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Coral Bleaching: Causes and Implications

Description: Coral Bleaching: Causes and Implications
Number of Questions: 15
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Tags: environment global warming coral bleaching
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What is coral bleaching?

  1. When corals lose their symbiotic algae

  2. When corals turn white

  3. When corals die

  4. When corals reproduce


Correct Option: A
Explanation:

Coral bleaching occurs when corals lose their symbiotic algae, called zooxanthellae, which provide them with food and color.

What are the main causes of coral bleaching?

  1. Rising sea temperatures

  2. Ocean acidification

  3. Pollution

  4. Overfishing


Correct Option: A
Explanation:

Rising sea temperatures, caused by climate change, are the primary cause of coral bleaching. Other stressors, such as ocean acidification, pollution, and overfishing, can also contribute to bleaching.

How does coral bleaching affect coral reefs?

  1. It makes them more resilient to climate change

  2. It makes them more susceptible to disease

  3. It helps them grow faster

  4. It has no effect on them


Correct Option: B
Explanation:

Coral bleaching makes corals more susceptible to disease and death. Bleached corals are also more likely to experience stunted growth and reduced reproduction.

What are the implications of coral bleaching for marine ecosystems?

  1. It leads to a decline in biodiversity

  2. It disrupts the food chain

  3. It affects coastal protection

  4. All of the above


Correct Option: D
Explanation:

Coral bleaching can lead to a decline in biodiversity, disruption of the food chain, and reduced coastal protection. Coral reefs provide habitat for a wide variety of marine life, and their loss can have a ripple effect on the entire ecosystem.

What can be done to prevent coral bleaching?

  1. Reduce greenhouse gas emissions

  2. Protect marine ecosystems

  3. Educate the public about coral reefs

  4. All of the above


Correct Option: D
Explanation:

To prevent coral bleaching, we need to reduce greenhouse gas emissions, protect marine ecosystems, and educate the public about the importance of coral reefs. All of these actions are necessary to address the root causes of coral bleaching and ensure the long-term health of coral reefs.

What is the role of symbiotic algae in coral reefs?

  1. They provide food for corals

  2. They help corals build their skeletons

  3. They give corals their color

  4. All of the above


Correct Option: D
Explanation:

Symbiotic algae, called zooxanthellae, play a crucial role in coral reefs. They provide food for corals through photosynthesis, help corals build their skeletons by removing carbon dioxide from the water, and give corals their vibrant colors.

What is the difference between coral bleaching and coral death?

  1. Coral bleaching is temporary, while coral death is permanent

  2. Coral bleaching is caused by rising sea temperatures, while coral death can be caused by a variety of factors

  3. Coral bleaching can lead to coral death, but not all bleached corals die

  4. All of the above


Correct Option: D
Explanation:

Coral bleaching is a temporary phenomenon where corals lose their symbiotic algae, while coral death is permanent. Coral bleaching can be caused by rising sea temperatures, while coral death can be caused by a variety of factors, including disease, pollution, and overfishing. Coral bleaching can lead to coral death, but not all bleached corals die.

What is the Great Barrier Reef?

  1. The largest coral reef system in the world

  2. A UNESCO World Heritage Site

  3. Located off the coast of Australia

  4. All of the above


Correct Option: D
Explanation:

The Great Barrier Reef is the largest coral reef system in the world, stretching for over 2,300 kilometers along the coast of Australia. It is a UNESCO World Heritage Site and is home to an incredible diversity of marine life.

What percentage of the world's coral reefs have been lost or damaged?

  1. 20%

  2. 50%

  3. 75%

  4. 90%


Correct Option: B
Explanation:

Approximately 50% of the world's coral reefs have been lost or damaged due to human activities, including climate change, pollution, and overfishing.

What is the role of coral reefs in the global carbon cycle?

  1. They absorb carbon dioxide from the atmosphere

  2. They release carbon dioxide into the atmosphere

  3. They have no role in the carbon cycle

  4. They both absorb and release carbon dioxide


Correct Option: D
Explanation:

Coral reefs play a role in the global carbon cycle by both absorbing and releasing carbon dioxide. They absorb carbon dioxide through photosynthesis and release it through respiration and the decomposition of organic matter.

What is the economic value of coral reefs?

  1. Billions of dollars per year

  2. Trillions of dollars per year

  3. Quadrillions of dollars per year

  4. None of the above


Correct Option: B
Explanation:

Coral reefs provide a range of economic benefits, including tourism, fisheries, and coastal protection. The estimated economic value of coral reefs is in the trillions of dollars per year.

What is the future of coral reefs under climate change?

  1. They will continue to thrive

  2. They will all die

  3. They will adapt to changing conditions

  4. They will experience mass bleaching events


Correct Option: D
Explanation:

Under climate change, coral reefs are projected to experience mass bleaching events more frequently and severely. Rising sea temperatures and ocean acidification are major threats to the survival of coral reefs.

What can individuals do to help protect coral reefs?

  1. Reduce their carbon footprint

  2. Avoid using sunscreen that contains oxybenzone and octinoxate

  3. Support organizations that work to protect coral reefs

  4. All of the above


Correct Option: D
Explanation:

Individuals can help protect coral reefs by reducing their carbon footprint, avoiding using sunscreen that contains oxybenzone and octinoxate, and supporting organizations that work to protect coral reefs.

What is the role of governments in protecting coral reefs?

  1. Implement policies to reduce greenhouse gas emissions

  2. Create marine protected areas

  3. Regulate coastal development

  4. All of the above


Correct Option: D
Explanation:

Governments can help protect coral reefs by implementing policies to reduce greenhouse gas emissions, creating marine protected areas, regulating coastal development, and supporting research and conservation efforts.

What is the role of international cooperation in protecting coral reefs?

  1. Sharing scientific knowledge and research

  2. Coordinating conservation efforts

  3. Providing financial assistance to developing countries

  4. All of the above


Correct Option: D
Explanation:

International cooperation is essential for protecting coral reefs. Countries can work together to share scientific knowledge and research, coordinate conservation efforts, and provide financial assistance to developing countries to help them protect their coral reefs.

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