Exam 15: Ecosystems, Biomes, and Cycles of Life

At what trophic level would you find carnivores (meat eaters)?

Which of the following biomes receives the least amount of precipitation?

Bacteria drives which of the following cycles?

Those heterotrophs who eat only plants are termed

The atmosphere has had a great influence on the biosphere and has, in turn, been deeply affected by the biosphere over Earth's history.

Soil __________ is a measure of the "clumpiness" of the soil.

Soil contains __________ , partially decayed organic matter.

Which of the ecosystems listed below has the greatest biomass?

The carbon, nitrogen, and phosphorus cycles are three of the least important biogeochemical cycles.

Of the following, which is not a biome?

The boundaries between biomes are typically

Heterotrophs, the primary producers, are the first trophic level.

In its most general form, a __________ cycle is the complete pathway that a chemical element follows through the Earth system.

The production of body mass by heterotrophs is called ___________ production.

In a typical soil profile, the A Horizon is

Different elements generally take the same pathways through the four great reservoirs of the Earth system.

Which biome is characterized by heavy precipitation, giant trees, and a large diversity of organisms?

When there are several interconnected food chains in an ecosystem that involves complex eating relationships and interactions, we call it a __________ web.

___________ is a measure of how easily a substance can be absorbed and used by organisms.

What elements -- beneficial or harmful -- enter the human body from soils, by the way of the food crops that we consume? What are the pathways of these substances?