Select the incorrect statement about external fertilisation:
Organisms showing external fertilisation produce a large number of male gametes only.
External fertilisation is very uncertain and requires synchrony between release of male and female gametes.
It is replaced by internal fertilisation in higher organisms as it wastes energy and requires external medium like water.
It occurs in most of the fishes and amphibians.
As we learn
Disadvantage of external fertilisation -
A major disadvantage is that the offspring are extremely vulnerable to predators threatening their survival up to adulthood.