A new land plant has vascular tissues but no flowers or seeds. Which group does it belong to, and which significant challenge does this group face?
Pteridophyta; absence of seeds limits reproductive success
Pteridophytes such as ferns, horsetails and club-mosses are the first vascular land plants; they possess xylem and phloem for internal water and food transport, unlike the non-vascular bryophytes.
However, pteridophytes do not produce flowers or seeds. They reproduce by releasing spores, and their sperm still need a film of external water to swim to the egg, which restricts them to moist habitats and limits reproductive success.
Bryophyta is wrong because bryophytes lack vascular tissues altogether, whereas the plant in question has them. Angiosperms and gymnosperms both bear seeds, which contradicts the given description.
Hence, the plant is a Pteridophyte and its main challenge is that the absence of seeds limits reproductive success.
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