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Reading Explorer 4 Unit 2A
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What is meant by the "burglar alarm" effect?
Organisms produce light, which attracts the predators of their predators. (Enemy of an enemy is a friend.)
The "Bahia Bioluminiscente" or "Bio Bay" is home to ________ dinoflagellates that light up when the water moves.
 
countless
 
limited amounts
 
unique
 
creatures
But if the aim is to remain invisible, why do some creatures light up when they are touched, or when the water nearby is _________?
 
disturbed
 
wavy
 
still
 
hot
Jellyfish and swimming snails are ________, ghostlike creatures, almost impossible to see.
 
transparent
 
colourful
 
bioluminescent
 
white
Any life form that stands out is in danger of being spotted by _________.
 
predators
 
sharks
 
fishermen
 
mermaids
In the ocean's upper _____, where light penetrates, creatures need to blend in to survive.
 
layers
 
coral
 
shelf
 
waters
The ocean becomes a perpetual twilight, blue disappears, the ocean is as black as the night sky. These _____ make light uniquely useful as a weapon or veil.
 
factors
 
characteristics
 
situations
 
elements
As you ______, sunlight disappears.
 
descend
 
ascend
 
rise
 
fall
When surviving in the sea, there is almost nowhere to hide, so being _______ is very important.
 
invisible
 
visible
 
covered in coral
 
blue
In the sea, an _______ number of beings can make light.
 
astonishing
 
diminishing
 
outrageous
 
around normal
Fireflies can create light, ________ to attract mates on a warm summer night.
 
flashing
 
dying
 
trying
 
dimming
Why might it be useful for an organism to be bioluminescent?
for protection, to find prey, to attract a mate
What types of animals do you know that are bioluminescent?
fireflies, jellyfish, squid, some types of worms
In what ways do you think the characteristics of brightness, shininess, or spectacular features help the animals?
They can help the animals survive through camouflage, or by scaring predators away.
Which animals are know for their bright colours or spectacular appearance?
chameleons, poison dart frogs, blue morpho butterfly, scarlet macaw, toucan, lionfish, mandrill


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