Question #1

What does unfiltered ballast water potentially contain that threatens the biodiversity of the GBR?

a) waste

b) foreign species

c) dirty water

d) sand

e) none of the above

Question #2

What causes coral bleaching?

a) Fertiliser runoff

b) Increasing water temperature

c) Loss of zooxanthellae

d) acidification of the water

e) all of the above

Question #3

The crown-of-thorns starfish is a predator of coral polyps. How many square metres of reef can one starfish devour in one year?

a) 1

b) 5

c) 3

d) 6

e) 10

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