TEKS B.12(C) - Flow of Energy

A partial Texas food web is shown.

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

• grasses and ants

• ants and grasshoppers

• grasshoppers and texas cottonmouths

• texas cottonmouths and red-shouldered hawks

A biomass pyramid of an ecosystem is shown.

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.

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

A partial meadow food web is shown.

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

The energy pyramid below 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