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- 1. Multiple Choice
Which water quality indicator can be determined by measuring how light travels through water?
turbidity
temperature
nutrient level
dissolved oxygen
- 2. Multiple Choice
Which process would most likely increase the dissolved oxygen level in a freshwater lake?
algae bloom
lake turnover
photosynthesis
respiration
- 3. Multiple Choice
Which is the most likely result of an increase in the level of nitrates in a body of water?
increase in turbidity
increase in plant growth
increase in fish population
increase in water temperature
- 4. 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.
- 5. 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
- 6. Multiple Choice
Which would be the most likely cause of large numbers of fish dying in a stream?
a lack of nitrogen
high levels of mercury
decreased carbon dioxide
low dissolved oxygen concentration
- 7. 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
- 8. 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.
- 9. Multiple Choice
What does pH measure?
acidity/alkalinity
dissolved oxygen
nutrient level
turbidity
- 10. Multiple Choice
A new golf course is built next to a river. Over the past several months, the nitrate levels of the water in the river have been increasing. Which best explains the cause of the increasing nitrate levels?
increased growth of algae
decreased biodiversity
runoff from fertilizer
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