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Ectophloic siphonostele is found in:

1. Osmunda and Equisetum
2. Marsilea and Botrychium
3. Adiantum and Cucurbitaceae
4. Dicksonia and Maidenhair fern

Correct answer: Osmunda and Equisetum

Solution

An ectophloic siphonostele has phloem only external to the xylem. Osmunda and Equisetum are standard examples showing this vascular arrangement, whereas the other options are associated with different stele types.

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