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B
Vascular rays
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C
Vessels
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D
Tracheids.
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Solution
The correct option is D Medullary rays
Medullary rays are cellular structures found in some species of wood. They appear as radial planar structures, perpendicular to the growth rings, which are visible to the naked eye. Most of these cells transform into xylem and phloem. But certain cells don't transform into xylem and phloem and remain as such.