Question

Any species that have been accidentally or deliberately transferred from their usual habitat to a new habitat whose abiotic conditions are also suitable for them are known as:

• A. Alien or invasive species
• B. Indicator species
• C. Threatened species
• D. Endangered species

Hint:

Remember the progression: A species introduced to a new area is \textbf{alien}. If it establishes a self-sustaining population, it is \textbf{naturalized}. If it then spreads and causes harm, it becomes \textbf{invasive}.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The question asks for the term used to describe species introduced to a new environment outside their native range.

Step 2: Detailed Explanation:
- Alien species (also known as exotic, non-native, or introduced species) are organisms that are moved by human activities, either intentionally or accidentally, to a new area where they are not naturally found.
- If an alien species begins to spread and cause ecological or economic harm, it is then termed an invasive species. The question's description fits the definition of an alien species, which is the precursor to becoming invasive. The combined term "Alien or invasive species" is the most appropriate choice.
- Indicator species are organisms whose presence, absence, or abundance reflects a specific environmental condition.
- Threatened and Endangered species are categories defined by the IUCN Red List based on their risk of extinction.

Step 3: Final Answer:
The definition provided in the question precisely describes an alien species, which can become invasive. Therefore, option (A) is the correct term.