Ecology Review

Which animals in the community would be classified as herbivores?

• snakes

• hawks

• spiders

• grasshoppers

Decomposition and decay of organic matter are accomplished by the action of

• green plants

• bacteria and fungi

• viruses and algae

• scavengers

Which type of model provides the most complete representation of the feeding relationships within a community?

• a material cycle

• a predator-prey association

• a food chain

• a food web

Which change would most likely reduce the population size of the carnivorous fish?

• an increase in the autotroph populations

• a decrease in the duck population

• an increase in the raccoon population

• a decrease in pathogens of carnivorous fish

If the population of mice is reduced by disease, which change will most likely occur in the food web?

• The cricket population will increase.

• The snake population will increase.

• The grasses will decrease.

• The deer population will decrease.

What is the original source of energy for this food web?

• chemical bonds in sugar molecules

• enzymatic reactions

• the Sun

• chemical reactions of bacteria

A partial food web is represented in the diagram below. Letter X most likely represents:

• autotrophs

• carnivores

• decomposers

• parasites

Which organism carries out autotrophic nutrition?

• hawk

• cricket

• grass

• deer

In most habitats, the removal of predators will have the most immediate impact on a population of

• producers

• decomposers

• herbivores

• microbes

The graph below shows changes in the populations of two species that interact only with each other over a period of time. Which statement best describes these two species?

• Species A is a producer and species B is its consumer.

• Species A is a host and species B is its parasite.

• Species A is a predator and species B is its prey.

• Species A is a scavenger and species B is its decomposer.