Ecosystem and Energy Quiz for 7th Grade

What defines an ecosystem?

• A single living organism
• A collection of only living things
• A natural area with living and non-living components that interact
• A place with only plants

Which component represents living organisms in an ecosystem?

• Abiotic components
• Biotic components
• Energy pyramid
• Food chain

What is the smallest unit of life in an ecosystem?

• Population
• Biological community
• Individual organism
• Species group

In a predation relationship, what happens to the prey?

• It benefits
• It is unaffected
• It is harmed or loses its life
• It gains energy

What characterizes a mutualistic relationship?

• One organism benefits, other is harmed
• Both organisms benefit
• One organism is unaffected
• Organisms compete for resources

Which organisms are considered producers?

• Lions
• Zebras
• Plants and algae
• Insects

What percentage of energy transfers between trophic levels?

• 50%
• 25%
• 10%
• 75%

What do primary consumers typically eat?

• Other carnivores
• Plants
• Dead organisms
• Top predators

In a commensalism relationship, what happens to the second organism?

• It is harmed
• It benefits
• It is unaffected
• It competes

What is the primary energy source for most ecosystems?

• Wind
• Water
• Sun
• Soil