Marine Biology — MCQs

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1. The study of marine organisms and ecosystems is called:





2. The largest marine ecosystem is:





3. The smallest ocean in the world is:





4. The largest ocean in the world is:





5. Coral reefs are primarily formed by:





6. The symbiotic algae living in corals are called:





7. The deepest part of the world’s oceans is:





8. The photic zone of the ocean refers to:





9. Organisms that drift with ocean currents are called:





10. Organisms that actively swim in the ocean are called:





11. Organisms living on or in the ocean floor are called:





12. The process by which deep, nutrient-rich water rises to the surface is:





13. Which ocean current is the strongest in the world?





14. Which gas do phytoplankton produce in large quantities?





15. The primary producers in the ocean are mostly:





16. Bioluminescence in marine organisms is mainly due to:





17. The intertidal zone is the area:





18. Mangroves are typically found in:





19. Which marine mammals are known as “sea cows”?





20. The largest animal on Earth is:





21. The whale shark is a:





22. Which marine reptile can be found in oceans?





23. The largest coral reef system in the world is:





24. Ocean acidification is mainly due to:





25. Hydrothermal vent communities rely on:





26. The study of ocean tides and currents is called:





27. The ocean zone that is permanently dark is:





28. The largest group of marine vertebrates is:





29. Echolocation is used by:





30. Which fish is famous for its electric shock?





31. Which marine organism produces red tides?





32. The salinity of ocean water is mostly due to:





33. Which marine zone contains the continental shelf?





34. The fastest marine animal is:





35. Which marine bird is famous for long-distance migrations?





36. The main nitrogen-fixing organisms in the ocean are:





37. Which ocean current warms Western Europe?





38. Ocean trenches are formed by:





39. The Sargasso Sea is located in:





40. The Portuguese man o’ war is:





41. Which shark species is known for attacking humans most often?





42. The leatherback turtle feeds mainly on:





43. Sea otters help maintain kelp forests by controlling:





44. Which marine mammal can hold its breath the longest?





45. The largest invertebrate in the ocean is:





46. Which ocean zone is richest in biodiversity?





47. Which adaptation helps deep-sea fish survive?





48. The process of water moving in and out due to the moon’s gravity is called:





49. Which ocean is shrinking due to tectonic plate movement?





50. Which marine mammal has the thickest blubber layer?





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