogamy bcoz female is non motile and male motile...

hope this ans helps u...:):):)