Flow of Energy in an Ecosystem

An organism that lives by breaking down dead organic matter into simpler parts is a _______________________.

• scavenger

• consumer

• decomposer

• carnivore

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The direction of an arrow in a food chain represents

• the flow of energy from organism B to A

• the movement of organisms

• the directionality of the sun

• the flow of energy from organism A to B

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Name the producers in this food web.

• seagull and fish

• penguin and crab

• phytoplankton and seaweed

• seaweed and zooplankton

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Energy is passed along the organisms in a food chain. What is the original source of the energy?

• decomposers

• consumers

• producers

• sun

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In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%

• 90%

• 10%

• 20%

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The diagram represents a model of a food pyramid.  Which statement best describes what happens in this food pyramid?

• More organisms die at higher levels than at lower levels, resulting in less mass at higher levels.

• Energy is lost to the environment at each level, so less mass can be supported at each higher level.

• When organisms die at higher levels, their remains sink to lower levels, increasing the mass of lower levels.

• Organisms decay at each level, and thus less mass can be supported at higher levels

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Is this a food chain, food web, and/or energy pyramid? Why is it what you say it is and why is it not the other designations?

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Why are photosynthesis and cellular respiration important to living organism?

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Which answer is a true statement? Use the food chain to answer the question.

• The mushrooms break down the mountain lion because it is a scavenger

• The mountain lion eats the deer and is a carnivore

• The plant is a producer and gives energy directly to the carnivore

• The deer is an omnivore because it eats only plants

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How is energy transferred throughout the food web?

(Choose the option that best answers the question.)

• Energy is transferred when one organism consumes another.

• Energy is transferred by consumers absorbing energy from the sun.

• Animals such as the lion and jackal get energy by consuming producers.

• Organisms such as the mouse and owl pass energy to the producers.

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