B.12(C) Food Webs

What would likely happen if mice were removed from the food web shown?

Which model best represents the amount of energy available for use at each trophic level represented in the food chain "Grasses → Grubs → Armadillos → Coyotes"?

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In a Central Texas grassland, the producers incorporate 12,000 kJ of energy from the sun into their tissues. About how much energy would be incorporated into the tissues of herbivores?

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(a)  

Which energy pyramid best models energy flow in the Texas Gulf Coast community?

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Based on the diagram, which two populations best represent trophic levels that receive the LEAST amount of the total energy provided to the ecosystem by the grass?

• Crickets and sparrows

• Toads and spiders

• Rabbits and mice

• Hognose snakes and owls

Based on this food web, which organism occupies multiple trophic levels?

• Canada goose

• Eastern cottontail

• Loggerhead sea turtle

• Sand dollar

The populations of which organisms will most likely increase as a result of a disease that suddenly reduced the population of Texas horned lizards?

• Ants

• Grasses

• Texas cottonmouths

• Red-shouldered hawks

• Grasshoppers

Which statement provides the best explanation for the difference in biomass of organisms found at each trophic level?

• Organisms at higher trophic levels have less energy available to them than organisms at lower trophic levels.

• Organisms at higher trophic levels require smaller habitats than organisms at lower trophic levels.

• Organisms at lower trophic levels provide less energy than organisms at higher trophic levels.

• Organisms at lower trophic levels outcompete organisms at higher trophic levels.

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

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