_________________proposed the concept of centres of origin.

Answer

**Step-by-Step Text Solution:**

1. **Identify the Scientist**: The question asks for the name of the scientist who proposed the concept of centers of origin. The correct answer is Nikolai Vavilov.

2. **Understand the Concept**: Vavilov's concept of centers of origin refers to specific geographical areas where domesticated plants and animals originated. He believed that these centers were crucial for understanding biodiversity and the domestication process.

3. **Historical Context**: Vavilov proposed this concept in 1935, during a time when the importance of genetic diversity in agriculture was being recognized. His work laid the foundation for future research in plant breeding and conservation.

4. **List the Centers of Origin**: Vavilov identified eight main centers of origin for domesticated species. These are:
- Mexico and Guatemala
- Peru
- Ecuador and Bolivia
- Mediterranean
- Middle East
- Ethiopia
- Central Asia
- India, Indo-Burma
- China and Korea

5. **Significance of the Concept**: Understanding these centers helps in the conservation of genetic resources and in the improvement of crops and livestock through selective breeding.