Question
Biology Question on Kingdom Plant
Ectophloic siphonostele is found in
A
Osmunda and Equisetum
B
Marsilea and Botrychium
C
Adiantum and Cucurbitaceae
D
Dicksonia and Maidenhair fern
Answer
Osmunda and Equisetum
Explanation
Solution
Stele is a column containing vascular tissues which is surrounded by pericycle and separated from ground tissue by endodermis. Siphonostele is medullated protostele or protostele with a central non-vascular pith. Leaf gaps are absent. Siphonostele is of two types : In Ectophloic siphonostele, central pith is surrounded successively by xylem, phloem, pericycle and endodermis. In amphiphloic siphonostele there is a central pith and xylem is surrounded on either side by phloem, pericycle and endodermis. It is found in Osmunda and Equisetum.