A solution of known molarity is called a standard solution. Its concentration is determined by a process known as standardization. solution of known molarity is called a standard solution. Its concentration is determined by a process known as standardization.
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The cell cavity or lumen is very small or it may disappear completely. There are two types of sclerenchyma cells, namely sclereids and fibres.Sclereids: The cells are irregular in shape. The cell walls are thick, hard and lignified which makes the lumen very small. Simple pits (canals) are found in the thickened cell walls and link adjacent cells. Sclereids are commonly found in fruit and seeds.Fibres: The cells are needle-shaped with pointed tips, thick walls and rather small lumen. Secondary cell walls, impregnated with, are formed.