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Practice Quizzing
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1

The middle value in a series of sample values is called the .
2

In the case of a sample with an even number of observations, the sample median is determined as the average of the two middle observations.
A)TRUE
B)FALSE
3

Human influences on the marine ecosystem include
A)over harvesting of whales.
B)commercial harvesting of krill.
C)over fishing of cod.
D)all of the above.
4

Watersheds, which separate river basins, are defined by topographic .
5

In the Rocky Mountains, snowmelt water on the east side of the peak flows to the Atlantic Ocean while snowmelt water on the west side flows to the Gulf of Mexico.
A)TRUE
B)FALSE
6

Using the "stream order" classification system, headwater streams are _________.
A)considered third order
B)formed by joining two second order streams
C)raised in order because they join other streams
D)considered first order streams
7

The suggests that historical patterns of flooding strongly influence the exchange of nutrients and energy between the river channel and the floodplain and associated wetlands.
8

Which of the following is not an effect of a reservoir on a river's natural flow regime?
A)temperature alteration
B)obstruction to natural migratory fish migration
C)alteration in flood pulse
D)none of the above
9

In temperate streams, leaves and other plant parts make up the coarse particulate organic matter, or CPOM, and forms the major energy source for the stream ecosystem.
A)TRUE
B)FALSE
10

Which of the following is not one of Karr's stream rating categories?
A)water quality parameters
B)fish abundance and condition
C)trophic composition
D)number of species and species composition
E)none of the above
11

Degradation of aquatic systems generally decreases the percentage of omnivores and increases the number of piscivores and insectivores in the community.
A)TRUE
B)FALSE





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