Coral reef

What percentage of the ocean is taken up by coral reefs?

• 10-12 percent

• 25 percent

• less than one percent

• more than fifty percent

What are coral reefs often compared to?

• forests

• gardens

• rainforests

• deserts

Coral reefs are endangered by

• climate change

• overfishing

• pollution

• all of the above

What causes coral bleaching?

• oil spills

• warmer water temperatures

• overfishing

• red tide

What is one way scientists trying to save the coral reefs?

• by growing coral and planting it in the ocean

• by restricting access to reefs

• by adding new species of fish to the reefs

• by adding fertilizer to the coral reefs

What is the largest coral reef on the planet?

• Rainbow Reef, Fiji

• Great Chago Archipelago, Indian Ocean

• Amazon Reef, Brazil

• Great Barrier Reef, Australia

Where is the Great Barrier Reef located?

• Philippines

• Australia

• China

• Brazil

What is one big threat to coral reefs?

• sharks

• pollution

• turtles

• anemones

Corals are

• tiny plant organisms that live in clear ocean waters

• colourful calcium carbonate marine rock formations

• small marine animal organisms

• none of the above

What is the relationship between corals and zooxanthellae?

• zooxanthellae grow on the corals and protect them from extreme sunlight

• corals provide food for zooxanthellae when they photosynthesize

• zooxanthellae grow at the expense of the corals

• corals receive their energy from the zooxanthellae