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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
excessive growth of benthic organisms
B
all of the answers are correct
C
a lack of sea water
D
the need to survive osmotic stress and depletion of oxygen in the sediments
2) Estuary ecosystems act as nurseries for about ___% of commercial fish species
A
50
B
75
C
25
D
100
3) Estuaries contribute to the productivity of surrounding marine ecosystems by
A
providing nurseries and a steady stream of nutrients for many species
B
encouraging eutrophication
C
allowing all sediment from storm run off to reach them
D
all of the answers are correct
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
inner/upper
B
lower/upper
C
upper/lower
D
outer/inner
5) Adaptation that allow halophytes to survive in salt water include
A
sacrificial leaves
B
salt glands
C
stomata
D
all of the answers are correct
6) The two characteristics that make mangroves the basis for mangrove ecosystems includ
A
the ability to live entirely underwater
B
none of the answers are correct
C
strong tangled roots (habitats) and ability to hold soil is storm surges
D
special sap that repels large predators
7) Seagrasses differ from other halophytes because
A
they can live in very deep water
B
all of the answers are correct
C
they live entirely under water and even release pollen under water
D
they have the same internal salinity as sea 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
drying out and thermal stress
C
drowning and flooding
D
none of the answers are correct
10) Conditions that challenge organisms in littoral ecosystems
A
drying out
B
all of the answers are correct
C
water motion
D
thermal stress
*select an answer for all questions
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