Question

Ectophloic siphonostele is found in

• A. Osmunda and Equisetum
• B. Marsilea and Botrychium
• C. Adiantum and Cucurbita
• D. Dicksonia and Maidenhair fern

Answer 1

Answer: (A)

Osmunda and Equisetum

• Siphonostele is a stele consisting of a core of pith surrounded by concentric layers of xylem and phloem.
• Ectophloic siphonostele a monostele type of siphonostele in which a ring of xylem occurs around the pith, and a ring of phloem outside the xylem. For example, Osmunda and Equisetum'.
• Hence Ectophloic siphonostele is found in Osmunda and Equisetum.
• So, the correct answer is 'Osmunda and Equisetum'.