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One of them is absent in closed vascular bundles.

1. Cambium
2. Pith
3. Ground tissue
4. All of the above

Correct answer: Cambium

Solution

In a closed vascular bundle, cambium is absent because the xylem and phloem are already fully differentiated and there is no meristematic layer between them. Pith and ground tissue may still be present depending on the organ, but cambium is the defining missing part.

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