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 List any 6 differences between Xylem and Phloem???

Asked by Ved Padmawar(student) , on 13/9/12

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Phloem  and  xylem  are complex tissues that perform transportation of  food  and water in a plant. They are the vascular tissues of the plant and together form vascular bundles. They work together as a unit to bring about effective  transportation of food, nutrients,  minerals  and water.

 

                                                                          PHLOEM                                                         XYLEM

Function: Transportation of food and nutrients from leaves to storage organs and growing parts of plant. Water and mineral transport from roots to aerial parts of the plant.
Movement: Bidirectional (Moves up or down the plant 's stem from "source to sink") Unidirectional (Moves up the plant 's stem)
Occurrence: Roots, stems and leaves Roots, stems and leaves
Additional Functions: Forms vascular bundles with xylem Forms vascular bundles with phloem and gives mechanical strength to plant due to presence of lignified cells.
Structure: Tubular with soft walled cells Tubular with hard walled cells
Elements: Sieve tubes, companion cells, phloem parenchyma, bast fibers, intermediary cells Tracheids, vessel elements, xylem parenchyma, xylem sclerenchyma
Nature of tissue: Living tissue Non living tissue at maturity

 

Image:Xylem-and-Phloem.jpg

Posted by Pradeep Ch(student)on 13/9/12

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Xylem:

  1. It conducts water and minerals.
  2. It consists of many dead elements.
  3. Components of xylem include tracheids, vessels , xylem parenchyma and xylem fibres.
  4. three of the four elements are dead. only xylem parenchyma is living.
  5. In addition to conduction , xylem provides mechanical strength to plant.
  6. Conduction is mostly undirectional , i.e. , from roots to apical parts of the plant.

Phloem:

  1. It conducts organic solutes or food materials.
  2. It consists of leaveing tissue.
  3. Components of phloem include sieve tubes , companian cells , phloem parenchyma and phloem fibres.
  4. Three of four elements are living.Only phloem fibres are dead.
  5. Phloem performs no mechanical function for the plants.
  6. In it conduction may be biodirectional ,i.e., from leaves to storage organs to growing parts of plants.

Posted by Bhawna Minhas(student)on 14/9/12

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