Question

Type of interaction Interaction between species 1 and species 2 Effect on species 1 Effect on species 2 Caterpillars (1) eat passionflower leaves (2). Weeds (1) grow among tomato plants (2) Honeybees (1) pollinate daisies (2) while feeding on their nectar and pollen competaon mutualism herbivory Fleas (1) feed on the blood of cats (2). Unicellular algae (1) live inside cells of corals (2), parasitsm predation Black rat snakes (1) eat rats (2) House sparrows (1) house finches (2) require similar food and nest sites.

Answer 1

	Effect of species 1	Effect of species 2	Type of interaction
Caterpillar eat passion flower leaves	+	-	Herbivory
Weeds grow among tomato plants	-	-	Competition
Honeybees pollinate daisies	+	+	Mutualism
Flees feed on the blood of cats	+	-	Parasitism
Unicellular algae lives inside coral reef	+	+	Mutualism
Black rat snakes eat rats	+	-	Parasitism
House sparrows house finches require food and nest site	-	-	Competition

Types of interactions in a community

type of interaction	sign	effects
mutualism	+/+	both species benefit from interaction
commensalism	+/0	one species benefits, one unaffected
competition	-/-	each species affected negatively
predation, parasitism, herbivory	+/-	one species benefits, one is disadvantaged