| A | B |
|---|
| Wood | natural composite |
| Biomimetics | science of adapting nature's engineering methods to practical material problems |
| Cellulose | natural polymer made from glucose |
| Lignin | nature's matrix material for wood |
| Syndiotactic | orientation of regularly alternating side groups along backbone of polymer |
| Tensile strength | cellulose has greater ___ than that of steel (2) |
| Microfibrils | thin threads of tightly packed cellulose |
| Early wood | faster growing cells of wood with thinner walls and shorter and wider diameter cells (2) |
| Late wood | cells in wood with thicker walls |
| Compression wood | uneven growth from wind direction or shade in softwood trees (2) |
| Tension wood | uneven growth in hardwood trees caused by force of heavy top branches (2) |
| Porosity | ease of air or water to pass through tiny holes in a material |
| Hardwood | deciduous tree |
| Softwood | conifer (needles) |
| Vessels | large |
| Tracheid | long tubular cells that move water and minerals from the ground to the leaves |
