Question

What happens when the pollen tube tip enlarges and ruptures inside the embryo sac?

Options

• It releases the entire pollen grain contents

• It dissolves without releasing any contents

• It releases two male gametes and the vegetative (tube) nucleus

• It releases only the tube nucleus

Answer 1

When the pollen tube tip enlarges and ruptures inside the embryo sac, it releases its contents, which include two male gametes and the vegetative (tube) nucleus. These released gametes are then available for fertilisation of the egg cell and polar nuclei.