Occurrence: They are located at the base of leaves or internode. e.g. stems of grasses and other monocots.
Function: They produce an increase in the length of an organ such as leaves and internodes.
Permanent tissues can be of two forms:
Difference between merismatic tissue and permanent tissue:
|Meristematic tissue||Permanent tissue|
|Its component cells are small, spherical or polygonal and un-differentiated.||Its component cells are large, differentiated with different shapes.|
|Cytoplasm is dense. Vacuoles are nearly absent.||
Large central vacuole occurs in living permanent cells.
|Intercellular spaces are absent.||Intercellular spaces are often present.|
|Cell wall of its cell is thin and elastic.||Cell wall of its cells is thin or thick.|
|Nucleus of each cell of this tissue is large and prominent.||Nucleus of each cell of this tissue is less conspicuous.|
|Its cells grow and divide regularly.||Its cells do not normally divide.|
|It is a simple tissue.||It can be simple, complex or specialized.|
|Its cells are metabolically active.||Metabolic rate of cells of this tissue is slow.|
|Cell organelles of its cells are simple.||Cell organelles of its cells are well developed.|
|Cells of this tissue do not contain crystals and other inclusions.||Cells of this tissue possess crystals and other inclusions.|
|Its cells are living.||Its cells may be living or dead.|
|It provides growth to the plant.||It provides protection, support, conduction photosynthesis, storage, etc.|
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