Scientific method
What is the independent variable?
The thing that changes
Typically what is the depth range of coral?
0-40m
True or false seagrasses are an algae
False
What are the two classes of vessel in WA?
Registerable - has or can have a motor
Non-registerable - no motor e.g. sailing dingy
At what ages is wearing a lifejacket mandatory in unprotected waters?
1-12 Yrs old
What are the three types of variable in an experiment
Controlled, independent, dependant.
What is the name of the organism corals have a symbiotic relationship with?
Zooxanthellae
Do seagrasses prefer high or low energy environments? Provie one reason for your answer
Low
What are the two classes of water
Protected (inland waters)
Unprotected (coastal + Lake argyle)
What type of PFD must you wear on a PWC?
Type 50s or higher
Explain the features of a SALTy graph
Scale - clearly shown & consistent Independent on X axis Dependant on Y axis
Axis - increments clearly shown
Label - each axis including units
Title - explains the purpose of the graph
What substance to reef building corals produce?
Calcium Carbonate/Limestone
Describe the relationship between latitude and seagrass diversity in WA. How is this different from the global trend.
As latitude increases so does diversity. This is the opposite of the usual trend.
At what vessel length does the wearing of lifejackets become mandatory in unprotected waters?
less than 4.8m
What piece of safety equipment must you carry when you go beyond 4 NM from shore?
Marine Radio
What is a hypothesis and in what format should it be written?
It is an educated guess, written as If then because
To what phylum do corals belong?
Cnidaria
Describe two roles seagrasses fill in an ecosystem
Provide habitat, especially juvenile fish
Slow down water movement
Minimise the movement of sediment
Produce 02
When using a non-registerable vessel in unprotected waters, what type of lifejacket must you wear?
Level 50s or higher
What are the two types of marine radio and what is the emergency channel on each?
VHF 16
27 Mhz 88
How can you increase the reliability of an investigation?
Multiple trials
What are two abiotic factors that corals need to thrive?
Warm water
Low nutrient water
Low turbidity
Describe two threats to seagrasses
Coastal land clearing/erosion
Sewerage/waste run off
physical disturbance e.g. anchoring
Strong storms
What safety equipment is mandatory in unprotected waters, less than 4 NM from shore?
Lifejacket, Flares - two orange two red (or two parachute/rocket) or EVDS, GPS enabled EPIRB.
Where should safety equipment be stowed?
Somewhere that is easily accessible but protected from the elements