Question

what is the meaning of protostele

Answer 1

hey mate!!!!

here is the answer...

protostele means a simple conducting tissue in stem and roots of lower plants, consists of solid cylindrical of xylem surrounded by a layer of phloem....


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Answer 2

ANSWER :-

Protostele is referred to as the most primitive type of stele and all of the other kind of steles have been derived from it. -

• In the case of this kind of stele, the pith is completely absent.
• This primitive type of stele is found in Lygodium, Psilotum, Selaginella, etc.

Extra Information-

• Protostele consists of four further different types within itself. The types are as follows-

1. Haplostele- Here, solid round central core of xylem is surrounded by phloemand pericycle. Examples of species or cases where haplosteles are found are as follows- Selaginella kraussiana, Rhynia, Horneophyton, Cooksonia, etc.
2. Actinostele- Here, central xylem is star shaped with radiating arms and phloem is present in separate patches. Examples of species or cases where actinosteles are found are as follows- Asteroxylon, Lycopodium serratum, Psilotum, etc.
3. Plectostele- Here, xylem is present in the form of separate plates and phloem is present between these xylem plates. Example of species or cases where plectosteles are found are as follows- Lycopodium clavatum and Lycopodium volubile.
4. Mixed Protostele- Here, xylem is present in the form of discrete units embedded in phloem. Example of species or case where mixed protostele is found is as follows- Lycopodium cernuum.