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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 38 / 44





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b. The lack of a closing device, resulting in washout of bottom organisms

c. The lack of ships capable of deploying deep-sea samplers

d. All of the above

In deep-sea sediments below gyres centers, sediments

a. Organic matter supply is not particularly less than in the deep sea nearer to the continental slope

b. Organic matter is completely absent

c. Sediments are black because of the input of organic matter

d. Sediments have the lowest organic matter in the deep sea

Temperature in the deep-sea abyssal plain

a. Is the coldest on earth

b. Is seasonally and spatially very stable

c. Has about the same annual range as coastal mid-latitude shelf waters

d. Is stable at about 10 degrees C

The number of benthic species

a. Increases continuously from the continental shelf coral reefs to the abyssal plain

b. Increases continuously from the continental shelf soft sediments to those of the abyssal plain

c. Decreases from continental shelf muddy sediments to the continental slope, then increases again

d. Increases from shelf muds to the depths of the continental rise, then decreases towards the abyssal plain

The high biomass adjacent to hot vents depends upon the release of

a. Sulfur from the vents

b. Nitrogen from the vents

c. Phosphorus from the vents

d. Bacteria from the vents

Vestimentiferans can live without a gut because

a. They live near sources of dissolved organic matter

b. They are parasites living within the guts of bivalves

c. They have symbiotic bacteria, which are the source of their nutrition

d. They are protistans

Bivalves and vestimentiferans living near vents

a. Have very slow growth rates

b. Have growth rates similar to typical abyssal benthos

c. Grow only in response to falls of phytoplankton detritus

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