It is composed of following five elements or cells.
Differences between xylem and phloem:
|It conducts water and minerals.||It conducts organic solutes or food materials.|
|Conduction is mostly unidirectional, i.e., from roots to apical parts of the plant.||
In it conduction may be bidirectional, i.e., from leaves to storage organs or growing parts or from storage organs to growing parts of plants.
|Conducting channels or tracheary elements are tracheids and vessels.||Conducting channels are sieve tubes.|
|Components of xylem include tracheids, vessels xylem parenchyma and xylem fibres.||Components of phloem include sieve tubes, companion cells, phloem parenchyma and phloem fibres.|
|Three of the four elements of xylem are dead (i.e, tracheids, vessels and fibres). Only xylem parenchyma is living.||Three of the four elements are living (i.e., sieve tubes, companion cells and phloem parenchyma). Only phloem fibres are dead.|
|In addition to conduction, xylem provides mechanical strength to the plant.||Phloem performs no mechanical function for the plants.|
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