Organisms and Environments Pre-Test

Increasing which of the following will result in an increase in competition among members of a population of a species living in the same habitat?

• Size of the habitat

• population density

• rate of disease

• food supply

The greatest competition would most likely occur if which of the following organisms were to decrease?

• mice and pangolins

• red oat grass and warthogs

• grasshoppers and impalas

• mongoose and lions

Penguins that are able to survive the extremely harsh winters in the icy lands of Antarctica do so by huddling together in tightly packed groups. They do this because they are depending on each other to meet their need for a certain –

• nutritional requirement

• quantity of fresh water

• range of temperatures

• duration of sunlight

Based on the table, native organisms will be negatively affected by competition with cane toads if they –

• eat reptiles

• hunt from the air

• live in the water

• are longer than 15 cm

Which statement below is an example of organisms providing resources in an ecosystem that others depend on?

• trees growing toward sunlight in a forest

• baboons stealing each others' food

• lizards fighting for the warmest rock

• earthworms enriching and aerating soil

Bromeliads do this because they are in competition with other plants for -

• soil

• heat

• light

• water

Fish in a small pond will most likely depend on which of the following biotic factors to meet their needs?

• Plants that exchange gases with the pond water.

• Insects that feed on other insects in the pond.

• Water birds that prey on amphibians and small fish.

• Large predators that consume aquatic vertebrates.

Based on the diagram, which two organisms compete for food resources?

• Hawks and coyotes

• coyotes and mountain lions

• squirrels and hawks

• mountain lions and antelopes

Prairie dogs are small mammals. They are primarily herbivores that live in underground burrows in grassland prairie ecosystems. Prairie dogs depend on burrows for –

• sunlight

• water

• protection

• food

Graphs are provided showing how two factors changed over time in a certain region: the number of animals that preyed on mice and the amount of plants the mice ate. Using the information from these graphs, predict which of the following years will see the highest increase in mouse population.

• 1996

• 1998

• 2000

• 2002