6B: Biogeochemical Cycles

Multiple Choice

What is the process during which water changes from a liquid to a gas as it heats up?

• Condensation

• Runoff

• Precipitation

• Evaporation

Multiple Choice

What is the process during which water cools and turns from a gas to a liquid?

• Condensation

• Transpiration

• Precipitation

• Evaporation

Multiple Choice

True or False: Evaporation is caused by the sun's heat.

• True

• False

Multiple Choice

What step of the water cycle does #2 show? (use this photo!)

• Evaporation

• Condensation

• Groundwater

• Runoff

Multiple Choice

What is the process that gets carbon from the atmosphere to plants called?

• photosynthesis

• cellular respiration

• eruption

• dissolved into it

Multiple Choice

What is the process that gets carbon from plants to animals called?

• consumption (eating)

• cellular respiration

• melting

• dissolved into it

Multiple Choice

Burning fossil fuels has raised the concentration of ___________ in the atmosphere.

• oxygen

• rain

• carbon

• nitrogen

Multiple Choice

Combustion is another word for _______________.

• a train
• a bus
• a dog
• burning

Multiple Choice

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

Multiple Choice

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

Multiple Choice

Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of

• mutualism
• parasitism
• commensalism
• competition

Multiple Choice

How nitrogen is "fixed" into useable form for plants

• only through action of bacteria
• only through lightning
• through action of bacteria & lightning
• through photosynthesis

Multiple Choice

How plants get the nitrogen they need

• from the air
• from the soil or water in which they live
• from the Sun
• from broken down rocks

Multiple Choice

Which organisms involved in the nitrogen cycle convert nitrogen gas into nitrogen compounds in the soil?

• Decomposers

• Nitrifying bacteria

• Denitrifying bacteria

• Nitrogen-fixing bacteria

Multiple Choice

Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria
• plants
• animals
• producers

Multiple Choice

The picture shows root nodules on a pea plant. Those root nodules are colonized by nitrogen-fixing bacteria.

The relationship between the bacteria and the pea plant is described as mutualistic; what does this mean?

• Both the bacteria and the pea plant benefit from this relationship.

• The pea plant benefits from the relationship, but the bacteria do not.

• The bacteria benefit from the relationship, but the pea plant does not.

• Neither the bacteria nor the pea plant benefits from this relationship.

Multiple Choice

How are animals able to absorb phosphorus?

• by eating and drinking

• By absorbing it through soil

Multiple Choice

How do plants obtain phosphorus?

• Absorbing it from gas in the air

• Absorbing from the soil

Multiple Choice

True/False. Weathering breaks down rocks which allows phosphorus to be moved into soil and water.

• true

• false