Listen to an Academic Talk

Listen to an Academic Talk

Listen to part of a talk in a class. Then answer the questions. You will hear the talk only once.

1. What is the talk mainly about?

• A. How animals produce toxins to defend themselves
• B. Two ways species benefit from looking like other species
• C. Why birds prefer to eat certain kinds of butterflies
• D. How snakes developed their bright warning colors

2. According to the professor, what can happen if Batesian mimics become too common?

• A. The mimics begin producing their own toxins.
• B. The harmful species changes its color pattern.
• C. Predators stop hunting both the mimics and the models.
• D. Predators stop treating the warning pattern as a danger signal.

3. Why does the professor discuss the viceroy butterfly?

• A. To show that an accepted example was changed after testing
• B. To give a clear example of a harmless Batesian mimic
• C. To explain how monarch butterflies became toxic
• D. To compare butterflies with the kingsnake and coral snake

4. What can be inferred about Mullerian mimicry?

• A. It works only when one species is much rarer than the other.
• B. It was discovered before Batesian mimicry.
• C. It benefits every species that shares the pattern.
• D. It mainly occurs among harmless species.