Food Webs

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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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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The diagram shows part of an aquatic food web for a stable lake ecosystem in Connecticut. What is the source of energy for the algae?

• waves

• sunlight

• bacteria

• rotifers, water fleas and tadpoles

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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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For the food chain shown, which of the following changes would have the most severe consequences?

• a drastic decrease in rainfall, causing a drought

• the poaching of predatory hawks by game hunters

• the introduction of a second predator that eats field mice

• a parasitic infestation that reduces the cricket population

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NGSS.MS-LS2-1

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The diagram provided shows a marine food chain. In this food chain, the zooplankton are

• primary producers.

• primary consumers.

• secondary consumers.

• tertiary consumers.

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NGSS.MS-LS2-3

The picture provided shows an ocean bay food chain. Sea otters move into the ocean bay. They eat all of the sea urchins. This change will cause the

• kelp to have less food.

• crabs to have more food.

• sea ducks to have less food.

• arctic foxes to have more 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 chemical pesticide was applied to an area of this ecosystem by a landowner to control the mouse population. There was a decrease in the mouse population due to the presence of this pesticide. Which one of the following would most likely occur due to this change in the ecosystem?

• The amount of grass would decrease.

• The snake population would increase.

• The rabbit food supply would increase.

• The snake food supply would increase.

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NGSS.MS-LS2-1

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