#8 Watersheds II

Which of the following is a non-point source of water pollution

• Effluent from a sewage treatment plant
• BP refiner in Indiana discharging ammonia in a river.
• Runoff of pesticides from regional farms into the Illinois River.
• Hot water discharges from a nuclear power plant.

pollution from a definable source

• Pollutant
• Pollution
• Non-point Source Pollution
• Point Source Pollution

Water with high turbidity 

• is cloudy and hard to see through
• is clear

Which causes a decrease in the amount of dissolved oxygen in a lake?

• lower temperatures
• fertilizer runoff
• overfishing

Which of the following is most responsible for reducing availability of freshwater in the US?

• aquifer depletion
• droughts
• nonpoint source pollution
• nuclear power plant waste

Which statement is true about streamside vegetation?

• trees provide shade, which makes water too cold for most animals
• roots help stabilize shorelines, preventing erosion
• leaves that fall into the water pollute the stream
• plants along a stream steal oxygen from the animals

How could pesticides get into lakes and streams?

• too much could be used
• it could be sprayed too close to a stream
• rain could wash pesticides into a stream
• all of the above

Which of the following is an effect of excess fertilizer washing into streams and lakes?

• the pH is too low for plants and animals
• cooler water holds more oxygen
• increased sediment reduces oxygen
• algae "blooms", leading to lower oxygen

High turbidity indicates poor water quality because

• it clogs the gills of aquatic animals and makes it difficult to breathe
• it makes it hard for sun to get to the aquatic plants
• it makes it hard for aquatic animals to find their food
• all are reasons high turbidity indicates poor water quality

The presence of pollution intolerant macroinvertebrates like stonefly and caddisfly indicates

• good quality water
• poor quality water