Final answer:
Seedless plants are classified based on the presence of vascular tissue and structural features, while gymnospe-rms are categorized by their nak-ed seeds and pollination methods amongst other characteristics.
Step-by-step explanation:
Different seedless plants are grouped based on characteristics such as the presence or absence of vascular tissue, along with other structural features. Nonvascular seedless plants, which include bryophytes, lack specialized tissue for transporting water and nutrients and do not have true roots, stems, or leaves.
Seedless vascular plants, on the other hand, possess vascular tissue and are further classified into several major classes based on additional traits like the form of their life cycle, reproductive structures, and overall morphology.
In the case of gymnospe-rms , which are vascular plants with seeds but without flowers, they are grouped by features such as having nak-ed seeds, separate male and female gametes, pollination primarily through wind, and tracheids for water and solute transportation.
The diversity of plant forms and structures is a testa-ment to the evolutionary history of plants and the adaptations that have arisen to suit different environments and life strategies.