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- 1. Multiple Choice
Which factors can have the greatest effect on the health of a river system?
type of soil and salinity
nitrate levels and turbidity
human consumption and pH
natural disasters and tidal changes
- 2. Multiple Choice
Which will most likely happen to a biological indicator species if there is a sudden increase in pollution?
There will be a significant increase in the population numbers and the quality of the individuals.
There will be a significant decrease in the population numbers and the quality of the individuals.
The biological indicator species will reproduce at lower rates, which will maintain population numbers.
The biological indicator species will reproduce at higher rates, which will maintain population numbers.
- 3. Multiple Choice
How might fertilizer runoff from a soybean field affect the quality of water in the farm pond?
It increases the pH level.
It decreases the overall water temperature.
It promotes algae growth, which lowers the oxygen level in the pond.
It decreases the turbidity, which lowers the amount of particles in the pond.
- 4. Multiple Choice
After analyzing data collected from a pond, there is a significant decrease in dissolved oxygen. Which most likely caused the decline?
an increase in minerals
an increase in sediment
an increase in algae growth
an decrease in fish population
- 5. Multiple Choice
What most directly affects the amount of dissolved oxygen in a body of water?
pH
salinity
temperature
turbidity
- 6. Multiple Choice
Which most likely has the highest number of contaminants in the water?
a water system with moderate turbidity
a water system with high turbidity
a water system with low turbidity
a water system with no turbidity
- 7. Multiple Choice
A measure of the natural populations of algae, plants, fish, and other wildlife provides evidence of the health of a body of water. By which term are these measures known?
pH indicators
bio-indicators
abiotic factors
turbidity factors
- 8. Multiple Choice
Which is most likely to happen when river water temperature rises above 35°C?
The water will become polluted.
The dissolved oxygen levels will increase.
There will be negative health effects on wildlife.
There will be decreased evaporation from the river.
- 9. Multiple Choice
Which best describes the relationship between temperature and dissolved oxygen in a lake?
As temperature increases, dissolved oxygen increases.
As temperature increases, dissolved oxygen decreases.
As temperature decreases, dissolved oxygen decreases.
A change in temperature has no effect on dissolved oxygen.
- 10. Multiple Choice
Which best determines the health of a lake used as a source of freshwater?
its depth and width
its temperature and pH
its location and depth
its temperature and depth
- 11. Multiple Choice
Which would lead to the greatest reduction of dissolved oxygen in a lake?
decreased number of fish in the lake
increased number of fish in the lake
increased nutrients and algal blooms
decreased number of plants surrounding the lake
- 12. Multiple Choice
Which would most affect the health of fish in a local pond?
The daily release of hot water into the pond from a local factory.
A storm temporarily stirring up water and sediments in the pond.
The occasional erosion of sediments into the pond from a nearby field.
A slight increase in the number of people who fish in the pond for food.
- 13. Multiple Choice
A recreational lake experiences eutrophication because of excess nutrients. Based on this information, how would the recreational lake most likely appear?
clear and blue
oily and greasy
murky and full of algae
orange and rust-colored
- 14. Multiple Choice
Fish tank owners will often add ammonia to the tank to increase the nitrate levels. If too much ammonia is added, what might occur?
Algae growth will stop, and oxygen will not be produced.
Algae growth will increase, causing oxygen levels to increase.
Algae growth will increase, causing oxygen levels to decrease.
Algae growth will decrease, causing oxygen levels to decrease.
- 15. Multiple Choice
Which is the best example of a point source pollution?
runoff from fields
pesticides sprayed into the air
oil spill from a boat in the Atlantic Ocean
smoke from multiple industries in a large city
- 16. Multiple Choice
Which is an accurate prediction of the pH of a lake that receives large amounts of acid rain?
4-5
6-7
8-9
10-11
- 17. Multiple Choice
Which aspect of fertilizer pollution would have the greatest negative impact on an aquatic ecosystem?
Nitrates poison the water that fish breathe through their gills.
Microorganisms in the water absorb all the oxygen, suffocating animals.
Aquatic animals increase, adding producers to the food chain and feeding fish.
Algal blooms deplete the oxygen and block the sunlight from penetrating a body of water.
- 18. Multiple Choice
Which process would most likely increase the dissolved oxygen level in a freshwater lake?
algae bloom
lake turnover
photosynthesis
respiration
- 19. Multiple Choice
Which will best show lakes, rivers, and streams are healthy?
large amounts of algae
large amounts of nitrates
large amounts of decomposers
large amounts of dissolved oxygen
- 20. Multiple Choice
How are indicator species like a warning system for bodies of water?
They indicate when food sources are declining.
Their illness or death indicates pollution in an aquatic ecosystem.
They indicate when predators are reducing the numbers of a species.
Their illness or death indicates the body of water is becoming more populated.
- 21. Multiple Choice
Why does fertilizer pollution stimulate the growth of algae in a pond?
Algae are producers and use the fertilizer’s nutrients to rapidly multiply.
Algae are producers and use the fertilizer’s nutrients during decomposition.
Algae are parasites and absorb energy from the fertilizers in order to grow.
Algae are herbivores that feed off of the plants, which grow due to the excess fertilizers.
- 22. Multiple Choice
The local middle school has a fish pond in the courtyard. The pond water is suffering from eutrophication. Which most likely caused this problem?
poor filtration
direct sunlight
fertilizer runoff
improper cleaning
- 23. Multiple Choice
Why do biologists use indicator species?
to compare freshwater and ocean ecosystems
to count the number of organisms present
to monitor water quality and biodiversity
to analyze the dominant species
- 24. Multiple Choice
Which best explains the importance of pH in determining the health of a water system?
Most organisms living in water are able to adapt to changing water pH.
Variations in the pH of water can indicate the presence of toxic substances.
A low pH in ground water encourages the growth of photosynthetic organisms.
Variations in the pH of water can affect the ability of water to absorb atmospheric gases.
- 25. Multiple Choice
Which is the most likely effect of too much nitrogen and phosphorus flowing into a lake?
algal blooms
greater salinity
decreased turbidity
lower temperature
- 26. Multiple Choice
Why does a cloudy river produce less plant life than a clear river?
A cloudy river flows freely, while a clear river does not.
A cloudy river has few dissolved nutrients, while a clear river has many.
A cloudy river absorbs little heat, while a clear river absorbs much heat.
A cloudy river blocks sunlight from reaching plants, while a clear river allows sunlight to be absorbed by plants.
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