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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 30 / 44

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b. Bones in a fish

c. Axial skeleton of a whale

d. A bivalve foot

Interstitial animals all

a. Are usually worm-like in shape

b. Can swim away from the sediment

c. Have high fecundity

d. All of the above

The RPD

a. Is a border between the presence and absence of bacteria

b. Is only found in estuarine sediments

c. May only be a horizontal surface

d. Is a border between oxidative and reducing processes in sediments

Deposit feeders

a. Routinely digest cellulose and other refractory compounds in sediments

b. Can digest diatoms but poorly digest bacteria

c. Can usually digest diatoms and many bacteria

d. Digest bacteria only

Some large benthic invertebrates lack a gut because

a. They feed on dissolved organic matter

b. They have symbiotic bacteria, which provide nutrients

c. They have very low metabolic needs

d. No large benthic invertebrates lack a gut

If you are a deposit feeder, it may be bad to process sediment through your gut too quickly because

a. You may suffer osmotic problems

b. You will not have an opportunity to expose the food to digestive enzymes

c. The sediment will become too watery

d. You will be exposed inevitably to sulfide

Passive suspension feeders may change their overall body form as they grow because

a. They develop reproductive structures

b. They always grow into turbulent flow

c. They may grow in complex flow near the bottom, but unidirectional flow off of the bottom

d. They must be able to bend over in flow off of the bottom in all cases

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