Question
Biology Question on Anatomy of Flowering Plants
Ectophloic siphonostele is found in:
A
Adiantum and Cucurbitaceae
B
Osmunda and Equisetum
C
Marsilea and Botrychium
D
Dicksonia and maiden hair fern
Answer
Osmunda and Equisetum
Explanation
Solution
An ectophloic siphonostele is a specific type of siphonostele, which itself is a stele consisting of a central core of pith surrounded by concentric layers of xylem and phloem. In the case of an ectophloic siphonostele, there is a ring of xylem surrounding the pith, with a ring of phloem located outside the xylem. This type of stele is exemplified by plants like Osmunda and Equisetum. Therefore, Osmunda and Equisetum are examples of plants that possess an ectophloic siphonostele.
So, the correct option is (B): Osmunda and Equisetum