Classification of meristematic Tissue,Promeristem or Primordial meristem,Primary meristem,Secondary meristem,Apical meristem, Intercalary meristem,Lateral meristem

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Classification of meristematic Tissue

(a) Based on origin and development
it is of three types
1. Promeristem or Primordial meristem
It is also called embryonic meristem. It occurs at the tip of stem and root. it give to primary meristem by cell division. It is the region of few growth in plant body where foundation of new organs is initiated.

2. Primary meristem
It arises from Promeristem and is present on apices of root, stem and leaf. It give rise to many permanent tissues making the fundamental structure of plant body

3. Secondary meristem
Secondary meristem has been formed from permanent tissues which are responsible for increases in girth. Cambium of root, interfasicular cambium of stem, cork cambium of both roots and stem are secondary meristems.
(b) Based on position of meristem
It is of three types:
1. Apical meristem
It is present at the tip of stem, root and branches. They are responsible for growth in length.

2. Intercalary meristem
These are portions of apical meristems, which get separated by intervening permanent tissues and are responsible for elongation of stem. They are found either at the base of leaf or base of internodes of just below the nodes.

Various Meristems

Tunica Corpus Shoot Apex

Shoot Apex

3. Lateral meristem
It is a secondary meristem which occupies lateral position e.g. Cambium, Cork cambium. It is responsible for increases in girth.
(c) Based upon functions
It was given by Haberlandt. It is also of three types:
1. Protoderm
It is the meristem which forms the outer covering of stem, root and leaf in form of epidermis.

2. Ground meristem
It is the meristem where ground tissue occur.

3. Procambium
It occurs inside the ground meristem forms vascular tissue system. It conducts food and water to the vascular bundles.

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Anatomy of Flowering Plants Tissue and Meristematic Tissue Classification of Meristematic Tissue Apical Meristems of Stem and Root Permanent Tissue Simple Permanent Tissue Complex Tissues - Xylem Types of Xylum Complex Tissues - Phloem Classification of Permanent Tissue on Basis of Their Functions Types of Vascular Bundles Anatomy of Monocot Stem - Maize, Primary Structure of Stem Anatomy of Dicotyledonous Stem - Sunflower Stem Secondary Growth in Dicot System Origin and Activity of Cambium Origin and Activity of Cork Cambium Heart Wood and Sap Wood Primary Structure of Monocot Root Primary Structure of Dicot Root Secondary Growth in Dicot Roots Origin and Activity of Vascular Cambium Origin and Activity of Cork Cambiums Internal Structure of Dicot Leaf Internal Structure of Xerophytic Leaf Internal Structure of Monocot Leaf - Isobilateral Leaf