Texas Pesticide Applicator Practice Exam

Which of the following defines an endangered species?

1. A plant or animal at risk of extinction throughout a significant portion of its range

2. A species that has recently become abundant in population

3. A plant that can adapt to urban environments

4. Any species listed in state laws

The correct answer is: A plant or animal at risk of extinction throughout a significant portion of its range

An endangered species is specifically defined as a plant or animal that is at risk of extinction throughout a significant portion of its range. This definition reflects both the species' risk of disappearing and its geographical scope. Factors contributing to the endangered status may include habitat loss, environmental changes, disease, and competition with non-native species. Recognizing a species as endangered enables the implementation of conservation efforts aimed at protecting and preserving its population and habitat. The other options do not align with the standard definition of an endangered species. A species that has recently become abundant in population is not considered endangered; rather, it may represent a success in conservation or population recovery. A plant that can adapt to urban environments does not inherently indicate a risk of extinction; in fact, such adaptability may suggest resilience. Lastly, while species listed in state laws may include endangered species, not all species in those laws are endangered, as definitions and protections can vary. Thus, the correct answer focuses explicitly on the criteria of risk of extinction and its geographical significance.