APES 1.9, 1.10, & 1.11

The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.
• It shows how sunlight flows within an ecosystem.
• They show what direction the energy is flowing between organisms. 
• They represent how water is transferred within a habitat.

What is the primary source of energy for most ecosystems?

• Wind energy

• Geothermal energy

• Sunlight

• Tidal energy

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Which process is responsible for converting solar energy into chemical energy in ecosystems?

• Photosynthesis

• Respiration

• Decomposition

• Evaporation

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NGSS.MS-LS1-6

How do biogeochemical cycles contribute to ecosystem stability?

• By providing a constant supply of nutrients

• By increasing the amount of sunlight available

• By reducing the need for energy flow

• By eliminating all waste products

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What role do producers play in the energy flow of an ecosystem?

• They consume energy from higher trophic levels.

• They convert solar energy into chemical energy.

• They decompose organic matter.

• They store energy in the form of heat.

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NGSS.MS-LS2-3

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Which of the following best describes a trophic level?

• A group of organisms that share the same habitat.

• A step in the food chain where organisms obtain energy.

• A classification of organisms based on their size.

• A measure of the biodiversity in an ecosystem.

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In a food web, what happens to energy as it moves up trophic levels?

• Energy increases at each level.

• Energy remains constant at each level.

• Energy decreases at each level.

• Energy is recycled back to the producers.

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What is the 10% rule in the context of energy transfer in ecosystems?

• Only 10% of energy is lost at each trophic level.

• Only 10% of energy is transferred to the next trophic level.

• 10% of organisms survive at each trophic level.

• 10% of energy is recycled back to the producers.

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NGSS.MS-LS2-3

Why is energy transfer between trophic levels inefficient?

• Energy is lost as heat during metabolic processes.

• Energy is completely converted into biomass.

• Energy is stored indefinitely in organisms.

• Energy is transferred without any loss.

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NGSS.MS-LS2-3

Which trophic level typically receives the least amount of energy?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

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