| 1 | The xylem of ferns and conifers contains only tracheids. | |
| 2 | The tensile strength of delignified tracheids is slightly less than that of virgin tracheids . | |
| 3 | It is found in protoxylem and first metaxylem tracheids and vessels. | |
| 4 | Fiber-tracheid An elongated cell with bordered pits found in wood, intermediate in form between a fiber and a tracheid. | |
| 5 | Tracheids have end walls and lateral walls with the same morphological characteristics or structure, with perforation plates or not. |