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1. It is firstly formed xylem.
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1. It is later formed primary xylem.
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2. It is formed from the procambium.
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2. It is formed from the fascicular cambium and inter fascicular cambium.
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3. It is subjected to stress and strains.
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3. These are not subjected to much stress and strains.
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4. The secondary wall layer is deposited in the form of annular and spiral manner.
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4. The secondary wall layer thickenings is in the form of reticulate or pits.
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5. It lacks tyloses.
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5. It contains tyloses.
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6. The xylem elements are smaller in diameter.
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6. The xylem elements are larger in diameter.
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