Difference between parenchyma collenchyma and sclerenchya tissue????????

atleast  5 differences

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 Parenchyma - most abundant cell type in plants (e.g. cells making up the fundamental ground tissues; usually unspecialized; characteristics include: 
living at maturity with a very thin cell wall 
large vacuole for storage and sequestering of materials 
large amount of intracellular space 
spherical 
relatively regular shape 
very elastic (can change shape and then return to original shape with little deformation) 

Functions of parenchyma cells include: 
photosynthesis 
storage 
secretion 


Collenchyma - found just below the epidermis in petiole (e.g. celery stalks), leaves, and young stems; usually specialized; characteristics include: 
living at maturity 
irregularly thickened cell walls (+cellulose)
prism shaped 
plastic (can change shape but do not usually return to the original shape; remain deformed) 

Functions of collenchyma cells include: 
support 
some involvement in transport of nutrients 

Sclerenchyma - in mature parts of the plant, especially in woody plants and herbaceous perennials; specialized; characteristics include: 
dead at maturity - protoplast is absent 
very thick, sclerified cell wall (+lignin)
impermeable to water and other nutrients 
in cells specialized for transport of water and nutrients, the cell wall contains holes called pits. 

Functions include: 
support 
protection 
transport of water and nutrients 

Specific examples of sclerenchyma cells
fibers - long and slender 
sclerids (stone cells) - relatively spherical; the gritty texture of pears is due to the presence of stone cells.

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