Home
Listening
Listen to an Academic Talk Test #061
Listen to an Academic Talk
1. What is the talk mainly about?
A) The chemistry of light production
B) Predator-prey relationships in the ocean
C) An adaptation of deep-sea animals
D) Methods for studying marine life
2. According to the professor, what is one function of bioluminescence?
A) To generate heat
B) To communicate with other species
C) To help with navigation
D) To attract food
3. What can be inferred about the deep-sea environment?
A) It has a very limited food supply
B) It is completely devoid of sunlight
C) It is warmer than surface waters
D) Few species have managed to adapt to it
4. Why does the professor mention the anglerfish?
A) To give an example of a specific use for bioluminescence
B) To describe the most common animal in the deep sea
C) To explain why some fish are more evolved than others
D) To introduce the topic of deep-sea fishing
Professor: Today we're going to discuss a fascinating phenomenon of the deep sea: bioluminescence. This is the production and emission of light by a living organism. It's incredibly common in the deep ocean, where sunlight doesn't penetrate. In fact, scientists estimate over 75 percent of deep-sea creatures have this ability. So, why do they do it? Well, it serves several purposes. Some animals, like the famous anglerfish, use a bioluminescent lure to attract prey in the darkness. Others use sudden flashes of light to startle predators, giving them a chance to escape. It's a critical survival tool in an environment of total darkness. The chemical reactions that create this "living light" are highly efficient, producing almost no heat, which is quite remarkable. We're still learning a lot about how it evolved.
Highlights
| ID: | #io4732331616 |
Tags
New TOEFL