diffrentiate between parenchyma and collenchyma
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Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. ... Intercellular space between the cells is present in parenchyma cells, while in collenchyma cells less space is present between the cells and in sclerenchyma cells, intercellular space is absent due to which cells are tightly packed.
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a lens made by joining the parts of two spherical surfaces. = Concave lens
a lens made by joining thick lenses.= Concave lens
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