Biology Regents Practice Exam

Which scenario is an example of an organism affected by a biotic factor?

1. A squirrel cannot find a mate

2. A flood washes away a maple tree

3. A plant is in a dark room

4. A chipmunk finds a rock pile to use for a home

The correct answer is: A squirrel cannot find a mate

The scenario where a squirrel cannot find a mate is an example of an organism affected by a biotic factor because it involves interactions with other living organisms. In this case, the inability of the squirrel to find a mate directly influences its reproduction and survival, reflecting the impact of population dynamics within its species. Biotic factors include all living components of an ecosystem, such as competition, predation, disease, and mating opportunities. The absence of potential mates represents a competition for reproductive partners, which is a crucial aspect of the life cycle of organisms. This situation highlights the significance of social and reproductive interactions among individuals of the same species in determining population health and stability. In contrast, the other scenarios reflect abiotic factors or external conditions. The flooding of a maple tree and a plant being in a dark room relate to environmental conditions, while the chipmunk finding a rock pile touches on habitat choice but does not illustrate an impact from living organisms. Therefore, the scenario involving the squirrel clearly showcases the influence of a biotic factor.