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Question

When patches of phloem occur on both sides of xylem, then vascular bundle is called as

A
Radial
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B
Collateral
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C
Bicollateral
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D
Concentric
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Solution

The correct option is C Bicollateral
Vascular bundles wherein xylem and phloem lie on different radius are called as radial.
In conjoint vascular bundles, xylem and phloem together make bundles, which are present on same radius. A conjoint vascular bundle can be collateral or bicollateral.
Collateral vascular bundles have xylem and phloem arranged in same radium with xylem present towards inner side and phloem towards the outer side.
Bicollateral bundles have phloem on both sides of the inner xylem; here two phloem masses are separated from central xylem by two cambium strips in dicots.
Concentric vascular bundles are characterized by presence of one type of tissues surrounded by other type; they lack cambium and are always of closed type.

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