Symbiosis bellringer

Two interactions between organisms are shown in the table above. X and Y do not represent the same organisms in the two interactions.

Which statement best describes the relationship between organism X and organism Y in each interaction?

• Organism X is positively affected and organism Y is negatively affected.

• Organism X is negatively affected and organism Y is positively affected.

• Both organisms are positively affected.

• Both organisms are negatively affected.

The crab Lybia tessellata carries a pair of sea anemones on its claws. The crab uses the sea anemone’s stinging tentacles as protection and the sea anemone obtains small food particles released by the crab as it feeds. Which type of symbiotic relationship does this best illustrate?

• Commensalism

• Mutualism

• Parasitism

• Predation

Which of these best describes the relationship between epiphytes and trees?

• Parasitism

• Migration

• Commensalism

• Predation

Which of these is an example of mutualism?

• a dragonfly eating beetles

• algae and fungi providing food and shelter for each other

• a wasp laying its eggs inside a caterpillar

• a woodpecker drilling for insects in the bark of a tree

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

• Commenalsistic

• Mutualistic