The stem of Selaginella is anatomically characterised by the presence of

Siphonostele

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Amphiphloic siphonostele

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Protostele

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Ectophloic siphonostele

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Solution

The correct option is B Protostele
The stem of Selaginella is formed of vascular stele which is protostele. Xylem is present in the center and is surrounded by phloem and phloem is surrounded by pericycle. Pith is absent. Trabeculae are present which are tube liked structures and are modified endodermal cells with casparian strips.

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