Food Webs STAAR Questions

The table lists some organisms found in a swamp ecosystem and their sources of energy.

When constructing an energy pyramid of the swamp ecosystem, which of these would be placed at the top of the pyramid?

• grass carp

• American alligator

• Eastern mud turtle

• Great blue heron

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Based on this food web, which organisms are direct sources of energy for secondary consumers?

• Aphid, Bird, Rabbit

• Ladybug, Fox Dragonfly

• Frog, Butterfly, Berries

• Mouse, Snake, Hawk

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The energy pyramid shows the energy made available by producers. Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?

• 100 joules

• 500 joules

• 1,000 joules

• 50 joules

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The diagram shows a partial East Texas food web. Which table correctly classifies these organisms?

• 
• 
• 
• 

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The amount of energy the producers in this energy pyramid provide the primary consumers is 54,000 joules. From this amount, 540 joules are provided to the tertiary consumers.

Based on this model, how much of the energy was provided to the secondary consumers?

• 53,460J

• 5,400J

• 540J

• 54J

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NGSS.MS-LS2-3

Part of a hydrothermal vent food web is represented in the diagram. Which organisms are both secondary and tertiary consumers in this food web?

• chemosynthetic bacteria and amphipods

• zooplankton and mussels

• ratfish and octopuses

• galatheid crabs and zoarcid fish

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The food web shows the flow of energy through a sagebrush-steppe ecosystem. Which of these organisms are in a trophic level that receives a larger percentage of the energy captured by the producers than the percentage received at the bats' trophic level?

• mountain lion

• snakes

• hawks

• ground squirrels

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NGSS.MS-LS2-1

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A student is asked to draw a food web in which the same organism is a primary consumer as well as a secondary consumer. How should the organism be represented in the food web?

• the organism must have an arrow pointing from it to a tertiary consumer and another arrow pointing from it to a decomposer

• the organism must have an arrow pointing from it to a secondary consumer and another arrow pointing to it from the top predator

• the organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer

• the organism must have an arrow pointing from it to a primary consumer and another arrow pointing away from it to a decomposer

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A marine ecosystem is represented. What is lost to the environment at each of the trophic levels of this ecosystem?

• nutrients from the soil

• living space for the organisms

• food sources

• heat

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A terrestrial food web is shown. Which of the following lists only organisms that are secondary consumers in this food web?

• mice, rabbits, herbivorous insects, and squirrels

• predaceous insects, toads, spiders, and foxes

• spiders, foxes, owls, hawks, and snakes

• insectivorous birds, seed-eating birds, owls, and hawks

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