botany for high schools botany the gymnosperms other becomes a sperm mother cell called the generative cell or the body cell these cells move along in the apex of the tube the pollen tube rests in the nucellus during win ter the following spring it begins growth again and the nucleus of the generative or body cell divides into two sperm nuclei in the one cell the female prothallium endosperm is developed sterile part of male gametophyte ac central cell of an t fup cnnrp oof rra theridium vn vegetative nucleus or tube nucleus of spuic dbc iiulcl the si rh84k1.jpg from cell plankton español View Photo