The correct answer is option 4. This statement is incorrect because more than 100 hotspots of biodiversity have not been identified in the world. The concept of biodiversity hotspots was indeed coined by Norman Myers in 1988, as mentioned in option 2. Biodiversity refers to the variety of plant and animal species present in a particular ecosystem or on Earth as a whole. The term itself was not coined by Walter G. Rosen in 1986, as mentioned in option 1. However, it is important to note that the term `biodiversity hotspots` refers specifically to regions that have exceptionally high levels of biodiversity and are threatened by human activity. These regions are considered to be of great importance for conservation efforts. Therefore, option 3, which states that the regions with the richest biodiversity are called biodiversity hotspots, is correct.