More than a quarter of the dry wood mass contributed by ________,a strengthening polymer,comes from the cell walls of ________ tissue.
A)cellulose;parenchyma
B)lignin;collenchyma
C)lignin;sclerenchyma
D)cellulose;sclerenchyma
E)suberin;parenchyma

Question

Quizplus · Accepted Answer

Lignin is a strengthening polymer and it contributes more than a quarter of the dry wood mass. It comes primarily from the cell walls of sclerenchyma tissue, which are known for their tough and rigid nature. Collenchyma tissue is also a type of supporting tissue, but it is not as heavily lignified as sclerenchyma. Parenchyma tissue provides many functions within a plant, but it is not considered a supporting tissue and it does not contribute significantly to the wood mass. Similarly, suberin is a fatty acid polymer found in the cork cells of plants, but it is not related to wood formation. Finally, cellulose is a major component of plant cell walls, but it is not a strengthening polymer like lignin.

More Than a Quarter of the Dry Wood Mass Contributed