Epidermis, Endothecium, Middle layers, Tapetum are ______Apollen sac layersBwall of antherCpollen grain layersDepidermalAnswer: B. wall of anther Read Explanation: The aforementioned parts form the wall of the anther. Epidermis forms the first layer. It surrounds the meristematic cells in young anthers.The second layer is the endothecium. Third layer is the middle layers and the innermost layer is the tapetum. Read more in App