Vascular bundle
Vascular Bundle
Vascular bundle (pronunciation: /ˈvæskjʊlər ˈbʌndəl/) is a term used in botany to describe the arrangement of xylem and phloem tissues in plants.
Etymology
The term 'vascular' originates from the Latin word 'vasculum', meaning 'small vessel', while 'bundle' is derived from the Middle English word 'bundel', referring to a collection of things bound together.
Definition
A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in long, continuous systems throughout the plant. These systems are collectively called vascular bundles.
Structure
Each vascular bundle contains xylem and phloem. The xylem typically lies adaxial with phloem positioned abaxial. In a vascular plant, the vascular tissue is organized into many discrete vascular bundles.
Types
There are three types of vascular bundles:
- Radial vascular bundle: The xylem and phloem are arranged in an alternate manner on different radii.
- Conjoint vascular bundle: The xylem and phloem are situated on the same radius, with the phloem located towards the outside.
- Collateral vascular bundle: This is a type of conjoint vascular bundle where the xylem and phloem are arranged side by side.
Function
Vascular bundles are essential for the transport of water, minerals, and sugars to all parts of the plant. The xylem typically carries water and minerals from the roots to the leaves, while the phloem transports sugars from the leaves to the rest of the plant.
Related Terms
- Xylem
- Phloem
- Vascular tissue
- Vascular plant
- Radial vascular bundle
- Conjoint vascular bundle
- Collateral vascular bundle
External links
- Medical encyclopedia article on Vascular bundle
- Wikipedia's article - Vascular bundle
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