Parasitism, Mutualism, or Commensalism?
Read about each relationship and decide which type of symbiosis is being described:
1. shrimp and sea anemone The shrimp is immune to the stinging
tentacles of the sea anemone. By
hiding in the sea anemone, the
shrimp is protected from predators.
2. green alga and fungus (lichen) A green alga and fungus are
dependent on each other. The fungus
gains nutrients synthesized from the
alga, and the alga receives water
and nutrient salts from the fungus.
3. rhizobium bacteria and The bacteria found on the roots of a
soybean plant fix atmospheric
nitrogen and make it available to the
plant. The bacteria receives
carbohydrates from the plant.
4. hermit crab and sea anemone The hermit crab is less likely to be
eaten by cuttlefish when an
anemone rides on its shell. The
anemone gains access to a wider
5. oxpecker bird and The oxpecker bird eats ticks living
on the hippopotamus's back.
6. tapeworm and dog The tapeworm attaches to the
intestinal wall of the dog and takes
nutrients consumed by the dog.
7. crocodile and Egyptian plover The Egyptian plover feeds on
leeches and other scraps of food in
the crocodile's mouth. The crocodile
benefits because the plover cleans
8. ant and acacia tree The ant burrows into a thorn of the
acacia tree to live and eat sugar
secreted by the tree. The ants benefit
the tree by attacking predators.
9. cleaner fish and shark The cleaner fish feeds on parasites
in the shark's mouth and gills.
10. tick and cow The tick burrows into the cow's skin
to suck blood.