In plants which shed pollen in the two-celled condition:
Pollen tubes carry the two male gametes from the beginning.
The two male gametes are formed during the growth of pollen tube in the style.
Male gametes are not formed at all if the pollen is shed in two celled stage.
Pollen tube fails to germinate.
In plants which shed pollen in the two-celled condition the two male gametes are formed during the growth of pollen tube in the style.