Classify vascular bundles on the basis of postion of protoxylum.

Explanation

To classify vascular bundles based on the position of protoxylem, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are arrangements of xylem and phloem in plants. The xylem is responsible for water transport, while phloem transports nutrients.

2. **Identifying Protoxylem**: Protoxylem is the first-formed xylem in a plant's development. Its position relative to the metaxylem (the later-formed xylem) is crucial for classification.

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