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1. It is the firstly formed phloem.
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1. It is the later formed phloem.
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2. The elements of protophloem are slender and elongated.
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2. The elements are wide, long and conspicuous.
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3. It is subjected to stress due to elongation.
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3. Metaphleom elements are not subjected to elongation.
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4. Companion cells are rare or mostly absent.
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4. All phloem elements like sieve tube cells, companion cells, phloem parenchyma and phloem fibres are present.
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5. Protophloem elements are simple in nature.
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5. Metaphloem elements are complex in nature.
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