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WBCS Preliminary Examination 2017 — General Studies · Question 121 of 200

Q121
General ScienceBiology
The nature of stele in primitive vascular plants was
  1. a.Protostele
  2. b.Siphonostele
  3. c.Dictyostele
  4. d.Atactostele

Answer: (A) Protostele

The protostele — a solid, undivided central vascular core without pith — is considered the most primitive stele type, characteristic of early vascular plants.

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