Element Cycles and Symbiotic Relationships

Yucca flowers are pollinated by yucca moths. The moths lay their eggs in the flowers and the eggs hatch. The larvae eat some of the seeds, and spread them around. Both species are benefited.

• mutualism

• commensalism

• parasitism

Tags

NGSS.MS-LS2-2

A bison walks through the grass, insects fly up and are seen and eaten by egrets. This neither harms nor helps the bison, but it is easier for the egrets to get food.

• mutualism

• parasitism

• commensalism

Hermit crabs live in shells that snails don't use anymore. The hermit crab gets a nice free home. This neither harms nor helps the snails.

• mutualism

• commensalism

• parasitism

Birds build nests out of dead twigs and leaves. They build their nests in living trees. This doesn't hurt the tree.

• mutualism

• commensalism

• parasitism

A tapeworm lives in the intestines of a dog. It absorbs food the dog has eaten and grows larger in the process. The dog becomes weaker from malnutrition. What type of symbiotic relationship is this?

• mutualism

• commensalism

• parasitism

• predation

Which symbols best describe mutualism?

• +,+

• +,-

• +,0

• -,0

Which symbols best describe commensalism?

• +,+

• +,-

• +0

• 0,0

Tags

NGSS.MS-LS2-2

Bromeliads and trees are in a commensal relationship because: (choose 2)

• the tree provides shelter and an environment for the bromeliad

• the tree is harmed from the bromeliad taking food from it

• the tree is not harmed or helped by the bromeliad

• the tree takes nutrients from the bromeliad

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following best describes a difference between a mutualistic relationship and a parasitic relationship?

• Parasitism harms both organisms, while mutualism harms only one organism.

• Parasitism benefits only one organism, while mutualism benefits both organisms.

• Parasitism involves only two organisms, while mutualism involves many organisms.

• Parasitism continues for many generations, while mutualism is limited to one generation.

A relationship between two organisms in which one is benefited and the other is harmed.

• Mutualism

• Commensalism

• Parasitism