Ecology and Ecosystem Interactions Worksheet

Some eucalyptus trees have mistletoes plants living on them. Mistletoe has very similar leaves to eucalyptus leaves. Mistletoe can make their own food, but their stems send suckers into the eucalyptus tree to obtain water and minerals. If too much water and minerals are removed, the eucalyptus tree can die. This is an example of:

• parasitism

• mutualism

• commensalism

• predation

Which of the following is an example of an abiotic factor in an ecosystem?

• A predator hunting its prey

• A tree providing shelter for animals

• The temperature of the environment

• A population of rabbits competing for food

Grizzly bears feast on salmon in the spring months after the winter thaw. Grizzly bears often fight among themselves for prime fishing spot during the salmon spawning season. This is an example of:

• interspecific competition

• intraspecific competition

• parasitism

• mutualism

What is the most appropriate sampling method that should be used to determine the size of a dandelion population in a public park?

• Quadrats

• Capture-recapture

• Complete count

• Total count

Which type of relationship benefits both organisms involved?

• Parasitism

• Commensalism

• Mutualism

• Competition

In a parasitic relationship, what happens to the host organism?

• It benefits

• It is harmed

• It is unaffected

• It dies immediately

What is the main characteristic of commensalism?

• Both organisms benefit

• One benefits, the other is harmed

• One benefits, the other is unaffected

• Both are harmed

Which of the following is NOT a type of relationship shown in the table?

• Mutualism

• Commensalism

• Parasitism

• Predation

In mutualism, what is the effect on organism 1 and organism 2?

• Both are harmed

• Both benefit

• One benefits, one is harmed

• One benefits, one is unaffected

Which relationship involves one organism benefiting and the other being harmed?

• Mutualism

• Commensalism

• Parasitism

• Competition