Mutualism

Symbiosis

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Symbiosis

In nature, organisms interact with each other in a variety of ways. Some are predators, some are prey, and some just compete for food against each other. Some of these relationships last a long time while others do not. In nature a relationship between two organisms that last a long time is called symbiosis. There are different kinds of symbiosis.

Multiple Choice

In nature a relationship between two organisms that last a long time is called ...

• parasitism

• symbiosis

• mutualism

Mutualism

When a relationship between two kinds of organisms benefits both organisms, it is called mutualism. 

Open Ended

I want you to think of an example of mutualism and write your answer here. A relationship where both organisms benefit and no one is harmed.

Parasitism

When two organisms form a relationship where one organism lives on or in another organism and may harm the other in the process it is called parasitism. The organism that lives on or in the other is called a parasite. The organisms they feed on both are called hosts. The parasites benefits from the relationship. The hosts are harmed by the relationship.

Multiple Choice

In parasitism....The organism that lives on or in the other is called a parasite. The organisms they feed on both are called hosts.

• True

• False

Commensalism

The relationship between two organisms where one benefits from the other while causing no harm in the process is called commensalism. Example-a tropical fish lives unharmed among the poisonous tentacles of a sea creature. The sea creature provides safety for the fish and the fish neither harms nor helps the creature. The fish becomes protected from other predators by the poison, yet provides nothing to the sea creature.

Open Ended

In your own words, explain commensalism

Multiple Select

Choose all the symbiotic relationships below.

• communism

• parasitism

• commensalism

• mutualism