Energy and Ecosystems Quiz

What is the primary source of energy for ecosystems?

• Volcanoes

• The Moon

• The Sun

• Ocean currents

In the tundra food chain, what role do caribou play?

• Producers

• Decomposers

• First-level consumers

• Second-level consumers

What is the role of scavengers in a food chain?

• They are top predators

• They decompose organic matter

• They consume dead organisms

• They produce energy from sunlight

Which organisms are responsible for breaking down dead plants and animals?

• First-level consumers

• Producers

• Second-level consumers

• Decomposers

What happens if a predator is removed from a food web?

• The ecosystem remains unchanged

• The number of prey increases

• New predators immediately appear

• The number of prey decreases

How do food webs differ from food chains?

• Food webs do not include decomposers

• Food webs show multiple interconnected paths

• Food webs are simpler than food chains

• Food webs show a single path of energy flow

In an energy pyramid, which level has the most energy available?

• First-level consumers

• Producers

• Second-level consumers

• Top-level consumers

What might happen to the krill population if salmon numbers decrease?

• Krill become extinct

• Krill numbers increase

• Krill numbers decrease

• Krill numbers remain the same

Which of the following is a second-level consumer in an ocean energy pyramid?

• Leopard seals

• Octopuses

• Krill

• Phytoplankton

What percentage of energy is typically passed from one level to the next in an energy pyramid?

• 1%

• 100%

• 10%

• 50%