discusd the evolution of stellar system in pteridophytes. answer me with in 100 to 150 words
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Ø A stele in which the vascular core consists of a solid core of xylem and it is surrounded by phloem, pericycle and endodermis is called protostele. ... Ø Protostele represents the simplest stellar organization in vascular plants. Ø Majority of the Pteridophytes show protostelic condition in their rhizome, stem or roots.
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