Abiotic Factors

Abiotic Factors

Multiple Choice

Which word would scientists use to describe the materials that make up the bottom of a body of water?

• sand

• substrate

• muck

• silt

Multiple Choice

A major benefit of currents to the living organisms in a stream would be

• fast movements

• Provides food materials

• erosion of the soil

• Washes them downstream

Multiple Choice

Of the substrates that we studied in class, this substrate is the smallest in particle size.

• boulders

• cobble

• sand

• silt

Multiple Choice

The abiotic feature most important to photosynthesis would be the

• Light

• Current

• Substrate

• Temperature

Multiple Choice

Heat in a river or stream comes from an increase in

• Current

• Substrate

• Chemicals

• Light

Multiple Choice

Braided channels in a river or stream are caused by

• Beavers

• Temperature Changes

• Boats

• Islands

Multiple Choice

The organisms in a river or lake that require a lot of light include

• Algae and Plants

• Insects and Snails

• Worms and Clams

• Fish and Frogs

Multiple Choice

River and lake animals rely heavily on the chemical ______ for respiration.

• Carbon Dioxide

• Oxygen

• Nitrogen

• Phosphorus

Multiple Choice

Measurements of chemicals in the water is usually done using the units...

• grams

• volume

• ppm

• pounds per acre

Multiple Choice

The amount of oxygen and carbon dioxide that dissolve into the water is controlled by

• Light

• Substrate

• Temperature

• Number of Plants

Multiple Choice

Turbulence in the water will have the greatest impact on the ________ of the waterway.

• Substrate

• Light

• Temperature

• Current

Multiple Choice

Current is influenced by many factors. Choose a factor that would increase the velocity of the current in the stream.

• Increasing the number of sand bars and deep pools in a channel

• Decreasing the steepness of the slope of the channel

• Having an increase in the amount of water in a channel

• Increasing the temperature of the water in a channel

Multiple Choice

Which chemical factor would be required for organisms to produce proteins?

• Silica

• Nitrogen (nitrates & Nitrites)

• Phosphorus (Phosphates)

• Oxygen

Multiple Choice

Which of the following would NOT have a large influence on temperature of a stream?

• air temperature

• amount of shade

• mixing of surface water and deep water

• number of organisms in the stream

Multiple Choice

Which description best describes a factor that affects light called aspect?

• extreme latitudes receive 6 months of sunlight and 6 months of darkness, while the equator receives roughly 12 hours of sunlight and darkness each day

• angle of incidence at which light strikes the surface of the water

• For every one thousand meters above sea level, average temperature drops by one degree Celsius

Multiple Choice

Choose the best description of the relationship between wind and waves.

• The stronger the wind, the higher the waves.

• The stronger the wind, the weaker the waves

• Wind does not have a strong relationship with wave size.

Multiple Choice

Which process would not supply oxygen in a lake?

• respiration

• photosynthesis

• turbulent water

Multiple Choice

Using your chart on Depth of Wave Mixing, what would the depth of wave mixing be for a lake with a 6,000 ft fetch in strong breeze (26 mile per hour winds)

• 11.0

• 12.2

• 13.3

• 15.2

Multiple Choice

In the same lake (fetch distance 6000ft), what would the minimum wind speed required to ensure substrate resuspension if the average depth of the lake is 11 feet.

• 20 miles per hour

• 22 miles per hour

• 24 miles per hour

Multiple Choice

Which factor would have the least impact on current in a stream?

• gravity

• river bed's topography (rocks, dams, etc)

• steepness of river bottom

• substrates of stream bottom