Marine Biology MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Marine Biology MCQs for Preparation.
The student can clear their concepts for Marine Biology online quiz by attempting it. Doing MCQs based Marine Biology will help you to check your understanding and identify areas of improvement.
Marine Biology Online MCQs with Answers
Which of the following is not a major marine biome?
a) Coral reefs
b) Tundra
c) Estuaries
d) Open ocean
What is the largest ocean in the world?
a) Atlantic Ocean
b) Indian Ocean
c) Pacific Ocean
d) Southern Ocean
Which of the following is an example of a benthic organism?
a) Shark
b) Sea turtle
c) Coral
d) Dolphin
What is the process by which marine organisms convert sunlight into chemical energy?
a) Photosynthesis
b) Respiration
c) Decomposition
d) Bioluminescence
Which of the following is not a type of marine mammal?
a) Whale
b) Dolphin
c) Octopus
d) Seal
What is the term for a group of fish swimming together in a coordinated manner?
a) School
b) Flock
c) Pod
d) Herd
Which of the following is an example of a filter-feeding marine organism?
a) Jellyfish
b) Shark
c) Seahorse
d) Krill
What is the largest species of shark?
a) Great white shark
b) Whale shark
c) Hammerhead shark
d) Tiger shark
Which of the following is an example of a sessile marine organism?
a) Sea anemone
b) Sea otter
c) Sea lion
d) Sea turtle
Which of the following is not a threat to coral reefs?
a) Overfishing
b) Pollution
c) Ocean acidification
d) Eutrophication
What is the largest species of sea turtle?
a) Leatherback turtle
b) Green turtle
c) Hawksbill turtle
d) Loggerhead turtle
Which of the following is a symbiotic relationship between two organisms in which both benefit?
a) Mutualism
b) Commensalism
c) Parasitism
d) Predation
What is the process by which marine organisms release eggs and sperm into the water for fertilization?
a) Spawning
b) Nesting
c) Laying
d) Incubation
Which of the following is an example of a marine reptile?
a) Sea turtle
b) Dolphin
c) Seal
d) Penguin
What is the term for a diverse underwater ecosystem formed by the skeletons of coral polyps?
a) Coral reef
b) Kelp forest
c) Mangrove forest
d) Seagrass meadow
Which of the following is a deep-sea marine zone with high pressure, low temperature, and complete darkness?
a) Abyssal zone
b) Intertidal zone
c) Pelagic zone
d) Neritic zone
What is the process by which marine organisms break down organic matter into simpler substances?
a) Decomposition
b) Digestion
c) Respiration
d) Fermentation
Which of the following is an example of a marine invertebrate?
a) Fish
b) Sea star
c) Dolphin
d) Penguin
What is the term for the area where freshwater meets saltwater, resulting in a mix of brackish water?
a) Estuary
b) Lagoon
c) Delta
d) Fjord
Which of the following is an example of a marine bird?
a) Albatross
b) Sea lion
c) Sea turtle
d) Sea snake
Which of the following is a method of locomotion used by marine organisms to move through the water?
a) Swimming
b) Crawling
c) Flying
d) Burrowing
What is the term for the gradual movement of marine organisms from one location to another?
a) Migration
b) Hibernation
c) Camouflage
d) Ecosystem
Which of the following is an example of a marine plant?
a) Kelp
b) Sea urchin
c) Sea anemone
d) Jellyfish
What is the process by which marine organisms exchange gases with their environment?
a) Respiration
b) Circulation
c) Osmoregulation
d) Excretion
Which of the following is an example of a marine cnidarian?
a) Jellyfish
b) Crab
c) Octopus
d) Shrimp
What is the term for the process of shedding the outer layer of skin or exoskeleton?
a) Molting
b) Shedding
c) Shivering
d) Sloughing
Which of the following is an example of a marine invertebrate chordate?
a) Sea star
b) Sea cucumber
c) Sea urchin
d) Sea squirt
What is the term for the study of marine organisms and their interactions with the environment?
a) Marine biology
b) Oceanography
c) Ecology
d) Marine geology
Which of the following is a marine reptile known for its long neck and powerful jaws?
a) Crocodile
b) Sea turtle
c) Komodo dragon
d) Anaconda
What is the term for the process by which marine organisms produce light?
a) Bioluminescence
b) Chemoluminescence
c) Phosphorescence
d) Fluorescence
Which of the following is an example of a marine crustacean?
a) Crab
b) Sea star
c) Sea anemone
d) Sea urchin
What is the term for the study of marine organisms and their distribution in the ocean?
a) Marine biology
b) Marine ecology
c) Marine geology
d) Marine geography
Which of the following is an example of a marine cnidarian with a bell-shaped body and tentacles?
a) Jellyfish
b) Sea star
c) Sea urchin
d) Sea cucumber
What is the term for the process by which marine organisms release excess salt from their bodies?
a) Osmoregulation
b) Respiration
c) Excretion
d) Filtration
Which of the following is an example of a marine mammal known for its playful behavior?
a) Dolphin
b) Sea turtle
c) Sea lion
d) Penguin
What is the term for the area of the ocean that extends from the shoreline to the edge of the continental shelf?
a) Neritic zone
b) Pelagic zone
c) Abyssal zone
d) Intertidal zone
Which of the following is an example of a marine echinoderm?
a) Sea star
b) Sea anemone
c) Sea cucumber
d) Jellyfish
What is the term for the process by which marine organisms maintain a stable internal environment?
a) Homeostasis
b) Adaptation
c) Ecosystem
d) Competition
Which of the following is an example of a marine plant that forms underwater forests?
a) Seagrass
b) Kelp
c) Mangrove
d) Algae
What is the term for the study of the physical and chemical properties of seawater?
a) Oceanography
b) Marine biology
c) Marine chemistry
d) Marine geology
What is the largest known species of jellyfish?
a) Moon jellyfish
b) Lion’s mane jellyfish
c) Box jellyfish
d) Comb jellyfish
Which of the following is an example of a marine bird known for its ability to dive underwater?
a) Albatross
b) Pelican
c) Puffin
d) Seagull
What is the term for the region of the ocean with high levels of sunlight and abundant marine life?
a) Euphotic zone
b) Aphotic zone
c) Twilight zone
d) Midnight zone
Which of the following is an example of a marine invertebrate with a hard external skeleton?
a) Crab
b) Fish
c) Dolphin
d) Seal
What is the term for the process by which marine organisms reproduce without the need for fertilization?
a) Asexual reproduction
b) Sexual reproduction
c) Internal fertilization
d) External fertilization
Which of the following is a marine reptile known for its ability to camouflage in its surroundings?
a) Sea turtle
b) Crocodile
c) Sea snake
d) Komodo dragon
What is the term for the process by which marine organisms extract oxygen from water?
a) Gaseous exchange
b) Osmosis
c) Diffusion
d) Respiration
Which of the following is an example of a marine mammal known for its migration across vast distances?
a) Whale
b) Dolphin
c) Seal
d) Manatee
What is the term for the phenomenon where ocean waters become depleted of oxygen, leading to hypoxic conditions?
a) Ocean acidification
b) Eutrophication
c) Dead zones
d) Coral bleaching
Which of the following is an example of a marine invertebrate known for its ability to regenerate lost body parts?
a) Starfish
b) Sea urchin
c) Sea anemone
d) Jellyfish
What is the term for the process by which marine organisms migrate to deeper waters during daylight and return to the surface at night?
a) Diel vertical migration
b) Horizontal migration
c) Longitudinal migration
d) Latitudinal migration
Which of the following is an example of a marine invertebrate known for its ability to produce bioluminescent light?
a) Firefly squid
b) Cuttlefish
c) Octopus
d) Squid
What is the term for the process by which marine organisms release excess salt through specialized glands?
a) Osmoregulation
b) Excretion
c) Filtration
d) Ion exchange
Which of the following is an example of a marine invertebrate with a soft and flexible body?
a) Jellyfish
b) Crab
c) Sea urchin
d) Sea star
What is the term for the process by which marine organisms release excess water from their bodies?
a) Osmoregulation
b) Respiration
c) Excretion
d) Filtration
Which of the following is an example of a marine invertebrate known for its ability to regenerate its entire body from a single body part?
a) Sea cucumber
b) Sea anemone
c) Sea urchin
d) Sea sponge
What is the term for the process by which marine organisms release waste products from their bodies?
a) Excretion
b) Osmoregulation
c) Filtration
d) Respiration
Which of the following is an example of a marine plant known for its ability to withstand harsh saltwater conditions?
a) Mangrove
b) Seagrass
c) Kelp
d) Algae
What is the term for the process by which marine organisms release excess water through specialized structures?
a) Osmoregulation
b) Excretion
c) Filtration
d) Ion exchange
Which of the following is an example of a marine invertebrate known for its ability to produce colorful shells?
a) Mollusk
b) Fish
c) Shark
d) Whale