Symbiosis, Competition and Predation

Which situation best represents a mutualistic relationship?

• A tapeworm absorbing nutrients from the intestine of a dog

• An orchid being pollinated by a nectar collecting wasp

• A human losing blood to a feeding mosquito

• An armadillo rooting in the soil at the base of an oak tree

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NGSS.MS-LS2-2

Which of these best describes the relationship

between epiphytes and trees?

• Parasitism

• Migration

• Commensalism

• Predation

A hummingbird feeds on the nectar of a flowering plant. In this process the bird gains nutrition while spreading the plant’s pollen to other flowers. The relationship between hummingbirds and flowering plants can be described as —

• commensal

• predatory

• parasitic

• mutualistic

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

A tick feeding on the blood of a dog is an example of —

• commensalism

• parasitism

• mutualism

• predation

Beechdrops (Epifagus virginiana) are leafless plants that lack chlorophyll. Beechdrops get their nourishment from the roots of beech trees, which reduces the amount of nutrients available to the trees themselves. This interaction is best described as —

• predatory

• parasitic

• commensalistic

• mutualistic

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NGSS.MS-LS2-1

Which of these is the best example of a mutualistic relationship in an aquatic environment?

• Some fish can survive repeated infections by harmful bacteria.

• Some fish have bacteria living in their digestive tract that help the fish digest food.

• Some bacteria are present in aquatic food chains in which fish are secondary consumers.

• Some bacteria are aquatic decomposers that recycle nutrients useful to fish.

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NGSS.MS-LS2-2

An oakworm caterpillar feeds on the leaves of an oak tree. This type of interaction is —

• mutualistic

• parasitic

• commensalistic

• competitive

Which of these best represents a mutualistic relationship?

• Bull snake/mouse

• White-tailed deer/grass

• Hummingbird/blossom

• Spadefoot toad/cricket

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NGSS.MS-LS2-2

This relationship is an example of —

• parasitism

• mutualism

• predation

• commensalism

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NGSS.MS-LS2-2

Which of the following is an example of mutualism?

• A wasp injects its eggs inside the body of a caterpillar. The eggs hatch and eat the caterpillar.

• A bird builds a nest in a tree.

• A human uses a dog to protect a flock of sheep. The dog is given food and shelter.

• A flower grows next to a bush.

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NGSS.MS-LS2-2