Marine Biology Of animal MCQs January 8, 2026March 13, 2024 by u930973931_answers 21 min Score: 0 Attempted: 0/21 Subscribe 1. . Marine biology is the scientific study of: (A) Terrestrial animals (B) Freshwater animals (C) Marine organisms (D) Avian organisms 2. . Which of the following is not a characteristic of marine organisms? (A) Adaptation to high salinity (B) Ability to breathe underwater (C) Dependence on sunlight for photosynthesis (D) Adaptation to low oxygen levels 3. . What is the term for the zone of the ocean where sunlight penetrates and photosynthesis can occur? (A) Abyssal zone (B) Twilight zone (C) Photic zone (D) Aphotic zone 4. . Which of the following is not a major division of marine habitats? (A) Intertidal zone (B) Pelagic zone (C) Benthic zone (D) Terrestrial zone 5. . What is the scientific study of marine ecosystems called? (A) Marine ecology (B) Marine geology (C) Marine chemistry (D) Marine physics 6. . Which of the following is not a type of marine organism? (A) Cnidarians (B) Mollusks (C) Echinoderms (D) Arthropods 7. . What is the primary source of energy for most marine ecosystems? (A) Sunlight (B) Thermal vents (C) Chemical energy (D) Hydrothermal energy 8. . Which of the following is not a type of marine biome? (A) Coral reefs (B) Kelp forests (C) Savannas (D) Deep-sea vents 9. . What is the term for the process by which marine organisms convert sunlight into chemical energy? (A) Photosynthesis (B) Chemosynthesis (C) Autotrophy (D) Heterotrophy 10. . Which of the following is not a characteristic of marine algae? (A) Photosynthesis (B) Cellulose cell walls (C) Chlorophyll pigments (D) Heterotrophic nutrition 11. . What is the primary role of phytoplankton in marine ecosystems? (A) Predation (B) Herbivory (C) Decomposition (D) Parasitism 12. . Which of the following is not a major group of marine invertebrates? (A) Mollusks (B) Arthropods (C) Chordates (D) Cnidarians 13. . What is the term for the process by which marine organisms take in dissolved oxygen from water? (A) Respiration (B) Osmoregulation (C) Osmosis (D) Diffusion 14. . Which of the following is not a function of marine ecosystems? (A) Carbon sequestration (B) Oxygen production (C) Nitrogen fixation (D) Ozone depletion 15. . What is the term for the area where freshwater meets saltwater in the ocean? (A) Halocline (B) Thermocline (C) Pycnocline (D) Estuary 16. . Which of the following is not a characteristic of marine mammals? (A) Warm-bloodedness (B) Ability to breathe underwater (C) Live birth (D) Scales 17. . What is the term for the study of marine animal behavior? (A) Ethology (B) Marine physiology (C) Marine ecology (D) Marine zoology 18. . Which of the following is not a major group of marine vertebrates? (A) Fish (B) Reptiles (C) Mammals (D) Mollusks 19. . What is the primary role of zooplankton in marine ecosystems? (A) Predation (B) Herbivory (C) Decomposition (D) Parasitism 20. . Which of the following is not a major type of marine pollution? (A) Oil spills (B) Plastic pollution (C) Noise pollution (D) Soil erosion 21. . What is the term for the process by which marine organisms excrete waste into the water? (A) Excretion (B) Osmoregulation (C) Diffusion (D) Filtration