AP BIOLOGY

Detailed explanation-1: -This is characterized by the production of two different types of spores, microspores that develop into unisexual male gametophytes, and megaspores which become unisexual female gametophytes.

Detailed explanation-2: -Selaginella is heterosporous, i.e. it produces two kinds of spores; microspores and megaspores. Spores are haploid and produced by meiosis in the spore mother cells. Spores germinate into male and female gametophytes. They are small but free-living, multicellular and photosynthetic.

Detailed explanation-3: -Heterosporous-Some genera like Selaginella and Salvinia produce two kinds of spores, macro (large) and micro (small) spores.

Detailed explanation-4: -Selaginella is heterosporous, forming two types of spores: one to four megaspores, usually in the lower part of the cone; and numerous minute, reddish to orange, microspores, usually in the upper part of the cone.