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- 1. Multiple Choice
What percent of the ocean is taken up by coral reefs?
less than 1%
10-12%
25%
more than 50%
- 2. Multiple Choice
What percentage of the ocean's sea life relies on coral reefs?
10-15%
20%
25%
40%
- 3. Multiple Choice
How many people rely on coral reefs for food, coastal protection, and income?
500,000
5,000,000
500,000,000
50,000
- 4. Multiple Choice
Large coral eefs can be found near (check all that apply)
off the coast of Maine
off the coast of Belize in Central America
in the Caribbean
the Florida Keys
Australia
- 5. Multiple Choice
Coral reefs are created by small animals called coral polyps that are closely related to...
Jellyfish
Sea Stars
Fish
Octopi
- 6. Multiple Choice
Coral polyps are like upsidedown jellyfish.
True
False
- 7. Multiple Choice
Coral polyps make homes for themselves out of a hard stony material called...
calcium carbonate
sodium bicarbonate
carbonic acid
- 8. Multiple Choice
Over the years, coral reefs build up as generations of coral polyps make homes for themselves out of calcium carbonate.
True
False
- 9. Multiple Choice
Coral polyps are hosts to symbiotic algae. The polyps provide shelter and nutrients for the algae, and the algae provide the polyps...
sugar
salt
calcium
ammonia
- 10. Multiple Choice
Coral bleaching happens when coral polyps are stressed by ___ and they kick out their algae (choose all that apply)
An increase in sea temperature
Runoff and pollution
Overexposure to sunlight
Extreme low tides
- 11. Multiple Choice
After a coral bleaching event, the coral will die unless conditions improve and they are recolonized with algae
True
False
- 12. Multiple Choice
Coral may turn brown again after they die. This is due to algae growing on top of the coral's calcium carbonate houses they left behind.
True
False
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