15.Prothallus is A. Gametophyte, dioecious, autotroph present in Pteridophytes B. Gametophyte, monoecious, autotroph found in bryophytes C. Sporophyte, dioecious, hetorotroph found in bryophyte D. Gametophyte, monoecious, autotroph present in Pteridophytes
Option D A prothallus, or prothallium, is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well. In lichens it refers to the region of the thallus that is free of algae.
