10/18/25, 8:17 PM MARINE BIO (FISH 250) EXAM 2 WITH CORRECT ANSWERS
MARINE BIO (FISH 250) EXAM 2 WITH CORRECT
ANSWERS\LATEST UPDATE 2025-2026
Terms in this set (64)
1. Stay within an optimal zone
Adaptations for surviving 2. Find enough food to eat and grow
in the epipelagic zone 3. Find mates and successfully reproduce
4. Avoid being eaten
(Density of organisms - Density of water)
sinking rate ________________________
(surface resistance of organism x viscosity of water)
Which aspects of the ~Density & surface resistance of organisms
sinking rate can be
altered?
~Substitute heavy ions with lighter ones
~Developing flotation mechanisms
~Accumulate oils and fat
What are some ways
~Have a cartilaginous skeleton
organisms can decrease
~Increase surface resistance of body
their density?
~Be small
~Learn how to swim
~Reynolds number
1/10
, 10/18/25, 8:17 PM MARINE BIO (FISH 250) EXAM 2 WITH CORRECT ANSWERS
~GAS/FLUID-FILLED FLOATS: some cnidarians secrete
gases to create little air sacs that can deflate in the
event of an attack on the surface
What flotation ~SWIM BLADDER: gases are secreted into the bladder
mechanisms do various at the same pressure as the feeesh to maintain
organisms use? buoyancy
~BE OILY: like sharks, keeping oil in the liver
determines buoyancy because its less dense than
seawater
What types of organisms ~Benthic species, such as flatfish
don't need swim ~Highly migratory species that need to move quickly,
bladders? such as blue fin tuna
~Flattened body shape & appendages
How can an organism
~Have spiny/spiky projections to increase surface area
increase its surface
but not volume
resistance?
~Be super small!
(inertial forces)
_______________________
How is the Reynolds
(Viscous forces)
number (Re) calculated?
Small Re = slow, dominated by viscous forces
Large Re = fast, dominated by inertial forces
~Build a collection device/filter
~Have the capability to degrow during periods of
What are ways to find
starvation
enough food to eat and
~Be big in size!
grow in the epipelagic
~Hunt in groups (cooperative hunting)
zone?
~Stay with your food
~Know where your food will be
~Acts as a strainer
What is the benefit of
~Collects particles/phytoplankton when swimming
building a collection
around
device/filter?
~Gets nourishment from the water
2/10
MARINE BIO (FISH 250) EXAM 2 WITH CORRECT
ANSWERS\LATEST UPDATE 2025-2026
Terms in this set (64)
1. Stay within an optimal zone
Adaptations for surviving 2. Find enough food to eat and grow
in the epipelagic zone 3. Find mates and successfully reproduce
4. Avoid being eaten
(Density of organisms - Density of water)
sinking rate ________________________
(surface resistance of organism x viscosity of water)
Which aspects of the ~Density & surface resistance of organisms
sinking rate can be
altered?
~Substitute heavy ions with lighter ones
~Developing flotation mechanisms
~Accumulate oils and fat
What are some ways
~Have a cartilaginous skeleton
organisms can decrease
~Increase surface resistance of body
their density?
~Be small
~Learn how to swim
~Reynolds number
1/10
, 10/18/25, 8:17 PM MARINE BIO (FISH 250) EXAM 2 WITH CORRECT ANSWERS
~GAS/FLUID-FILLED FLOATS: some cnidarians secrete
gases to create little air sacs that can deflate in the
event of an attack on the surface
What flotation ~SWIM BLADDER: gases are secreted into the bladder
mechanisms do various at the same pressure as the feeesh to maintain
organisms use? buoyancy
~BE OILY: like sharks, keeping oil in the liver
determines buoyancy because its less dense than
seawater
What types of organisms ~Benthic species, such as flatfish
don't need swim ~Highly migratory species that need to move quickly,
bladders? such as blue fin tuna
~Flattened body shape & appendages
How can an organism
~Have spiny/spiky projections to increase surface area
increase its surface
but not volume
resistance?
~Be super small!
(inertial forces)
_______________________
How is the Reynolds
(Viscous forces)
number (Re) calculated?
Small Re = slow, dominated by viscous forces
Large Re = fast, dominated by inertial forces
~Build a collection device/filter
~Have the capability to degrow during periods of
What are ways to find
starvation
enough food to eat and
~Be big in size!
grow in the epipelagic
~Hunt in groups (cooperative hunting)
zone?
~Stay with your food
~Know where your food will be
~Acts as a strainer
What is the benefit of
~Collects particles/phytoplankton when swimming
building a collection
around
device/filter?
~Gets nourishment from the water
2/10
