MB Ch 14 3/4 Question Preview (ID: 5377)


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Factors that limit the production of estuary ecosystems include
a) a lack of sea water
b) the need to survive osmotic stress and depletion of oxygen in the sediments
c) excessive growth of benthic organisms
d) all of the answers are correct

Estuary ecosystems act as nurseries for about ___% of commercial fish species
a) 25
b) 50
c) 75
d) 100

Estuaries contribute to the productivity of surrounding marine ecosystems by
a) providing nurseries and a steady stream of nutrients for many species
b) allowing all sediment from storm run off to reach them
c) encouraging eutrophication
d) all of the answers are correct

In the _______ marsh of a salt water marsh, organisms must deal with salt water as a regular part of the tidal cycle. The ______ marsh by contrast includes areas rarely flooded by
a) upper/lower
b) inner/upper
c) lower/upper
d) outer/inner

Adaptation that allow halophytes to survive in salt water include
a) stomata
b) sacrificial leaves
c) salt glands
d) all of the answers are correct

The two characteristics that make mangroves the basis for mangrove ecosystems includ
a) strong tangled roots (habitats) and ability to hold soil is storm surges
b) the ability to live entirely underwater
c) special sap that repels large predators
d) none of the answers are correct

Seagrasses differ from other halophytes because
a) they live entirely under water and even release pollen under water
b) they can live in very deep water
c) they have the same internal salinity as sea water
d) all of the answers are correct

Seagrass ecosystem differ from other halophyte based ecosystems becuase
a) they do not require fresh water
b) they can live in very deep water
c) the sea grasses provide food for ecosystem inhabitants
d) all of the answers are correct

The greatest challenges to life in a supra littoral ecosystem are
a) drying out and thermal stress
b) predators and pollution
c) drowning and flooding
d) none of the answers are correct

Conditions that challenge organisms in littoral ecosystems
a) drying out
b) thermal stress
c) water motion
d) all of the answers are correct

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