Pollen as large as about 90–100 µm. In angiosperms, during flower development the anther is composed of a mass of cells that appear undifferentiated, except for a partially differentiated dermis. As the flower develops, four groups of sporogenous cells form within the anther. The fertile sporogenous cells are surrounded by layers of sterile cells that grow into the wall of the pollen sac. Some of the cells grow into nutritive cells that supply nutrition for the microspores that form by meiotic division from the sporogenous cells. In a process called microsporogenesis, four haploid microspores are produced from each diploid sporogenous cell
Worldwide Responsible Accredited Production a facility. WRAP has also been a leader with its Fire Safety Awareness Course that focuses on the prevention of fires via the 5-step Risk Assessment Process In February 2018, WRAP became the official Corporate Social Responsibility partner of the American Apparel and Footwear Association. 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