GED Science TestLife ScienceEasy
A biologist is studying a population of brightly colored frogs in a rainforest. She observes that these frogs secrete a potent toxin from their skin when threatened, deterring predators. This defense mechanism is an example of which of the following evolutionary adaptations?
- ASexual dimorphism
- BCrypsis
- CMimicry
- DAposematism
Show answer & explanationAnswer & explanation
Correct answer: D. Aposematism
Aposematism is a warning signal, often brightly colored, that advertises an organism's unpalatability or dangerousness to potential predators. The toxic secretion combined with bright coloration fits this description perfectly.
Why the other options are wrong
- A. Sexual dimorphism refers to distinct differences in size or appearance between males and females of a species, unrelated to predator deterrence.
- B. Crypsis refers to camouflage, where an organism blends in with its environment to avoid detection, which is the opposite of a bright, warning coloration.
- C. Mimicry involves one species evolving to resemble another, often for protection, which is not the primary mechanism described here.
Aposematism
A defense mechanism where an animal uses warning signals, such as conspicuous coloration, patterns, or sounds, to advertise its unpalatability, toxicity, or dangerousness to potential predators.
- Often involves bright, contrasting colors (e.g., red, yellow, black).
- Teaches predators to avoid similar-looking prey.
- Benefits both predator (avoids harm) and prey (avoids attack).
Memory trick: Warning Colors Ward off Danger.