Coral Reefs Quiz

Where are coral reefs typically found?

• On coasts and the borders of small islands

• In deep ocean trenches

• In polar regions

• On mountain tops

What is the ideal temperature range for coral reefs to form?

• 0-10 degrees Celsius

• 18-27 degrees Celsius

• 30-40 degrees Celsius

• 10-15 degrees Celsius

What is the maximum depth at which coral reefs can form?

• 100 meters

• 500 meters

• 200 meters

• 60 meters

What type of water is required for coral reefs to thrive?

• Clean, clear, and sediment-free water

• Acidic water with a pH below 7

• Polluted and murky water

• Freshwater from rivers

What are the corals that build reefs called?

• Soft corals

• Sea whips

• Sea fans

• Hard or reef-building corals

What is the role of zooxanthellae in coral reefs?

• They cause coral bleaching

• They provide vibrant colors and help corals survive

• They act as predators of coral polyps

• They dissolve calcium carbonate

What happens during coral bleaching?

• Corals produce more calcium carbonate

• Corals lose their algae and turn white

• Corals grow faster

• Corals migrate to deeper waters

What is the main cause of ocean acidification?

• Deforestation

• Volcanic eruptions

• Overfishing

• Burning of fossil fuels

What percentage of known marine species rely on coral reefs as habitats?

• 50%

• 75%

• 25%

• 10%

Which type of reef is separated from the shore by a lagoon?

• Barrier reef

• Fringing reef

• Atoll

• Patch reef