Coral Reefs and Their Ecosystem

The video explores the beauty and complexity of coral reefs, highlighting their symbiotic relationship with algae. It explains how rising water temperatures lead to coral bleaching, where algae leave the coral, causing a loss of color and nutrition. The video emphasizes the importance of coral reefs, which support a quarter of marine life, and discusses the threats they face due to climate change. It concludes with the need for restoration efforts to help reefs adapt to changing conditions.

What gives corals their beautiful colors?

• The minerals in the water

• The algae living inside them

• The depth of the water

• The type of rock they attach to

What is the name of the algae that live inside corals?

• Phytoplankton

• Seaweed

• Zooxanthellae

• Kelp

How do algae benefit from their relationship with corals?

• They get nutrients from the corals

• They get more sunlight

• They get a safe place to live

• They get protection from predators

What happens to corals when water temperatures increase significantly?

• They expel the algae

• They change color

• They grow faster

• They become more resilient

What is coral bleaching?

• When corals move to deeper waters

• When corals reproduce

• When corals grow larger

• When corals turn white due to loss of algae

Can bleached corals recover?

• No, they are permanently damaged

• Only if new algae are introduced

• Only if they are moved to a different location

• Yes, if water temperatures return to normal

What percentage of the Earth's surface do reefs occupy?

• 1%

• 10%

• 5%

• 15%

What fraction of marine life do coral reefs support?

• One half

• One quarter

• One third

• One fifth

Why is it important to restore reefs with more resilient corals?

• To attract more tourists

• To make them more colorful

• To help them adapt to changing conditions

• To increase their size

What is at stake if coral reefs are not protected?

• Loss of marine biodiversity

• More frequent algae blooms

• Decrease in ocean temperatures

• Increase in coral growth