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Explain the types of Vascular bundle.

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Xylem and Phloem are present in the form of bundles called vascular bundles.

1. Radial 

2. Conjoint 

3. Concentric.

1. Radial vascular bundle : Xylem and phloem are arranged in an alternate matter or different radii are called Radial vascular bundle. 

Eg: roots

2. Conjoint vascular bundle : Xylem and phloem are arranged in the same radius are called conjoint vascular bundle. 

Divided in two types:

(a) Collateral vascular bundles : Xylem and phloem are arranged in the same radius with phloem towards the outside is called collateral vascular bundles. 

Eg: stem and leaf.

Collateral vascular bundles are of two types:

Open collateral vascular bundle: Vascular bundle consists of cambial tissue in between xylem and phloem are called Open collateral vascular bundle. 

Eg: Dicot stem

Closed collateral vascular bundle: Cambium is absent in vascular bundle are called Closed collateral vascular bundle. 

Eg: Monocot stem.

(b) Bicollateral : Phloem occurs on both the outer and inner side of xylem. This vascular bundle is Bicollateral vascular bundle. 

Eg: Cucurbita.

3. Concentric vascular bundle : The vascular bundle in which either phloem surrounds the xylem or xylem surrounds the phloem completely called Concentric vascular bundles. 

It is of two types: 

(a) Amphivasal, 

(b) Amphicribral.

(a) Amphivasal: The Xylem completely surrounds the phloem. 

Eg: Dracaena

(b) Amphicribral: The Phloem completely surrounds the xylem. 

Eg: Ferns

Exarch: Protoxylem vessels are present towards the periphery and meta xylem towards the centre. 

Eg: Root 

Endarch: Protoxylem are present towards the centre and meta xylem towards the periphery. 

Eg: Stem

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