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B
Manoxylic and polyxylic
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C
Diploxyli
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D
Monoxylic
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Solution
The correct option is B Manoxylic and polyxylic The stem of Cycas is monoxylic when young(i.e., it has only a single ring of vascular bundles) but after secondary growth it becomes polyxylic (i.e., has many rings of secondary vascular tissues).