Why is it significant that pollen contains a multicellular male gametophyte instead of just male gametes? The non-gamete cells of the male gametophyte provide protection from desiccation and UV radiation. The non-gamete cells of the male gametophyte control the growth and development of the pollen tube. The non-gamete cells of the male gametophyte provide nutrition that supports the development of the embryo. The non-gamete cells of the male gametophyte undergo meiosis.