G7 Chapter 7 Ecology Beginning

More usable nitrogen compounds would build up in soils causing too much growth of different plants.

All nitrogen gas would stay in the atmosphere.

Plants and animals would not get the nitrogen compounds they need to survive.

Ecosystems would have too many usable nitrogen compounds, causing increased growth of animal populations.

Energy is generated at each level.

An equal amount of energy is available at each level.

Most of the energy at a trophic level passes to the next level.

A small amount of the energy at trophic level is passed to the next level.

increasing evaporation rates

decreasing precipitation

stabilizing water levels

having no effect

moves nutrients from soil to the atmosphere

returns only carbon to the soil

breaks down dead organisms to return nitrogen back to the atmosphere

returns nutrients and matter to the soil

A) Matter and energy cycle through ecosystems.

B) Energy flows through ecosystems and matter cycles through ecosystems.

C) Energy cycles through ecosystems and matter flows through ecosystems.

D) Energy and matter flow through ecosystems.

Less energy is generated by the organisms in higher trophic levels.

Some energy at each level is destroyed and cannot be passed to other organisms.

Energy used for body processes are given off as heat and is not passed to other organisms in a usable form.

The organisms at each level are less efficient at using energy than those in the previous levels.

Producers have more available energy than third-level consumers.

Third-level consumers have more available energy than first-level consumers.

First-level consumers have less available energy than second-level consumers.

Second-level consumers have less available energy than first-level consumers.

highest

lowest

moderate

least

frog → owl → mouse

grasses → mouse → hawk

grasses → rabbit → fox → owl

hawk → snake → bird → grasshopper → grass