The walls of collenchyma in shaken plants ( to mimic the effects of wind etc . ), may be 40 100 % thicker than those not shaken.
12.
Pectin and hemicellulose are the dominant constituents of collenchyma cell walls of dicotyledon angiosperms, which may contain as little as 20 % of cellulose in " Petasites ".
13.
Collenchyma provides extra structural support, particularly in regions of new growth . "'Sclerenchyma "'cells have thick lignified secondary walls and often die when mature.
14.
Unlike the collenchyma, mature sclerenchyma is composed of dead cells with extremely thick cell walls ( secondary walls ) that make up to 90 % of the whole cell volume.
15.
Parenchyma forms the " filler " tissue in the soft parts of plants . "'Collenchyma "'cells have thin primary walls with some areas of secondary thickening.
16.
Finally, some similar terms used in botany generally are differentiated by the suffix " a " : mesenchyma ( a tissue between xylem and phloem in roots ), collenchyma ( primordial leaf tissues ) and parenchyma ( supportive tissues ).
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