| 1. | The xylem of ferns and conifers contains only tracheids .
蕨类植物和针叶树的木质部仅含有管胞。 |
| 2. | Secondary xylem consists of pitted vessels, parenchyma fibers and rays .
次生木质部由孔纹导管、薄壁组织及射线所组成。 |
| 3. | A system confined to the transport of mineral elements is known as the xylem .
专门用来运输矿物元素的系统称为木质部。 |
| 4. | If timber poles are used, the bark can be peeled off the tops to expose the light colored sapwood .
如用圆木杆，可削去顶端树皮，露出木质部的明亮色泽。 |
| 5. | The stele includes all primary tissues derived from the procambium consists of pericycle，phloem and xylem .
中柱包括从原形成层衍生而来的全部初生组织，由中柱鞘、韧质部和木质部组成。 |
| 6. | In older stems, only the most recent rings of xylem participate in the transport of materials. these make up the sapwood .
在老茎中，仅最新的木质部环参与物质的运输。这些木质部环组成边材。 |
| 7. | Effects of xylem cavitation and embolism on plants
木质部空穴和栓塞化对植物的影响 |
| 8. | Study of vessel elements of secondary xylem in aquilaria agallocha
次生木质部导管分子研究 |
| 9. | Observation of vessel elements of secondary xylem in mangifera indica
芒果次生木质部导管分子的观察 |
| 10. | It consists of the protoxylem ( formed first ) and metaxylem
包括原生木质部（最早形成的）和后生木质部。 |
