Food web/ Food Chain in ecosystems

Dylan drew a diagram showing that certain organisms eat other organisms. The diagram included a caption stating that the amount of available energy decreases with each organism that is eaten. How is this explained by the law of conservation of energy?

• Living things change energy into matter.

• Some of the energy is used for life processes.

• Some energy disappears when living things are eaten.

• Only small amounts of energy can be destroyed at a time.

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Which of the following is the name given to organisms that make their own food?

• autotrophs

• heterotrophs

• decomposers

• omnivores

What do the arrows in the food chain indicate about the flow of energy in an ecosystem?

• Energy is continuously recycled by the organisms in an ecosystem.

• Energy flows in one direction in an ecosystem, from producers to consumers.

• More of the available energy in an ecosystem is given to large animals than to small animals.

• Organisms at the end of the food chain receive more energy than those at the beginning.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

In this energy pyramid, which organism would most likely be in level 2?

• bird

• fox

• caterpillar

• tree

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NGSS.MS-LS2-3

How would the removal of earthworms from the food chain affect the other organisms?

• The number of bass will increase.

• The number of crayfish will decrease.

• The crayfish will get their energy directly from the sun.

• The number of bass and ospreys (bird) will increase.

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Interactions in an ecosystem result from the transfer of matter and energy from producers to consumers and eventually decomposers. What are the forms of energy transfer from numbers 1 through 4?

• Chemical energy to chemical energy

• Light energy to chemical energy

• Chemical energy to heat energy

• Heat energy to mechanical energy

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Suppose that a new predator of the rabbit migrated to this ecosystem. What is the most likely initial effect on the other organisms?

• More competition among the mice for food

• More competition among the hawks for food

• Less competition among snakes for food

• Less grass available for food

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The picture shows an energy pyramid. What will most likely happen to the foxes and the wolves if the rabbits are removed?

• The foxes will eat more wolves.

• The foxes will eat fewer wolves.

• There will be more foxes and wolves.

• There will be fewer foxes and wolves.

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NGSS.MS-LS2-1

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A student examines the information in the table. The student concludes that Organism W should be placed at the base of the food web to represent the feeding relationships in the marine ecosystem. However, the student later learns that Organism W's cells do not contain chloroplasts. Based on the new information, which conclusion would be appropriate?

• Another organism in the marine ecosystem is a producer.

• Organism W is a secondary consumer in the marine ecosystem.

• The role of Organism T in the marine ecosystem changes during its life.

• This marine ecosystem does not have any producers.

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NGSS.MS-LS1-6

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The diagram provided shows a simple food web. Which group of organisms is not represented in the diagram?

• prey

• decomposers

• consumers

• producers

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