Unit 2 Review: Energy and Matter in Ecosystems

How much energy is transferred from one trophic level to the next?

• 10%
• 25%
• 50%
• 90%

A graphic illustration that shows each trophic level and the amount of useable energy contained within.

• Food chain
• Food web
• Energy Pyramid
• All of these

An organism at the second trophic level would be considered a...

• Top carnivore
• Producer
• Herbivore
• Carnivore

Autotrophs make up the _______ level in all ecosystems.

• First
• Second
• Third
• Fourth

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

Organisms use nitrogen to form

• carbohydrates

• proteins and DNA

• lipids

• carbon dioxide

A particular golf course is using large amounts of nitrogen fertilizer. What process could move this nitrogen into a local stream?

• volatilization
• nitrogen fixation
• runoff
• ammonification

True or false. A decomposer can obtain energy from several trophic levels

• TRUE
• FALSE

Look at this pyramid. It is most likely to represent

• numbers
• biomass
• energy