Biology Unit 3 Ecology Test 2024-2025

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What is biodiversity?

Back

Biodiversity refers to the variety of living organisms in an ecosystem, including the diversity of species, genetic variation, and ecosystem diversity.

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What are keystone species?

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Keystone species are organisms that have a disproportionately large impact on their ecosystem relative to their abundance. Their presence or absence can significantly affect the structure and health of the ecosystem.

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What are biotic factors?

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Biotic factors are the living components of an ecosystem, such as plants, animals, fungi, and microorganisms, that interact with each other and their environment.

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What role do bacteria play in the nitrogen cycle?

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Bacteria take nitrogen from the atmosphere into the soil through processes like nitrogen fixation and then return it back into the atmosphere through denitrification.

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What is the role of decomposers in the biogeochemical cycle?

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Decomposers recycle nutrients back into the ecosystem by breaking down dead organic matter, thus enriching the soil and making nutrients available for plants.

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What is an ecosystem?

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An ecosystem is a community of living organisms interacting with their physical environment, including both biotic and abiotic components.

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What are abiotic factors?

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Abiotic factors are the non-living components of an ecosystem, such as sunlight, temperature, water, soil, and air.

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What is the difference between primary consumers and secondary consumers?

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Primary consumers are herbivores that eat plants, while secondary consumers are carnivores that eat primary consumers.

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What is ecological succession?

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Ecological succession is the process by which ecosystems change and develop over time, often following a disturbance, leading to a new community structure.

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What is a food chain?

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A food chain is a linear sequence that shows how energy and nutrients flow from one organism to another in an ecosystem, starting from producers to various levels of consumers.