Topic 15: Seedless Vascular Plants
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What is a defining characteristic of the sporophyte generation in vascular plants compared to that of bryophytes?
Dominant, larger, and more complex generation in life cycle
The early vascular plant relative, ‘Aglaophyton’, exhibited features intermediate between bryophytes and true vascular plants. What was one of these intermediate features?
Had independent, branching sporophytes but lacked true vascular tissues
In the fern life cycle, what structure does the zygote develop into, and where does this development initially occur?
Develops into a new sporophyte, growing out from the archegonium of the gametophyte
Lycophytes and ferns are both seedless vascular plants. What is a primary morphological difference between most ferns and all lycophytes?
Ferns possess megaphylls, while lycophytes are characterized by microphylls
The vast forests of seedless vascular plants during the Carboniferous period had a major impact on Earth’s climate. What was this impact?
Their extensive photosynthesis reduced atmospheric CO2, contributing to global cooling
Which term describes the clusters of sporangia commonly found on the undersides of fern leaves?
Sori
Whisk ferns are monilophytes that lack true roots and leaves. According to the source material, what is the evolutionary explanation for this?
These structures were losed secondarily during their evolution