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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 18 / 44





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a. Siphonophores

b. Ctenophora

c. Krill

d. Pteropods

Siphonophores are notable because

a. They are planktonic gelatinous carnivores

b. They are polymorphic colonies

c. They often have gas-filled floats

d. All of the above

Arrow worms

a. Feed upon phytoplankton

b. Maintain symbiotic algae

c. Feed upon bacteria

d. Are carnivores

Foraminifera and radiolaria share the following

a. They both secrete tests made of calcium carbonate

b. They both engulf food items with pseudopodia

c. They both lack sexual reproduction

d. They both are found only in high latitudes

Planktonic organisms are usually

a. Distributed at random in the water column

b. Found only at the air-water interface

c. Found near the surface during the day and at depth at night

d. Patchily distributed in the water column

Which of the following explanations of diurnal vertical migrations cannot be excluded by available data

a. Strong light is harmful

b. The zooplankton are seeking a certain temperature, which varies between day and night

c. Predation is stronger near the surface during daylight

d. Zooplankton are responding directly and only to diurnal changes in ambient light

Diurnal vertical migrations are a feature of

a. All phytoplankton and zooplankton

b. All zooplankton

c. Nearly all zooplankton capable of swimming

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