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Ectophloic siphonostele is found in -
A
Osmunda and Equisetum
B
Adiantum and Cucurbitaceae
C
Marsilea and Botrychium
D
Dicksonia and Maiden hair fern
Detailed Solution
A siphonostele is a tubular stele in which the vascular tissue surrounds a central pith.
In an ectophloic siphonostele, the phloem is present only on the outer side of the xylem (external phloem), and the pith lies in the centre.
In an amphiphloic siphonostele (solenostele), phloem is present on both the outer and the inner sides of the xylem.
Ectophloic siphonosteles are found in Osmunda and Equisetum.
Amphiphloic siphonosteles are found in ferns such as Marsilea, Adiantum and Dicksonia.
So the ectophloic siphonostele is found in Osmunda and Equisetum.
In an ectophloic siphonostele, the phloem is present only on the outer side of the xylem (external phloem), and the pith lies in the centre.
In an amphiphloic siphonostele (solenostele), phloem is present on both the outer and the inner sides of the xylem.
Ectophloic siphonosteles are found in Osmunda and Equisetum.
Amphiphloic siphonosteles are found in ferns such as Marsilea, Adiantum and Dicksonia.
So the ectophloic siphonostele is found in Osmunda and Equisetum.