How is polyploid breeding useful in crop improvement?

Explanation

**Step-by-Step Solution:**

1. **Understanding Polyploidy:**
- Polyploidy refers to the condition of having more than two complete sets of chromosomes in an organism. In contrast, organisms with one set of chromosomes are termed haploid, and those with two sets are diploid.

2. **Natural Occurrence of Polyploidy:**
- Many important crops such as wheat, rice, sugarcane, and cotton are naturally polyploid. This means they have evolved to have multiple sets of chromosomes, which can contribute to their robustness and adaptability.

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