Pollen tube ____ from the pollen through a pore in the exine, to pierces the ____ and grows until it reaches the ____. The ____ divides by mitosis (as the pollen tube grows through the style) to produces two nuclei // ____ / 2 male gametes. The tube nucleus degenerates / disintegrate. One male gamete fuses with an ____ / ovum Forms diploid // 2n ____. Another male gamete fuses with two ____ to forms triploid / 3n ____.

Describe the process of double fertilisation beginning with pollen germination

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