Marine ecosystems and their biodiversity MCQs

By: Prof. Dr. Fazal Rehman | Last updated: June 11, 2025

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1. : Which of the following is the primary producer in marine ecosystems?



2. : Coral reefs are often referred to as the “rainforests of the sea” due to their:



3. : Which marine zone is characterized by the presence of deep-sea organisms and high pressure?



4. : What role do mangroves play in marine ecosystems?



5. : Which of the following is a major threat to marine biodiversity?



6. : Which marine organism is known for its role in the formation of coral reefs?



7. : The term “bycatch” refers to:



8. : Which of the following is NOT a function of marine ecosystems?



9. : What is the primary source of energy for hydrothermal vent ecosystems?



10. : Which marine habitat is characterized by low light levels and high pressure?



11. : Which of the following is an example of a keystone species in marine ecosystems?



12. : The “dead zone” in marine environments is caused by:



13. : What is the main cause of ocean acidification?



14. : Which marine species is known for its role in maintaining the health of seagrass beds?



15. : Which of the following is NOT a characteristic of the intertidal zone?



16. : The “Great Pacific Garbage Patch” is primarily composed of:



17. : What is the role of phytoplankton in marine ecosystems?



18. : Which of the following species is a primary consumer in a marine food web?



19. : Which factor is most likely to influence the distribution of marine species?



20. : Which marine ecosystem is known for its high productivity and support of diverse species?



21. : In marine environments, the term “benthic” refers to:



22. : What is the primary impact of climate change on marine ecosystems?



23. : The “photic zone” in marine ecosystems is characterized by:



24. : Which of the following is an example of a top predator in marine ecosystems?



25. : What is the primary threat to seagrass meadows?



26. : Which marine zone is known for having the highest species diversity?



27. : Which factor contributes to the formation of coral reefs?



28. : Which marine habitat is crucial for the early life stages of many fish species?



29. : The term “marine snow” refers to:



30. : Which of the following is a primary factor influencing coral bleaching events?



31. : Who was the first Prime Minister of Pakistan?



32. : When did Liaquat Ali Khan’s tenure as Prime Minister of Pakistan end?



 

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