Multiple choice Find true about structure of Microsporangium Circular in outline and surrounded by 4 wall layers Epidermis,Endothecium,Middle layers and Tapetum 3 layers gibes protection while Tapetum nourishes developing pollen grains All Reveal answer Fill a bubble to check yourself D Correct answer Explanation A microsporangium is circular, surrounded by four wall layers (epidermis, endothecium, middle layers, tapetum), and the tapetum provides nourishment.