Unit Test — Unit test Answers

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Due to decreased light penetration, which area of rivers and streams will have less diversity of plant life?

A
the source
B
the mouth
C
the middle portion
D
none of the above
2
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Which of the following is not a way that nonnative organisms are introduced to new aquatic ecosystems related to commerce?

A
cargo ship hulls
B
recreational boats
C
escape from aquariums
D
migration
3

The salinity in salt marshes can vary throughout the day because _______.

A
river flow changes throughout the day
B
the amount of salt water in a marsh depends upon ocean tides
C
daily winds and rains result in salt and fresh water mixing
D
salt water collects in the lowest elevations
4

Which of the following best defines sustainable fishing practices?

A
Harvesting practices that maximize yields and profits.
B
Harvesting practices that maximize the yield per fisherman.
C
Harvesting practices that do not reduce the potential for future harvests.
D
Harvesting practices that reduce the potential for future harvests.
5

Riparian zones can reduce the impact of water pollution.

A
T
B
F
6

Invasive species often unbalance the ecosystems into which they are introduced because _______.

A
they did not co-evolve with the natural species and lack natural controls, like predators
B
they breed quickly and have the potential to overpopulate an area
C
they consume local resources
D
none of the above
7

Which of the following is not a true statement regarding lakes?

A
Lakes are fed by rivers.
B
Lakes have waves.
C
Lakes are found in mountainous regions.
D
Lakes are smaller and more shallow than ponds.
8

A strategy to reduce, reuse, and recycle would improve ocean health by _______.

A
removing marine debris from the oceans
B
reducing the amount of garbage available to enter the ocean
C
removing garbage from landfills
D
increasing the rate of plankton growth
9

Fish that feed on sediment will most likely be found in _______ rivers.

A
shallow
B
narrow
C
deep
D
fast-moving
10

What characteristic is important for plants found in saltwater wetlands?

A
tolerance to high temperatures
B
tolerance to salinity
C
a range of climate zones
D
all of the above
11

Which of the following factors is least influential in affecting the biodiversity of wetlands?

A
type of wetland
B
food abundance
C
high levels of nutrients
D
water abundance
12

The principle difference between where salt marshes and mangrove forests grow is _______.

A
the salinity of the water
B
the amount of sunlight the plants receive
C
the intensity of the waves along the coast
D
the extent of human development in the area
13

Mangrove forests were traditionally viewed as _______.

A
unproductive wastelands
B
valuable fish habitats
C
an erosion preventing habitat
D
pollution filters
14

Which of the following is not a characteristic of rivers and streams?

A
vary in size
B
mainly saltwater
C
part of the water cycle
D
flow toward other bodies of water
15

Location plays a role in wetland type, but is not the sole determining factor.

A
T
B
F
16

It is best to say that marine debris _______.

A
is a hazard to marine animals
B
degrading ocean health
C
a pervasive, global pollution problem
D
all of the above
17

Which of the following is a way that humans impact rivers and streams?

A
pollution
B
dams
C
flooding
D
all of the above
18

The effects of agriculture and industry can be more harmful with the further loss of wetlands.

A
T
B
F
19

Which of the following is not an example of mechanical control of nonnative species?

A
pulling
B
inspections
C
net barriers
D
mowing
20

An increase in the number of phytoplankton in an aquatic ecosystem is always beneficial.

A
T
B
F

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