Because They Are Morphologically Simple,Psilotophyta Have Traditionally Been Thought to Be

question 28

Multiple Choice

Because they are morphologically simple,Psilotophyta have traditionally been thought to be a basal group in the radiation of land plants.Molecular phylogenies have challenged this hypothesis and support the alternative hypothesis that _____.

• A)they are the sister group to the seed plants
• B)they represent a grade rather than a monophyletic group
• C)they have lost complex structures in this lineage
• D)they represent a lineage that forms a monophyletic group with Lycophyta

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