Final answer:
Seedless vascular plants are categorized based on spore population, which are crucial for their reproduction. Groups like lycophytes and ferns have distinct spore-producing structures like sporangia and strobili.
Explanation:
Seedless vascular plants are grouped based on the characteristic of spore population. Spores are the reproductive structures in these plants responsible for their propagation. Different groups of seedless vascular plants include lycophytes and ferns, each with unique spore-producing structures such as sporangia and strobili.
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