Vascular bundles in monocotyledons are considered closed because:

1. a bundle sheath surrounds each bundle
2. cambium is absent
3. there are no vessels with perforations
4. xylem is surrounded all around by phloem

Subtopic:  Vascular Tissue System |
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Closed vascular bundles lack:

1. Ground tissue

2. Conjuctive tissue

3. Cambium

4. Pith

Subtopic:  Vascular Tissue System |
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Some vascular bundles are described as open because these:

1. are not surrounded by pericycle
2. are surrounded by pericycle but no endodermis
3. are capable of producing secondary xylem and phloem
4. possess conjunctive tissue between xylem and phloem
Subtopic:  Vascular Tissue System |
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