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B
Adiantum and Cucurbitaceae
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C
Marsilea and Botrychium
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D
Dicksonia and Maiden hair fern
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Solution
The correct option is A Osmunda and Equisetum
Ectophloic siphonostele is a monostele version of siphonostele. In this, a circular ring of xylem exists around the pith, and outside of xylem a ring of phloem is observed. It is found in flora section of the ecosystem.