Single Choice

Collateral, open vascular bundle and eustele is present in

ADicot stem
Correct Answer
BMonocot stem
CMonocot root
DDicot Root

Solution

Dicot stem vascular bundles are eight in number, arranged in form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as endarch.
Dicot root vascular bundles are described as radial and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as exarch.
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.
Monocot stem vascular bundles are described as conjoint, collateral and closed.
Eustele is present in most of seed plant stems. Thus, option A is correct.

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