AP BIOLOGY

Detailed explanation-1: -Lycopodium, Equisetum, Psilotum are homosporous. Those plants which produce only one kind of spores are called homosporous.

Detailed explanation-2: -Option D: Lycopodium and Equisetum are both homosporous pteridophytes plants. Therefore, this is the correct option. Note: The pteridophytes that show homospory are Psilotum, Tmesiptris, Lycopodium, Equisetum, Phylloglossum etc. Mostly non-flowering plants are homosporous.

Detailed explanation-3: -Lycopodium is homosporous–all spores are roughly equal in size. Selaginella and Isoetes are heterosporous–spores are of two distinct sizes, microspores and megaspores. Lycopodium alopecuroides (below) is common in east Texas. Lycopodium alopercuroides strobili are not especially distinct from the rest of the plant.

Detailed explanation-4: -(B) Selaginella is a homosporous pteridophyte.

Detailed explanation-5: -Nearly all bryophytes and most pteridophytes have a homosporous life history (lower vascular plants). In pteridophytes, it is defined by physically identical spores that germinate to create bisexual (both male and female) gametophytes, however, it can be bisexual or unisexual.