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What are concentric bundles? Explain its...

What are concentric bundles? Explain its types.

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Vascular bundles in which either xylem completely surrounds the phloem or phloem surrounds the xylem is called concentric vascular bundle. It is of two types:
(i) Amphivasal : Xylem surrounds phloem. Eg : Dracaena
(ii) Amphicribral : Phloem surrounds xylem. Eg : Ferns
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