Symbiotic Relationships

There are four main symbiotic relationships.

​Mutualism

​Parasitic

Commensalistic

Competitive

Parasitic Relationship

​A parasitic relationship is one in which one organism, the parasite, lives off of another organism, the host, harming it and possibly causing death.

Commensalistic relationship

​A commensalistic relationship is one in which one organism benefits and the other derives neither benefit nor harm.

competitive relationship

a competitive relationship occurs when two organisms compete for the same limited resource. The resource may be biotic or abiotic.

Mutualistic relationship

​a mutualistic relationship occurs when organisms of two different species each benefit.

Multiple Choice

What symbiotic relationship occurs between squirrels and trees?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between round worms and dogs?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between cheetahs and lions?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between humans and mosquitoes?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between bees and flowers?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between humans and "gut" bacteria?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive

Multiple Choice

What symbiotic relationship occurs between a whale and a barnacle?

• Mutualistic

• Parasitic

• Commensalistic

• Competitive