Tests Your Knowledge Of Coral Reefs

Explanation
Marine ecosystems support approximately 25% of the total fish species found in the ocean. These ecosystems provide a diverse range of habitats and resources that are essential for the survival and reproduction of various fish species. The abundance of food, shelter, and suitable conditions in marine ecosystems allows for the existence of a significant portion of the world's fish population. This high level of support makes marine ecosystems crucial for maintaining the overall health and balance of the ocean's biodiversity.

Explanation
Coral reefs provide multiple benefits, including protecting coastal areas from erosion. Their structure acts as a barrier, reducing the impact of waves and storms on the shore. Additionally, coral reefs have a porous limestone skeleton that can be used as a material for human bone grafts, aiding in medical treatments. Furthermore, certain compounds found in coral reefs have shown potential in the treatment of HIV, cardiovascular diseases, and ulcers. Therefore, all of the mentioned benefits are associated with coral reefs.

Explanation
By the year 2050, it is predicted that 70% of the coral reef ecosystem will be destroyed. This means that a significant portion of the coral reefs around the world will be lost, leading to devastating consequences for marine life and the overall health of the oceans. Coral reefs are important habitats for numerous species, provide protection against coastal erosion, and support local economies through tourism and fisheries. The destruction of 70% of these ecosystems would have a profound impact on biodiversity, food security, and the livelihoods of millions of people who depend on coral reefs.

Explanation
Coral reefs face multiple threats, including global climate change, destructive fishing methods, and pollution. Global climate change leads to rising ocean temperatures and ocean acidification, which can harm coral reefs. Destructive fishing methods, such as dynamite fishing or using cyanide, can directly damage coral reefs and disrupt their ecosystems. Pollution from sources like runoff, sewage, or oil spills can also negatively impact coral reefs by causing water pollution and reducing water quality. Therefore, all of these factors pose significant threats to coral reefs.

Explanation
Coral reefs contribute USD $375 billion to the economy. They provide various ecosystem services such as tourism, fisheries, and coastal protection. Coral reefs attract millions of tourists each year, generating revenue for local economies. They also support fish populations, which are a vital source of food and income for many communities. Additionally, coral reefs act as natural barriers, protecting coastlines from storms and erosion. The economic value of coral reefs is significant, making them crucial for both environmental and economic sustainability.

Explanation
Coral reefs are crucial ecosystems that support the livelihoods and food sources for millions of people worldwide. The answer "500 million" indicates that half a billion people rely on coral reefs for their livelihoods and food. This highlights the significant impact that coral reefs have on the well-being and sustenance of a large portion of the global population.

Explanation
Destructive fishing practices refer to activities that harm marine ecosystems and deplete fish populations. Overfishing involves catching fish at a rate faster than they can reproduce, leading to a decline in their numbers. Blast fishing entails using explosives to stun or kill fish, causing damage to coral reefs and other habitats. Cyanide fishing involves using cyanide to stun fish for easier capture, but it damages coral reefs and can kill other marine organisms. Therefore, all of the options mentioned (overfishing, blast fishing, and cyanide fishing) are considered destructive fishing practices.

Explanation
Coral reefs are made out of coral polyps. Coral polyps are tiny, soft-bodied organisms that secrete a hard calcium carbonate skeleton. They live in large colonies and form the structure of the coral reef. The polyps have a symbiotic relationship with algae called zaoxanthellae, which live within their tissues and provide them with nutrients through photosynthesis. The tentacles of the coral polyps are used for feeding and capturing prey, but they are not the main component of coral reefs.

Explanation
The statement "The coral is dead once the coral bleached" is false. Coral bleaching refers to the process where corals lose their vibrant colors due to the expulsion of symbiotic algae. While coral bleaching can be a sign of stress and can lead to coral death if the stress is prolonged or severe, not all bleached corals are dead. Some corals can recover and regain their color if the stressor is removed or conditions improve. Therefore, coral bleaching does not necessarily mean that the coral is dead.