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Collenchyma tissues are mainly found under the epidermis in young stems in the large veins of leaves. The cells are composed of living, elongated cells running parallel to the length of organs that it is found in. Collenchyma cells have thick cellulose cell walls which thickened at the corners. Intercellular air spaces are absent or very small. The cells contain living protoplasm and they sometimes contain chloroplasts.
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Collenchyma is a type of permanent tissue.The chemical which is deposited at the corner of a cell in collenchyma is pectin and cellulose. 
Collenchyma provide mechanical support to plants.
It also allows easy bending in various parts of a plant[leaves and stem] without breaking.
Collenchyma the cell wall is thick.
It is living cell there is very little intercellular space.

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