Australian Great Barrier Reef MCQs with Answer

What is the largest living structure on Earth?

A) Amazon Rainforest
B) Great Barrier Reef
C) Mount Everest
D) Grand Canyon
Answer: B) Great Barrier Reef
Which marine animal is responsible for building the Great Barrier Reef?

A) Clownfish
B) Coral polyps
C) Seahorses
D) Sea turtles
Answer: B) Coral polyps
Approximately how many species of fish inhabit the Great Barrier Reef?

A) 500
B) 1,000
C) 1,500
D) 2,000
Answer: D) 2,000
What is the primary threat to the Great Barrier Reef?

A) Pollution
B) Overfishing
C) Climate change
D) Invasive species
Answer: C) Climate change
Which of these cities is closest to the Great Barrier Reef?

A) Sydney
B) Perth
C) Cairns
D) Melbourne
Answer: C) Cairns
Which year was the Great Barrier Reef declared a UNESCO World Heritage Site?

A) 1960
B) 1975
C) 1981
D) 1990
Answer: C) 1981
What percentage of the Great Barrier Reef is protected by the Great Barrier Reef Marine Park?

A) 25%
B) 50%
C) 75%
D) 99%
Answer: C) 75%
Which phenomenon causes the vibrant colors in coral reefs?

A) Bacterial action
B) Algal blooms
C) Photosynthesis
D) Symbiotic relationships with algae
Answer: D) Symbiotic relationships with algae
What is the northernmost tip of the Great Barrier Reef called?

A) Cape York
B) Fraser Island
C) Whitsunday Island
D) Lizard Island
Answer: A) Cape York
Which type of shark is commonly found in the Great Barrier Reef?

A) Bull shark
B) Hammerhead shark
C) Great white shark
D) Nurse shark
Answer: A) Bull shark
What is the approximate length of the Great Barrier Reef?

A) 500 kilometers
B) 1,000 kilometers
C) 2,300 kilometers
D) 3,500 kilometers
Answer: C) 2,300 kilometers
Which species uses the Great Barrier Reef as a breeding ground?

A) Humpback whales
B) Blue whales
C) Beluga whales
D) Killer whales
Answer: A) Humpback whales
What is the main threat to the coral in the Great Barrier Reef due to climate change?

A) Ocean acidification
B) Decreased water temperature
C) Increased salinity
D) Stronger currents
Answer: A) Ocean acidification
How many islands and islets make up the Great Barrier Reef?

A) Over 100
B) Over 500
C) Over 1,000
D) Over 2,000
Answer: D) Over 2,000
What is the name of the world’s largest green turtle nesting site in the Great Barrier Reef?

A) Turtle Island
B) Heron Island
C) Green Island
D) Lady Elliot Island
Answer: B) Heron Island
What percentage of Australia’s total fish species can be found in the Great Barrier Reef?

A) 10%
B) 25%
C) 50%
D) 75%
Answer: C) 50%
Which famous naturalist and scientist extensively studied the Great Barrier Reef?

A) Charles Darwin
B) Isaac Newton
C) Galileo Galilei
D) Albert Einstein
Answer: A) Charles Darwin
What percentage of the Great Barrier Reef is damaged due to coral bleaching?

A) 10%
B) 25%
C) 50%
D) 80%
Answer: D) 80%
What is the main cause of coral bleaching in the Great Barrier Reef?

A) Pollution
B) Rising sea levels
C) Ultraviolet radiation
D) Warmer water temperatures
Answer: D) Warmer water temperatures
What is the most famous shipwreck located near the Great Barrier Reef?

A) HMS Pandora
B) SS Yongala
C) HMS Endeavour
D) SS Maheno
Answer: B) SS Yongala
Which year was the Great Barrier Reef Marine Park Authority established?

A) 1960
B) 1975
C) 1981
D) 1990
Answer: B) 1975
Which of these animals is a threatened species found in the Great Barrier Reef?

A) Dugong
B) Manatee
C) Sea otter
D) Walrus
Answer: A) Dugong
What is the approximate age of the Great Barrier Reef?

A) 50,000 years old
B) 100,000 years old
C) 500,000 years old
D) 2 million years old
Answer: B) 100,000 years old
Which type of ecosystem is the Great Barrier Reef primarily composed of?

A) Freshwater marshes
B) Estuaries
C) Coral reefs
D) Kelp forests
Answer: C) Coral reefs
What is the average depth of the waters surrounding the Great Barrier Reef?

A) 50 meters
B) 100 meters
C) 200 meters
D) 500 meters
Answer: C) 200 meters
Which indigenous group has traditional connections to the Great Barrier Reef?

A) Maori
B) Aboriginal Australians
C) Inuit
D) Native Americans
Answer: B) Aboriginal Australians
What is the main factor threatening the habitats of marine species in the Great Barrier Reef?

A) Human settlement
B) Overfishing
C) Oil spills
D) Coastal development
Answer: D) Coastal development
Which of these is not a UNESCO World Heritage criteria under which the Great Barrier Reef is recognized?

A) Natural beauty
B) Geological significance
C) Biodiversity
D) Human settlement
Answer: D) Human settlement
What is the approximate size of the Great Barrier Reef Marine Park in square kilometers?

A) 50,000 sq km
B) 100,000 sq km
C) 200,000 sq km
D) 350,000 sq km
Answer: D) 350,000 sq km
Which of the following statements about the Great Barrier Reef is true?

A) It can be seen from space without aid
B) It is entirely made of dead coral
C) It only houses fish species
D) It experiences no human impact
Answer: A) It can be seen from space without aid
What type of rays are commonly found in the Great Barrier Reef?

A) Manta rays
B) Stingrays
C) Eagle rays
D) Electric rays
Answer: B) Stingrays
Which event caused the largest coral bleaching in the Great Barrier Reef’s history?

A) El Niño
B) La Niña
C) Indian Ocean Dipole
D) Arctic Oscillation
Answer: A) El Niño
What is the Great Barrier Reef’s economic value in terms of contributing to the Australian economy annually?

A) Approximately $1 billion
B) Approximately $6 billion
C) Approximately $10 billion
D) Approximately $20 billion
Answer: B) Approximately $6 billion
Which species of sea turtle is most commonly found in the Great Barrier Reef?

A) Loggerhead turtle
B) Leatherback turtle
C) Hawksbill turtle
D) Olive ridley turtle
Answer: A) Loggerhead turtle
What is the primary cause of coral bleaching?

A) Pollution
B) Rising sea levels
C) Ocean acidification
D) Warmer water temperatures
Answer: D) Warmer water temperatures
Which type of animal is often called the “gardener” of the Great Barrier Reef?

A) Sea cucumbers
B) Sea urchins
C) Parrotfish
D) Octopus
Answer: C) Parrotfish
What percentage of the world’s reef systems are represented by the Great Barrier Reef?

A) 10%
B) 25%
C) 50%
D) 75%
Answer: A) 10%
Which of these activities is prohibited within the Great Barrier Reef Marine Park?

A) Recreational fishing
B) Scuba diving
C) Commercial shipping
D) Dumping of waste
Answer: D) Dumping of waste
What phenomenon causes the “Coral Spawning” in the Great Barrier Reef?

A) Changing tides
B) Lunar cycle
C) Earth’s magnetic field
D) Seasonal temperature changes
Answer: B) Lunar cycle
What is the primary role of the Great Barrier Reef Marine Park Authority?

A) Conservation and protection
B) Commercial development
C) Tourism promotion
D) Oil exploration
Answer: A) Conservation and protection

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