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Vascular bundles in monocotyledons are considered closed because:

1. Cambium is absent
2. There are no vessels with perforations
3. Xylem is surrounded all around by phloem
4. A bundle sheath surrounds each bundle

Correct answer: Cambium is absent

Solution

Monocot vascular bundles are called closed because cambium is absent between xylem and phloem. Without cambium, the bundle cannot produce secondary vascular tissues.

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