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MB Ch 14 3/4
Test Description: .
Instructions: Answer all questions to get your test result.
1) Factors that limit the production of estuary ecosystems include
A
a lack of sea water
B
excessive growth of benthic organisms
C
the need to survive osmotic stress and depletion of oxygen in the sediments
D
all of the answers are correct
2) Estuary ecosystems act as nurseries for about ___% of commercial fish species
A
50
B
25
C
100
D
75
3) Estuaries contribute to the productivity of surrounding marine ecosystems by
A
allowing all sediment from storm run off to reach them
B
providing nurseries and a steady stream of nutrients for many species
C
all of the answers are correct
D
encouraging eutrophication
4) 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
lower/upper
B
outer/inner
C
inner/upper
D
upper/lower
5) Adaptation that allow halophytes to survive in salt water include
A
salt glands
B
stomata
C
all of the answers are correct
D
sacrificial leaves
6) The two characteristics that make mangroves the basis for mangrove ecosystems includ
A
special sap that repels large predators
B
the ability to live entirely underwater
C
none of the answers are correct
D
strong tangled roots (habitats) and ability to hold soil is storm surges
7) Seagrasses differ from other halophytes because
A
all of the answers are correct
B
they live entirely under water and even release pollen under water
C
they have the same internal salinity as sea water
D
they can live in very deep water
8) Seagrass ecosystem differ from other halophyte based ecosystems becuase
A
they can live in very deep water
B
all of the answers are correct
C
they do not require fresh water
D
the sea grasses provide food for ecosystem inhabitants
9) The greatest challenges to life in a supra littoral ecosystem are
A
predators and pollution
B
drowning and flooding
C
drying out and thermal stress
D
none of the answers are correct
10) Conditions that challenge organisms in littoral ecosystems
A
all of the answers are correct
B
thermal stress
C
water motion
D
drying out
*select an answer for all questions
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