DIFFRENCE BETWEEN METAXYLEM AND PROTOXYLEM ?

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Protoxylem is the first part of the primary vascular tissue in plants called xylem that matures. Its function is to transport water to the shoot in the early stages of the growth of the plant.
Metaxylem is a part of primary xylem that differentiates after the protoxylem.

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The first formed primary xylem is called protoxylem and the later formed primary xylem is called metaxylem.

In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called endarch. In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called exarch.

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Hi

Here is the answer to your question :

http://images.tutorvista.com/content/plant-histology/protoxylem-metaxylem-comparison.jpeg

Hope it helps....

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