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B
Dracaena and Yucca
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C
Helianthus and Cucurbita
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D
Maize and wheat
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Solution
The correct option is BDracaena and Yucca When xylem surrounds the phloem tissue from all sides the vascular bundle is called as 'amphivasal vascular bundle' or 'leptocentric type'. Such bundles are seen in monocot plant, like Dracaena after secondary growth.
Bicollateral vascular bundles are present in Helianthus and Cucurbita.
Maize and wheat has collateral closed vascular bundles. Cycas and Dryopteris has amphicribal vascular bundles. Thus, option B is correct.