Pollen tube through wind, water or pollinators. The last step before fertilization is the growth of the pollen tube to transfer non-motile sperm to the protected egg. Pollen tubes are unique to plants and their structure had evolved over plant history. The pollen tube formation is complex and the mechanism is not fully understood, but is of great interest to scientists. Pollen is produced by the stamen, the male reproductive organ of the flower. Each pollen grain contains a vegetative cell, and a generative cell that divides to form two sperm cells. The pollen is delivered by the opening of anthers for
Grains of Selim stews. Other regional names include "kimba" and "kili". In Senegal, The grains are a key ingredient in Touba-style coffee (called in French). Near the end of the roasting phase of making the coffee, grains of Selim, known in Wolof as , are added while the heat is still on. Roasting continues for approximately five more minutes; during this time the sneeze-producing scent of pepper becomes easily discernible. Grains of Selim Grains of Selim are the seeds of a shrubby tree, "Xylopia aethiopica", found in Africa. The seeds have a musky flavor and are used as a spice in a manner