Unit 8

A stable ecosystem would not contain

• materials being cycled

• oxygen

• decomposers

• more consumers than producers

A forest fire destroyed a forest. For many years, only small plants could grow. Slowly, shrubs and trees began to grow. These changes are an example of

• manipulation of genes

• evolution of a species

• ecological succession

• equilibrium

Which of the following is not an example of a density-independent limiting factor?

• disease

• human activities

• severe weather

• natural disasters

A bird builds its nest in spiny plants like cacti to protect its young from predators such as the raven. The cacti are not helped nor harmed by these birds in any way. Which type of relationship does this demonstrate?

• commensalism

• parasitism

• mutualism

• predation

A serious threat to biodiversity is

• maintenance of food chains

• competition within a species

• a stable population size

• habitat destruction

Which of the following includes biotic and abiotic factors in an ecosystem as well as behaviors such as food eaten, temp. tolerated, time of day active, etc.

• habitat

• niche

• population

• community

Which of the following organisms does not carry out heterotrophic nutrition?

• bird

• mouse

• squirrel

• alga

The following observations were recorded: 2 wolves, 5 moose, large granite rock. These observations could be categorized as:

• population

• food chain

• community

• ecosystem

Which factor has the greatest influence on the type of ecosystem that will form in a particular geographic area?

• genetic variations in the animals

• climate conditions

• number of carnivores

• amount of nitrogen in the atmosphere

Sunlight, precipitation, and soil type are all examples of:

• biotic factors

• abiotic factors

• ecosystems

• logistic growth