Exploring Ecosystems and Relationships

What is a food chain?

• A series of organisms each dependent on the next as a source of food

• A network of interconnected food chains

• A diagram showing the energy flow in an ecosystem

• A type of symbiotic relationship

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What is the primary source of energy for most ecosystems?

• Water

• Sunlight

• Wind

• Soil

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Describe the role of producers in a food chain.

• They decompose organic material

• They consume other organisms

• They convert solar energy into chemical energy

• They provide shelter for animals

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NGSS.MS-LS2-3

Which of the following best describes a food web?

• A linear sequence of organisms

• A complex network of interconnected food chains

• A pyramid showing energy levels

• A diagram of symbiotic relationships

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

• A food chain is more complex than a food web

• A food web includes multiple food chains

• A food chain includes multiple food webs

• A food web is linear, while a food chain is not

Identify the trophic level of herbivores in a food chain.

• Primary producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

Which type of ecological pyramid shows the number of organisms at each trophic level?

• Pyramid of energy

• Pyramid of biomass

• Pyramid of numbers

• Pyramid of productivity

What is the significance of decomposers in a food web?

• They produce energy for the ecosystem

• They break down dead organisms, returning nutrients to the soil

• They are primary consumers

• They are at the top of the food chain

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How does energy efficiency affect the shape of an ecological pyramid?

• Energy efficiency increases the height of the pyramid

• Energy efficiency decreases the width of the pyramid

• Energy is lost at each trophic level, resulting in a pyramid shape

• Energy efficiency has no effect on the pyramid shape

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What is the role of apex predators in a food web?

• They produce energy for the ecosystem

• They control the population of other species

• They are primary producers

• They decompose organic material

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NGSS.MS-LS2-2