Pollen tube, Antipodal, Polar Nuclei, Egg cell, Synergids

Explanation: the path of a pollen tube from the pollen on the stigma into the embryo sac is as listed below (as shown in figure):

i. After the pistil selects the compatible pollen grain pollination takes place by pollen grain getting germinated on the stigma to produce a pollen tube. The pollen tube is generated from any of of the germ pores.

ii. The contents of the pollen grain now move into the pollen tube.

iii. Now the pollen tube grows through the tissue of the style and reaches the ovary.

iv. Now it enters the ovule through micropyle and enters the embryo sac through one of the two synergids. And the synergid is degenerated.