Question

what is the meaning of siphonostele

Answer 1

a hollow tube of vascular tissue enclosing a pithand embedded in ground tissue.

Answer 2

ANSWER :-

Siphonostele is referred to as the kind of stele in which the pith is present in the centre of the stele.

Extra Information-

• According to the definition, Protostele with pith is called siphonostele or Medullated protostele is called siphonostele.
• The origin of pith may be intrastelar or extrastelar that is, cortex invasion is found occuring into the stele.
• It is of further two types-

1. Ectophloic siphonostele- Here, the phloem is present only on the outer side of the xylem. Examples of Ectophloic siphonostele are as follows- Osmunda , Scizaea , etc.
2. Amphiphloic siphonostele- Here, the phloem is present on both of the sides of the xylem. Examples of Amphiphloic siphonostele are as follows- Marsillea , Adiantum , Dipteris , Platyzoma , etc.