Exam 31: The Dynamics of Communities and Ecosystems

_______ is a fuel formed from wetland biomass that accumulates under standing water.

Which of the following is not a primary producer?

An aquatic ecosystem is more likely to have an inverted pyramid of biomass than a terrestrial ecosystem.

An example of allelopathy is the inability of weeds to grow near sorghum plants.

Secondary metabolites are chemicals produced by plants that deter insect herbivores.

After a glacier recedes, _____ are often the first to become established on the bare rock.

_______ would be found at the base of a pyramid of energy.

In the chalk grasslands of England, what happened to the plants when a viral disease reduced the rabbit population?

In the northern Rocky Mountains, seedlings of Engelmann spruce outcompete seedlings of subalpine fir in sunny locations because the spruce:

Which of the following statements about an upright pyramid of energy is FALSE?

The biosphere consists of all the Earth's:

The Gaia hypothesis suggests that the biosphere functions as an organismal system.

An example of a community is an oak tree and all the organisms that live in and on it.

The ants of genus Pseudomyrmex that swarm over a bull's-horn acacia tree:

Many species are members of more than one trophic level.

In general, ______ percent of the incident light is incorporated into plant biomass.

An example of mutualism is nitrogen-fixing bacteria growing in the root nodules of legumes.

______ produced by plants are the most important factors preventing attack by herbivorous insects.

Mutualism is an interaction between two species in which:

All chemosynthesizers are microbial.