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Question

Polyarch and exarch vascular bundles are the characteristic of

A
Dicot stem
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B
Dicot root
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C
Monocot stem
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D
Monocot root
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Solution

The correct option is C Monocot root
In monocot root, vascular bundles are radial in arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Xylem is described as exarch.
Polyarch - Primary xylem of root with a large number of protoxylem strands. When protoxylem is pointing towards periphery, it is called as exarch xylem and when it is pointing towards the centre, it is called as endarch. So, polyarch and exarch vascular bundles are the characteristic of monocot root and not of dicot stem (endarch), dicot root (exarch) and monocot stem (endrach xylem).
Thus, the correct answer is option D.

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