Oceanography and Marine Biology MCQs

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1. : What percentage of Earth’s surface is covered by oceans?



2. : Which ocean is the largest by area?



3. : What is the study of the physical and biological aspects of the ocean called?



4. : Which marine zone is closest to the shore and is affected by tides?



5. : What type of organism forms the base of most ocean food chains?



6. : What is the name of the largest coral reef system in the world?



7. : Which oceanic feature is a deep valley on the ocean floor?



8. : What is the primary cause of ocean tides?



9. : What is the term for the warm, nutrient-poor surface layer of the ocean?



10. : Which gas is most abundant in seawater?



11. : What marine animals build calcium carbonate shells?



12. : What process do marine plants use to convert sunlight into energy?



13. : Which ocean zone is known as the “midnight zone” where no sunlight penetrates?



14. : Hydrothermal vents are primarily found at which oceanic feature?



15. : Which is the largest marine mammal?



16. : What is the function of bioluminescence in marine animals?



17. : What type of plankton are small drifting animals in the ocean?



18. : Which of the following is a key nutrient for marine plant growth?



19. : The process where seawater becomes denser due to cooling or increased salinity is called:



20. : Which part of a sea turtle’s body helps it to swim efficiently?



21. : What is the name of the floating community of organisms at the ocean’s surface?



22. : Which ocean layer contains the highest pressure?



23. : What is the term for animals that live on or in the seabed?



24. : What is the main cause of ocean currents?



25. : Which of these is a filter-feeding marine animal?



26. : Which marine plant is known as “sea grass”?



27. : What is the main component of coral reefs?



28. : The deepest part of the ocean is known as the:



29. : Which gas dissolves in seawater to create carbonic acid?



30. : What is a major threat to coral reefs worldwide?



31. : Which fish is known for its ability to generate electric shocks?



32. : Which type of symmetry do most adult echinoderms exhibit?



33. : Mangrove forests are important because they:



34. : What causes ocean acidification?



35. : What kind of feeders are baleen whales?



36. : Which of the following is a pelagic fish?



37. : The process by which nutrients from deep water rise to the surface is called:



38. : Which ocean zone supports the greatest biodiversity?



39. : What kind of organism is a krill?



40. : What is a characteristic of plankton?



41. : Which part of the ocean floor is relatively flat and extends from the shore?



42. : What type of reproduction is common in marine corals?



43. : What is the main source of energy for hydrothermal vent communities?



44. : Which marine animal has tentacles with stinging cells called nematocysts?



45. : What is the salinity of average seawater?



46. : What is the name for the large circular current systems in the oceans?



47. : Which of these animals is a nekton?



48. : The ocean’s biological pump helps in:



49. : Which layer of the ocean has the steepest temperature gradient?



50. : What is the main purpose of mangrove roots?



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