Which of the following occurs in angiosperms but not in gymnosperms?

Question

anonymous · Answer

double fertilization

koikkara · Answer

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anonymous · Answer

Wind pollination: gymnosperms 
Animal pollination: angiosperms 
Pollen grain: both 
Pollen tube: both 
Fertilization quickly following pollination: gymnosperms 
Double fertilization: true double fertilization only happens in angiosperms where a zygote and an endosperm are created. However, in gymnosperms double fertilization occurs in the phylla Gnetophyta (in the genera Ephedra and Gnetum) *two zygotes are created, no endosperm 
Embryo sac: i think both 
Endosperm: angiosperm