Glowing Sea Creatures

How and why do deep-sea animals make their own light?

Check your understanding

1. What is bioluminescence?
- A. A way for ocean animals to store sunlight
- B. The ability of a living creature to make its own light
- C. A type of glowing sticker found in the ocean
- D. The process of reflecting light from the moon
2. What are the two main ingredients needed to create a bioluminescent glow?
- A. Vinegar and baking soda
- B. Water and salt
- C. Luciferin and an enzyme called luciferase
- D. Sunlight and oxygen
3. What is a 'photophore'?
- A. A special organ used to store light-producing ingredients
- B. A type of deep-sea predator
- C. The name of the chemical reaction that creates heat
- D. A tool used by scientists to catch jellyfish
4. Why is most bioluminescence in the ocean blue or green?
- A. Because these colors are the easiest to see above water
- B. Because blue and green light travel the farthest through water
- C. Because blue and green are the only colors animals can eat
- D. Because blue and green paint is common in the deep sea

1. How does an anglerfish use its glowing lure?
- A. To shine a light on its friends
- B. To help it see in the dark while swimming
- C. To attract prey toward its hidden, toothy jaws
- D. To signal that it is not dangerous
2. Why do some squid use 'counter-illumination'?
- A. To communicate with other squid
- B. To blend in with light from above and erase their shadow
- C. To scare away larger predators with bright flashes
- D. To light up the dark ocean floor for hunting
3. Why is the red light of the stoplight loosejaw considered a 'tactical advantage'?
- A. Because it is brighter than all other colors
- B. Because it can be seen from miles away
- C. Because most other deep-sea creatures cannot see red light
- D. Because it scares away sharks
4. How have scientists used the knowledge of bioluminescence to help humans?
- A. By using glowing markers to watch how diseases move through cells
- B. By making glow-in-the-dark medicine for children
- C. By using deep-sea bacteria to power our streetlights
- D. By creating new types of ocean-friendly toothpaste

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