prepare a comparison table of parechyma collenchyma and sclerenchyma tissues
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Answer:
parenchyma:-
cells are isodiametric i.e.,equally expanded on all sides. They may be oval, round, polygon or elongated . Nucleus is present and hence living.
The cell walls are thin and made of cellulose.
cytoplasm is dense with a single large vacuole
intercellular spaces may be present.
May contain chlorophyll. parenchyma which contains chlorophyll are called chlorenchyma.
occurrence:- found in the cortex of root, ground tissue in stems and mesophyll of leaves
function:- store and assimilate food
give mechanical strength by maintaining turgidity.
collenchyma:-
the cells are elongated and are circular, oval or polygonal in cross-section. cell wall is unevently thickened with cellulose at the corners against the intercellular spaces.
nucleus is present.
vacuoles are small.
intercellular spaces are generally absent.
OCCURRENCE:- found under the skin i.e., below the epidermis in dicot stems.
FUNCTION:- provide mechanical support to the stem. Being extensible, these cells readily adapt themselves to the rapid elongation of the stem.
SCLERENCHYMA:-
the cells are long, narrow, thick and lignified, usually pointed at both ends. The cell wall is evenly thickened with lignin and sometimes is so thick that the cell cavity or lumen is absent.
nucleus is absent and hence the tissue is made up of dead cells.
OCCURRENCE:- found abundantly in stems of plants like hemp and etc.
FUNCTION:- gives mechanical support to the plant by giving rigidity, flexibility and elasticity to the plant body.
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Answer:
Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.
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