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Listen to an Academic Talk Test #067
Listen to an Academic Talk
1. What is the main topic of the talk?
A) Adaptations of fish to cold temperatures
B) The chemical composition of the deep sea
C) The production of light by marine organisms
D) Methods for exploring the ocean floor
2. According to the speaker, what is a key component for producing light?
A) The pressure of the deep ocean
B) A specific type of enzyme
C) The absence of sunlight
D) A diet of smaller fish
3. What does the talk imply about the deep-sea environment?
A) It is populated by very few organisms.
B) It lacks natural light from the sun.
C) Its temperature changes dramatically.
D) It is difficult for scientists to study.
4. Why does the speaker mention the anglerfish?
A) To question a common belief about the fish
B) To contrast it with other deep-sea creatures
C) To provide an example of bioluminescence for hunting
D) To describe the most common animal in the ocean
Professor: Today we're heading into the deep ocean to discuss a fascinating phenomenon: bioluminescence. This is the ability of a living organism to produce its own light through a chemical reaction. It's incredibly common in the deep sea, where sunlight cannot penetrate. The reaction typically involves a molecule called luciferin and an enzyme called luciferase. So what's it for? Well, it serves several purposes. The famous anglerfish, for instance, uses a glowing lure to attract unsuspecting prey in the darkness. Other creatures use sudden flashes of light to startle predators, giving them a chance to escape. It's a key survival tool in an environment of total darkness, and it demonstrates how life adapts in creative ways to extreme conditions.
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| ID: | #io6163665671 |
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