U4CH1 Review

In a food chain, the organism that eats both plant and animal matter is called a

• omnivore

• carnivore

• herbivore

• producer

The function of decomposers in a food web is to

• return nutrients to the soil for use by producers

• return energy to the air for use by producers

• increase the energy supply of the ecosystem

• decrease the biomass in the ecosystem

A system that removes more carbon dioxide from the atmosphere than it releases into the atmosphere is known as a

• carbon source

• carbon sink

• biotic factor

• geochemical cycle

An ecosystem includes

• abiotic components only

• biotic components only

• physiographic components only

• both biotic and abiotic components

A rapid algal bloom can harm an aquatic ecosystem because

• algae deplete the oxygen in the water

• decomposing dead algae deplete the oxygen in the water

• an extensive algae bloom blocks the sunlight for other organisms in the water

• all of the above

A honey bee helps to pollinate flowers while it is collecting nectar from the flower. This relationship is an example of

• commensalism

• mutualism

• parasitism

• predation

A tapeworm lives in the intestines of an animal and absorbs nourishment from its host. If the tapeworm multiplies enough, eventually the host becomes weak and may die of some contracted disease. This relationship is an example of

• commensalism

• mutualism

• parasitism

• predation

A barnacle grows on a whale, doing it no harm. This is an example of

• commensalism

• mutualism

• parasitism

• predation

An example of a biotic factor in an aquatic ecosystem is

• a pH of soil equal to 6.5

• a water temperature equal to 13.5⁰C

• the presence of coyote tracks

• the presence of white stem pondweed

A growing forest is valuable because it

• removes carbon dioxide from the atmosphere

• releases carbon dioxide into the atmosphere

• removes methane from the atmosphere

• uses oxygen from the atmosphere