question_answer 23)

  The outermost and innermost wall layers of microsporangium in an anther are respectively. (a) Endothecium and tapetum                                   (b) Epidermis and endodermis (c) Epidermis and middle layer                                   (d) Epidermis and tapetum

Answer:

                  (d)A typical microsporangium is generally surrounded by four-wall layers, i.e., the epidermis, (outermost protective layer),endothecia, (middle fibrous layers) and the tapetum (innermost nutritive layer).