Biology Unit 6 Review

What is the main way that nitrogen can become usable to plants?

• Denitrification

• Nitrogen-Fixing bacteria

• Combustion

• Respiration

How do ANIMALS obtain nitrogen?

• From nitrogen-fixing bacteria

• From the atmosphere

• From eating other organisms

• From decomposing

One possible option for the flow of energy in an ecosystem is represented by a...

• Food chain

• Food web

• Energy Pyramid

• Trophic Level

The carbon, phosphorous, nitrogen and water cycle are all critical in order to...

• Build protein

• Recycle nutrients

• Create new matter

• Destroy old matter

An energy source that is made of the carbon from long dead organisms that is stored long-term underground is known as...

• Water

• Decomposition

• Combustion

• Fossil Fuels

These numbers represent biomass. Which of these correctly describes the trend seen here?

• The northern pike are more numerous in this ecosystem than the perch.

• The freshwater shrimp have least biomass.

• There are more osprey in this ecosystem than anything else.

• There are less osprey than there are perch.

How much energy is available to the next trophic level in a biomass pyramid?

• 90%

• 10%

• 0%

• 100%

If the sun were removed from this ecosystem, what would occur?

• Green plants would increase.

• Only weasels would decrease.

• Hawks and owls would increase.

• Everything would die out

If herbivores increase in a food web, what would happen?

• A. Producers would decrease

• B. Carnivores would increase

• C. None of these

• Both A and B

If two animals share a food source and a habitat, which of these is most likely true?

• They are producers

• They are predators of each other

• They are in competition

• They are omnivores