The question asks to identify the specific type of microscopic algae that lives in a symbiotic relationship with coral polyps. This requires knowledge of coral biology and the organisms associated with them.
Correct Option: B) Zooxanthellae — Zooxanthellae are dinoflagellates (a type of microscopic algae) that live symbiotically within the tissues of many marine invertebrates, including coral polyps. They perform photosynthesis, providing the coral with essential nutrients (sugars, amino acids, and oxygen), while the coral provides them with a protected environment and compounds needed for photosynthesis (carbon dioxide and nitrogenous waste). This mutualistic relationship is crucial for the survival and growth of coral reefs.
The question asks to identify the type of ecological relationship between coral polyps and zooxanthellae. This requires understanding the definitions of different symbiotic relationships and applying them to the specific interaction between these two organisms.
C) Mutualism. This is the correct answer because both coral polyps and zooxanthellae benefit from their close association. The zooxanthellae provide food through photosynthesis, and the coral provides a protected habitat and essential nutrients for the algae.
The question asks about the primary source of vibrant colors in coral reefs. To answer this, we need to understand the biology of corals and their symbiotic relationships.
Correct Option: C) Zooxanthellae algae. These symbiotic algae live within coral tissues and contain pigments that give corals their characteristic vibrant colors. They also provide the coral with essential nutrients through photosynthesis.
The question asks why coral reefs are often called the 'rainforests of the sea'. This analogy highlights a key characteristic that coral reefs share with terrestrial rainforests. We need to identify which option best describes this shared characteristic.
Correct Option: B) They have the highest biodiversity in marine ecosystems.
Coral reefs are indeed considered the 'rainforests of the sea' because they harbor an extraordinary diversity of marine life. Despite occupying a tiny fraction of the ocean floor, they are home to an estimated 25% of all marine species, including fish, invertebrates, and algae. This high biodiversity makes them crucial ecosystems for the health of the oceans.
The question asks about the approximate percentage of marine species that rely on coral reefs. This is a factual question related to marine biology and ecology, often covered in environmental science or general knowledge sections of competitive exams. The answer requires knowledge of the biodiversity supported by coral reef ecosystems.
Correct Option: C) 25% — Coral reefs, despite occupying a very small fraction of the ocean floor (less than 0.1%), are critical habitats that support approximately 25% of all marine species. They are biodiversity hotspots, providing essential ecosystem services.
The question asks about the importance of coral reefs to coastal areas. We need to identify the primary ecological and physical function that coral reefs provide for coastlines.
B) Act as natural breakwaters — Coral reefs are massive underwater structures that absorb the energy of incoming waves. By doing so, they reduce wave intensity, protect coastlines from erosion, and safeguard coastal communities and ecosystems from storm surges and tsunamis. This makes them natural breakwaters.