The correct answer to the question is option 1, Eucalyptus. The Eucalyptus plant, specifically the species Eucalyptus regnans or Mountain Ash, is known to be the tallest plant in the world. These trees can reach impressive heights of up to 330 feet (100 meters) or more. They are native to Australia and are commonly found in Tasmania and the southeastern parts of the country. The height of Eucalyptus trees allows them to receive more sunlight and access to nutrients, giving them a competitive advantage over other plants. The tall stature of Eucalyptus trees also plays a crucial role in their role within the ecosystem, providing habitat for various animals and contributing to carbon sequestration.