Anatomy and Morphology of Plants
As compared to a dicot root, a monocot root has
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Single Choice
Polyarch and exarch vascular bundles are the characteristic of
ADicot stem
BDicot root
CMonocot stem
DMonocot root
Correct Answer
Solution
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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