Question

Discuss the evolution of stellar system in Pteridophytes...​

Answer 1

Answer:

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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Answer 2

Answer:

Stele is the central cylinder or core of vascular tissue in higher plants and Pteridophytes. It consists of xylem, phloem, pericycle and medullary rays and pith if present. Van Tieghem and Douliot (1886) introduced this term and put forward the stelar theory.