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B
Radial
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C
Concentric
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D
Bicollateral
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Solution
The correct option is B Radial Xylem and phloem together constitute a vascular bundle. They are arranged different types. In a collateral vascular bundle, xylem ring is inside and phloem ring is outside to phloem. Such arrangement is not present in root. In a concentric vascular bundle, one type of vascular tissue encircles the other. This type of arrangement is not present in root.
Bicollateral vascular bundle shows phloem ring inside and outside the xylem ring. It is absent in roots. Within a vascular bundle, when xylem and phloem are arranged in an alternate manner on different radii, the arrangement is called as 'radial'. Such, arrangement is present in root. Therefore, option B is correct.