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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 17 / 44





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Chapter 7

Plankton that spend part of their life cycle in the water column, but live as adults in the benthos are

a. Mixoplankton

b. Meroplankton

c. Pleuston

d. Holoplankton

Nannoplankton have a size range of

a. 1-2 micrometers

b. 2 - 20 micrometers

c. 20-200 micrometers

d. < 1 micrometer

Many planktonic organisms have excesses of ammonium, sodium, and chloride relative to sea water because

a. They must regulate ionic concentrations in estuaries

b. They evolved in the deep sea and retain the chemistry of the deep sea

c. These excesses are substitutions of ions of lower density, which counteracts sinking

d. All of the above

Nautilus adjusts its vertical position in the water column by means of

a. Gas secretion

b. Use of low density ions

c. Swimming upwards continuously

d. Delicate projections from the shell that prevent sinking

During asexual reproduction in diatoms

a. Generation time decreases steadily

b. Part of the silica shell is cast off with each cell division

c. Cell size decreases steadily to a threshold

d. Are unique among phytoplankton in having resting stages on the bottom


a. Are abundant only in estuaries

b. Are capable of nitrogen fixation

c. Cannot live in stagnant waters

d. Only occur in chains of cells

Calanoid copepods are most closely related to

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