Water Quality And Water On Earth Question Preview (ID: 33693)


Review For Water Quality And Water On Earth.[print questions]

A species which is used to indicate the health of an environment or ecosystem.
a) Health indicator
b) Aquatic barometers
c) Species indicators
d) Bioindicators

What instrument is used to measure turbidity?
a) Thermometer
b) Hydrometer
c) Secchi disk
d) Barometer

What is one way to decrease the turbidity in a stream?
a) Plant trees and shrubs on the banks of the stream
b) Remove all of the trees and shrubs on the banks of the stream
c) Cut deep channels into the banks on the side of the stream
d) Build a dam on the stream to slow the flow of water

Which factor below will not affect the temperature of an aquatic ecosystem.
a) The pH
b) The depth of the water
c) The amount of shade received from shoreline vegetation
d) The time of the year

What is the measure of the amount of suspended material found in a water system?
a) pH
b) Turbidity
c) Bioindicators
d) Dissolved oxygen

What can an excess amount of phosphates and nitrates do to an aquatic ecosystem?
a) Increase the dissolved oxygen level which would increase the number of fish
b) Increase the amount of algae would would eventually decrease the dissolved oxygen levels
c) Decrease the amount of algae which would decrease the number of fish
d) Would not affect the water system.

What is neutral pH?
a) 0
b) 5
c) 7
d) 10

What is the most likely source of phosphates and nitrates?
a) Fertilizers and pollution
b) Waste and warm water discharge
c) Fertilizers and effluents dumped into a stream
d) Sewage and fertilizers

The oxygen found in the water molecule (H20) is the oxygen that fish can use to breathe.
a) True
b) False
c)
d)

What can happen if the dissolved oxygen level drop below normal levels?
a) Plants can die.
b) Fish will overpopulate
c) The water will turn blue
d) Fish will begin to die

Which contains the most dissolved oxygen?
a) Hot, stagnant water
b) Cold, stagnant water
c) Cold, running water
d) Hot, running water

What is the measure of the acidic or basic level of a water system?
a) Eutrophicaton
b) pH
c) Dissolved oxygen
d) Turbidity

What percent of the water on Earth is freshwater?
a) 25%
b) 33%
c) 75%
d) 3%

Where is most of the freshwater on Earth located?
a) Underground
b) In rivers
c) Frozen in glaciers and at the poles
d) In lakes

Which ocean is the largest?
a) Pacific
b) Atlantic
c) Indian
d) Artic

Which below is not a way that dissolved oxygen can get into a water system.
a) By diffusion from the surrounding air
b) By aeration of water that has tumbled over falls and rapids.
c) By decomposition of organic matter by bacteria.
d) By plants during photosynthesis

Over the last million years, what has happened to the total amount of water on earth?
a) decreased
b) increased
c) remained about the same
d) risen and fallen

What percent of the water on Earth is salt water?
a) 97%
b) 25%
c) 50%
d) 70%

Water makes up what fraction of the human body?
a) 1/2
b) 1/3
c) 2/3
d) 4/5

The place where an organism lives and that provides the things it needs to survive is its
a) ecosystem
b) habitat
c) environment
d) home

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