Test Review 8.L.3 Populations & Ecosystems

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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.

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What is the role of producers in an ecosystem?

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Producers, such as plants, are organisms that can make their own food through photosynthesis, forming the base of the food chain and providing energy for consumers.

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What is the role of consumers in a food chain?

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Consumers are organisms that eat other organisms (plants or animals) to obtain energy. They can be classified as primary, secondary, or tertiary consumers based on their position in the food chain.

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What is the role of decomposers in an ecosystem?

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Decomposers, such as fungi and bacteria, break down dead organisms and waste, returning nutrients to the soil and making them available for producers.

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What is the difference between a food chain and a food web?

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A food chain is a simple, linear representation of energy flow, while a food web is a complex network of interconnected food chains showing how various organisms are related in an ecosystem.

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What is parasitism?

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Parasitism is a type of symbiotic relationship where one organism (the parasite) benefits at the expense of another organism (the host), which is harmed.

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What is mutualism?

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Mutualism is a symbiotic relationship where both organisms involved benefit from the interaction.

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What is commensalism?

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Commensalism is a type of symbiotic relationship where one organism benefits while the other is neither helped nor harmed.

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What is the predator-prey relationship?

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The predator-prey relationship is an interaction where one organism (the predator) hunts and eats another organism (the prey), affecting population dynamics in an ecosystem.

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What is an ecosystem?

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An ecosystem is a community of living organisms interacting with each other and their physical environment, including both biotic (living) and abiotic (non-living) components.