Why is propagation through grafting not successful in monocots?

Explanation

**Step-by-Step Solution:**

1. **Understanding Grafting**: Grafting is a horticultural technique where tissues from one plant are inserted into those of another so that the two sets of vascular tissues may join together. This process is commonly used for propagating plants.

2. **Vascular Bundles in Monocots**: In monocot plants, the vascular bundles are scattered throughout the stem rather than arranged in a ring. This is a key characteristic that differentiates monocots from dicots.

3. **Presence of Cambium**: In dicots, the vascular bundles contain a layer of cambium, which is responsible for secondary growth. Cambium allows for the formation of new xylem and phloem tissues, enabling the plant to grow thicker over time.

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