Flowering Plants are Heterosporous.

It is heteresporous. Lycopodium, on the other hand, is homosporous.

Heterosporous is the name given to the plant that produces seeds in the ovaries.

Selagenella is heterosporous and it produces both micro- & megaspores in its micro- and megasporangia.

heterosporous means that male and female organs are different. One structure produces eggs and other produces sperm. If a plant has seeds, which contains the embryo, then that clearly means sexual fertilization and a male/female gametophyte had to be involved. In short, yes. All seed plants are hetrosporous by that logic.