Question

1. Most advanced stele in Pteridophytes
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Answer 1

Answer:

Polycylic Stele:

This type of stelar organization is the most complex one amongst all vascular cryptogams (pteridophytes). Such type of steles are siphonostelic in structure. Each such stele possesses an internal vascular system connected with an outer siphonostele.

Explanation:

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Answer 2

Answer

Plectostele most advance type of Potostele

Explanation:

central core of xylem is divide into no. of plates arranged parallel to each other