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In a monocot root, the vascular bundles are described as radial and closed. What is the reason for this classification?

1. Monocot vascular bundles are termed closed because they lack cambium tissue.
2. The arrangement of protoxylem helps differentiate an older dicot root from a dicot stem.
3. In dicot roots, the protoxylem is positioned near the edge of the vascular cylinder, while in dicot stems, it is closer to the center, showing an endarch xylem arrangement.
4. Closed vascular bundles are characterized by the absence of cambium between the xylem and phloem.

Correct answer: Monocot vascular bundles are termed closed because they lack cambium tissue.

Solution

Option A is correct because monocot vascular bundles are closed due to the absence of cambium, which prevents secondary growth. The other options describe features of dicot roots and stems, not monocot roots.

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