Coral Reefs: Ecosystems of Diversity and Survival

The video explores the vastness of the ocean, covering over 70% of Earth's surface, and its diverse ecosystems. It focuses on tropical coral reefs, highlighting their structure, biodiversity, and ecological importance. Coral reefs, though covering less than 0.1% of the ocean, host over 25% of marine life. The video discusses the threats to coral reefs, such as climate change and human activities, and emphasizes the need for conservation efforts to protect these vital ecosystems.

What percentage of the Earth's surface is covered by the ocean?

• 70%

• 80%

• 60%

• 50%

What are the main components of tropical coral reefs?

• Marine vertebrates

• Marine invertebrates

• Marine birds

• Marine mammals

How do soft corals obtain their energy?

• Predation

• Filter feeding

• Symbiosis

• Photosynthesis

What is the primary material hard corals use to build their exoskeletons?

• Calcium carbonate

• Silica

• Magnesium

• Phosphate

What percentage of marine organisms are found in coral reefs?

• 25%

• 15%

• 10%

• 35%

Which of the following is NOT typically found in coral reef ecosystems?

• Sea snakes

• Polar bears

• Sea turtles

• Seahorses

At what rate do most coral reefs grow annually?

• Less than 1cm

• 1-2cm

• 2-3cm

• 3-4cm

What is a major human-induced factor contributing to coral reef decline?

• Overfishing

• Climate change

• Deforestation

• Urbanization

What practice is essential to ensure the survival of coral reefs?

• Increasing tourism

• Building more coastal cities

• Reducing carbon emissions

• Increasing fishing

What is a significant consequence of runoff from farming on coral reefs?

• Increased acidity

• Decreased water temperature

• Decreased nutrient levels

• Increased biodiversity