CBSE Class 9 Answered
List out 5 differences between xylem n phloem(in a tabular form)
Asked by vk1994 | 05 Aug, 2008, 10:03: PM
Expert Answer
| Xylem | Phloem |
| Composed of tracheids, vessels,xylem parenchyma & xylem fibers. | Composed of seive tubes, companion cells,phloem parenchyma & phloem fibers |
| Tracheids, vessels & xylem fibers are dead cells whereas xylem parenchyma is living | Phloem fibers are dead whereas companion cells & phloem parenchyma are living. Seive tubes are living when young but on maturity they becomes dead |
| Mainly concerned with conduction of water & sap | Mainly concerned with conduction of organic compounds |
| Also provides mechenical support to the plants | DO not provide mechenical support |
| Lignin is present in tracheids & vessels | Lignin is absent in all types of phloem |
Answered by | 06 Aug, 2008, 04:20: PM
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