Read the definition of various relationships between the different types of biotic components in an ecosystem, use them to correctly identify the relationships shown in the examples below.
RELATIONSHIPS BETWEEN ORGANISMS IN AN ECOSYSTEM
Predation: A detrimental relationship in which one
organism kills and eats another one
Allelopathy: A detrimental relationship in which one plant reduces the growth of another one in its vicinity by secreting inhibitory chemicals
Parasitism: A relationship in which one organism uses
another organism (the host) as its food source.
The host is adversely affected but does not usually die.
Mutualism: A necessary beneficial relationship between two organisms; both need each other for survival.
Commensalism: A relationship between two organisms in which one benefit; neither are harmed
A) A lichen is composed of an algae and a fungi living together. The algae provide food for itself and the fungus by photosynthesizing, and the fungus stores necessary water for both organisms.
B) A remora fish attaches itself to a shark as a means of transport. It also eats any food remains dropped by the shark.
C) Epiphytic ferns attach themselves to the trunks of large rainforest trees as a means of support.
D) A tapeworm feeds on digested food in the human intestine.
E) The rhizobium bacteria lives in the root nodules of legume plants. Rhizobium obtains food from the plant, while at the same time converting nitrogen from the air into nitrates that can be used by the plant.
F) Many eucalypt species produce toxic chemicals that inhibit the growth of seedlings of other species underneath their canopies.
G) Wildebeest calves in Africa are killed and eaten by hyenas.
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