in Anatomy of Flowering Plants by

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DIFFERENCE BETWEEN PROTOXYLEM AND METAXYLEM?

  Protoxylem

Metaxylem

1. It is firstly formed xylem.

1. It is later formed primary xylem.

2. It is formed from the procambium.

2. It is formed from the fascicular cambium and inter fascicular cambium.

3. It is subjected to stress and strains.

3. These are not subjected to much stress and strains.

4. The secondary wall layer is deposited in the form of annular and spiral manner.

4. The secondary wall layer thickenings is in the form of reticulate or pits.

5. It lacks tyloses.

5. It contains tyloses.

6. The xylem elements are smaller in diameter.

6. The xylem elements are larger in diameter.

 

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