Coral Reef Quiz 3

What is the minimum average water temperature required for reef-building corals to grow and reproduce?

• 10 degrees C

• 20 degrees C

• 30 degrees C

• 40 degrees C

What is the first sign of heat stress or other kinds of stress in corals?

• They change color

• They expel their zooxanthellae

• They grow faster

• They move to cooler waters

What is the upper limit of water temperature that is usually tolerable for corals?

• 20-25 degrees C

• 25-30 degrees C

• 30-35 degrees C

• 35-40 degrees C

Which factors are most corals sensitive to?

• High salinity, sand, and pollution

• Reduced salinity, silt, and pollution

• Increased salinity, gravel, and clean water

• Reduced salinity, sand, and clean water