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
Worldwide Responsible Accredited Production Worldwide Responsible Accredited Production Worldwide Responsible Accredited Production (WRAP), formerly Worldwide Responsible Apparel Production, is a not-for-profit 501(c)(6) organization dedicated to promoting safe, lawful, humane and ethical manufacturing around the world through certification and education. The WRAP certification program mainly focuses on the apparel, footwear and sewn products sectors. Created by a working group of the American Apparel & Footwear Association in 1997, WRAP became a standalone entity in 2000. While it was founded by clothing industry companies, WRAP's charter requires that a majority of its board members come from outside the apparel industry. The WRAP Principles are based on