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Questions and Answers
What do coral polyps use to build their skeletons?
What do coral polyps use to build their skeletons?
- Iron extracted from the ocean water
- Calcium carbonate produced from carbon dioxide and calcium from the ocean (correct)
- Sodium chloride obtained from the algae
- Silica extracted from the surrounding water
How do hard coral polyps build an entire reef?
How do hard coral polyps build an entire reef?
- They rely on other marine organisms to build the reef for them
- They secrete a sticky substance to trap sediments and form the reef
- They push away from the surface and fill the gaps with calcium carbonate (correct)
- They release spores that form the structure of the reef
At what rate can corals build up a reef?
At what rate can corals build up a reef?
- Several meters per year
- Several centimeters per year (correct)
- Only a few millimeters per year
- Corals do not actively contribute to reef formation
What can change the shape of coral structures?
What can change the shape of coral structures?
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How can the same coral species look different?
How can the same coral species look different?
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