Biology Unit 3 Ecology Test 2024-2025

Front

What are organisms that have major impacts on the ecosystem they live in?

Back

Keystone species are organisms that have a disproportionately large effect on their environment relative to their abundance.

Front

What percent of energy is transferred from one trophic level to the next in an energy pyramid?

Back

10% of energy is transferred from one trophic level to the next in an energy pyramid.

Front

What is the role of bacteria in the nitrogen cycle?

Back

Bacteria take nitrogen from the atmosphere into the soil and send it back into the atmosphere.

Front

What are the nonliving factors in an ecosystem called?

Back

Abiotic factors are the nonliving components of an ecosystem.

Front

What is the term for the variety of living organisms in an ecosystem?

Back

Biodiversity refers to the variety of living organisms in an ecosystem.

Front

What is the primary role of primary consumers in an ecosystem?

Back

Primary consumers are organisms that eat producers (plants) and are the second trophic level in the food chain.

Front

What are invasive species?

Back

Invasive species are non-native organisms that spread widely in a new habitat and can cause harm to the ecosystem.

Front

What is the difference between biotic and abiotic factors?

Back

Biotic factors are living components of an ecosystem, while abiotic factors are nonliving components.

Front

What is an example of a keystone species?

Back

Sea otters are an example of a keystone species because they help maintain the balance of kelp forest ecosystems.

Front

What is the significance of biodiversity in an ecosystem?

Back

Biodiversity contributes to ecosystem resilience, productivity, and stability.