100+ Free the Ocean Trivia Questions & Answers

Question: What is the largest marine animal?

Answer: Blue Whale

Question: What species of tuna is highly prized?

Answer: Albacore

Question: What is the world's oceans largest living reptile?

Answer: Estuarine Crocodile

Question: Which fish is known for its vibrant orange and white stripes?

Answer: Clownfish

Question: What is a common food source for many marine animals?

Answer: Plankton

Question: What is the name of a daily trivia question related to marine life?

Answer: Today’s trivia removing plastic

Question: What is a major issue affecting the ocean and marine life?

Answer: Plastic pollution

Question: Which marine mammal is known for its vocal and social behavior?

Answer: Dolphin

Question: What is the main function of gills in fish?

Answer: Breathing

Question: Which marine organism is known for its ability to camouflage by changing color?

Answer: Octopus

Question: What marine animal is affected by single-use plastics in the ocean?

Answer: Sea Turtle

Question: What type of whale is the Blue Whale?

Answer: A baleen whale species

Question: What fish can inflate itself as a defense mechanism?

Answer: Pufferfish

Question: Which marine creature is a major contributor to oceanic oxygen production?

Answer: Phytoplankton

Question: What type of fish has both eyes located on one side?

Answer: Flounder

Question: What is the world’s largest flatfish?

Answer: Halibut

Question: What is the most intelligent invertebrate found in the sea?

Answer: Octopus

Question: What marine mammal is known for its tusks and whiskers?

Answer: Walrus

Question: What marine organism plays a big role in the removal of plastics from the ocean?

Answer: Parley Global Cleanup Network

Question: Which marine mammal has long, wide pectoral fins?

Answer: Humpback Whale

Question: What creature is known as a “sea cow”?

Answer: Manatee

Question: What is the common feature of echinoderms like starfish?

Answer: Radial symmetry

Question: What fish species is known for its elongated body and large head?

Answer: Hake

Question: What is the primary function of plankton in the world’s oceans?

Answer: Primary producers

Question: Which marine animal is affected by plastic waste in the ocean?

Answer: Sea Turtle

Question: What type of marine invertebrate feeds by straining seawater with its feathery tentacles?

Answer: Fan Worm

Question: What tiny crustacean is an important food source for marine animals?

Answer: Krill

Question: What marine mollusk has a distinctive spiral shell?

Answer: Conch

Question: Which marine organism produces oxygen and sequesters carbon?

Answer: Phytoplankton

Question: What type of marine life forms the general foundation of the ocean food chain?

Answer: Plankton

Question: Which marine organism contributes significantly to the recycling of nutrients on the ocean floor?

Answer: Microorganisms

Question: What ancient marine microorganisms make up about 70% of marine biomass?

Answer: Microbes

Question: What is the primary role of viruses in marine ecosystems?

Answer: Regulating saltwater ecosystems

Question: Which deep-sea fish has long, sharp teeth and an illuminated bell-shaped lure?

Answer: Viper Fish

Question: What is the common name for the tiny, two-shelled crustacean called an ostracod?

Answer: Seed Shrimp

Question: What marine organism has a transient anus that forms only when it needs to defecate?

Answer: Sea Walnut

Question: What is the primary role of bacteria in the marine carbon cycle?

Answer: Recycling carbon on the ocean floor

Question: What is the world’s largest known bacterium?

Answer: Thiomargarita namibiensis

Question: Which marine invertebrate is known for having a protective cover of bacteria?

Answer: Pompeii Worm

Question: What marine archaea is known for producing methane?

Answer: Methanosarcina barkeri

Question: What organism makes up the largest portion of the marine biomass?

Answer: Microorganisms

Question: Which marine bacteria is the most abundant in the ocean?

Answer: Pelagibacter ubique

Question: What is a common shape for many archaea?

Answer: Flat and square-shaped

Question: Which ancient marine microorganism is known for being an extremophile?

Answer: Thermophiles

Question: What is a major challenge faced by sea life on the ocean floor?

Answer: Plastic pollution and plastic waste

Question: What type of bony fish is known for its ability to survive on the sea floor?

Answer: Flounder

Question: What marine invertebrate is affected by plastic pollution?

Answer: Coral polyps

Question: Which sea creature is a venomous marine reptile?

Answer: Sea Snakes

Question: What is the estimated number of marine species documented as of 2023?

Answer: More than 242,000

Question: Which marine microorganism is essential for nutrient cycling in the ocean?

Answer: Microbes

Question: What event is thought to have triggered the Cambrian explosion?

Answer: Accumulation of oxygen in the atmosphere

Question: Which marine animal is closely related to dolphins but with a different-shaped nose and teeth?

Answer: Porpoise

Question: What is the earliest animal genus found in the fossil record?

Answer: Dickinsonia

Question: Which marine mammal is known for its long tusks and whiskers?

Answer: Walrus

Question: Which group of marine animals returned to the ocean after evolving on land?

Answer: Sea snakes, sea turtles, seals, manatees, and whales

Question: What is the term for the common ancestor from which all life on Earth descended?

Answer: LUCA (Last Universal Common Ancestor)

Question: What is the estimated age of the Earth?

Answer: 4.54 billion years

Question: What type of marine animal is known for having a distinctive quilted appearance in fossils?

Answer: Ediacara biota

Question: What early marine organism is thought to be an ancestor of mollusks?

Answer: Kimberella

Question: What whale species is the Blue Whale part of?

Answer: Baleen whales

Question: What marine vertebrate is known for having a large brain and complex social behaviors?

Answer: Dolphin

Question: What is the estimated number of marine species documented as of 2023?

Answer: More than 242,000

Question: Which marine invertebrate is considered the most basal animal?

Answer: Sponges

Question: What is the primary characteristic that distinguishes animals from plants?

Answer: Lack of cell walls

Question: What marine organism is known for its biradial symmetry?

Answer: Ctenophores

Question: What group of marine invertebrates is known for their hard exoskeleton?

Answer: Arthropods

Question: What marine animal evolved from single-celled eukaryotes?

Answer: Protists

Question: What is the earliest evidence of life on Earth found in Western Australia?

Answer: Microbial mat fossils

Question: What marine organism is thought to have a cooperative association with algae to form chloroplasts?

Answer: Cyanobacteria

Question: Which marine animal is most likely to ingest single-use plastics in the ocean?

Answer: Sea Turtle

Question: What is the primary purpose of the Parley Global Cleanup Network?

Answer: Plastic removal from the world’s oceans

Question: Which marine invertebrate is known for having a ribbed oval shape?

Answer: Dickinsonia

Question: What marine invertebrate is most at risk from the plastic problem?

Answer: Coral

Question: What marine organism is known to be affected by plastic pollution?

Answer: Fish

Question: Which organization founded by Mimi Ausland focuses on plastic waste removal from the ocean?

Answer: freetheocean.com

Question: What percentage of the Earth's surface is covered by oceans?

Answer: 71 percent

Question: What is the deepest underwater location on Earth?

Answer: Challenger Deep

Question: What is the average salinity of Earth’s oceans?

Answer: 35 grams of salt per kilogram of seawater

Question: What is the primary source of salts in the ocean?

Answer: Weathering and erosion of rocks on land

Question: What is the term for the process where carbon is sequestered in the deep ocean?

Answer: Biological pump

Question: Which planet's moon is thought to have a saltwater ocean beneath its ice surface?

Answer: Europa (Jupiter's moon)

Question: What is the estimated volume of Earth's world ocean?

Answer: 1.332 billion cubic kilometers

Question: Which ocean phenomenon causes significant weather shifts like the El Niño-Southern Oscillation?

Answer: Oceanic temperature distribution shifts

Question: What percentage of Earth's water is saline?

Answer: 97.5 percent

Question: Which type of water contains 69% of Earth's fresh water?

Answer: Ice in ice caps and glaciers

Question: What marine organism is responsible for protecting shorelines by creating new land?

Answer: Coral

Question: What type of ecosystem is primarily formed by marine organisms like coral?

Answer: Reefs

Question: What process involves the cycling of carbon, nitrogen, and other nutrients by marine microorganisms?

Answer: Nutrient recycling

Question: Which marine environment is known for having the largest reservoir of dissolved atmospheric gases?

Answer: The oceans

Question: What is the main role of seawater in the world's climate?

Answer: Acting as a large heat reservoir

Question: What marine process involves the downward flow of organic material to the deep ocean?

Answer: Biological pump

Question: Which moon of Saturn is believed to have an underground ocean supporting life?

Answer: Enceladus

Question: What is the name of the cycle that describes the continuous movement of water on Earth?

Answer: Water cycle

Question: What is the common term for the interconnected ocean system on Earth?

Answer: World ocean

Question: What is the main influence of ocean currents on global weather patterns?

Answer: Regulating temperature distribution

Question: What percentage of the ocean’s volume is made up of living space on Earth?

Answer: 90 percent

Question: What is a major environmental issue impacting marine life and ecosystems?

Answer: Single-use plastics

Question: What type of products can help reduce the impact of plastic waste on the ocean?

Answer: Plastic-free products

Question: Which country is known for its efforts in plastic waste removal, especially along its coastlines?

Answer: United States

Question: What organization works with a global community to combat plastic pollution in the oceans?

Answer: Sustainable Coastlines Hawaii