Since plant sperm are nonflagellated, how do they reach the ovule from the stigma?

Question

Quizplus · Accepted Answer

In flowering plants, the sperm cells are contained within pollen grains. After pollination, when a pollen grain lands on the stigma of a compatible flower, it germinates and grows a pollen tube down through the style to the ovary, where it delivers the sperm cells to the ovule for fertilization. This process does not involve the sperm cells swimming, being carried by air currents, or being delivered by insects directly. The ovules are not delivered to the stigma; rather, the pollen tube grows from the stigma to the ovule.

Since Plant Sperm Are Nonflagellated, How Do They Reach the Ovule