Coral Reefs: Growth and Threats

The video explores the Great Barrier Reef in Indonesia, highlighting its status as the third longest reef in the world. It discusses the formation of coral reefs over millions of years and their incredible biodiversity. The video explains the importance of visual communication among reef fish and the dynamic stability of reef ecosystems. It also addresses the threats posed by global warming, leading to coral bleaching, and emphasizes the need for conservation efforts.

Where is the third longest barrier reef in the world located?

• Australia

• Cuba

• Indonesian archipelago

• Hawaii

What is the primary composition of the skeletons that form coral reefs?

• Calcium carbonate

• Silicon dioxide

• Magnesium sulfate

• Sodium chloride

Why is visual communication important in coral reefs?

• To attract mates

• To find food

• To send signals of warning, confusion, or hiding

• To navigate the reef

How many species of fish are found in coral reefs?

• 1500

• 2000

• 1000

• 500

What makes the coral reef ecosystem dynamic?

• Lack of species diversity

• Constant species extinction

• Static populations

• Varying species populations but stable community

What is the main threat to coral reefs due to global warming?

• Increased fish population

• Increased algae growth

• Coral bleaching

• Decreased water salinity

What is the process called when corals lose their symbiotic zooxanthellae?

• Coral fragmentation

• Coral bleaching

• Coral erosion

• Coral expansion

What is the optimal temperature range for coral growth?

• 24-25 degrees Celsius

• 26-27 degrees Celsius

• 22-23 degrees Celsius

• 20-21 degrees Celsius

What happens to corals when the water temperature exceeds the optimal range?

• They grow faster

• They attract more fish

• They become more colorful

• They suffer stress and bleach

What is the main cause of coral bleaching?

• Increased water pollution

• Decreased sunlight

• Unusually warm waters

• Increased salinity