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Which one of the following is most appropriately defined?
A
Host is an organism which provides food to another organism
B
Amensalism is a relationship in which one species is benefited whereas the other is unaffected
C
Predator is an organism that catches and kills other organism for food
D
Parasite is an organism which always lives inside the body of other organism and may kill it
Detailed Solution
A predator is an organism that captures, kills and eats another organism (its prey) for food; this definition is appropriate.
'Host' is used specifically for the organism that harbours a parasite; merely providing food does not define it (a prey or a producer also provides food).
In amensalism one species is harmed and the other is unaffected; the relationship in which one is benefited and the other unaffected is commensalism.
Parasites do not always live inside the host: ectoparasites such as lice and ticks live on the surface.
Hence the most appropriately defined term is predator.
'Host' is used specifically for the organism that harbours a parasite; merely providing food does not define it (a prey or a producer also provides food).
In amensalism one species is harmed and the other is unaffected; the relationship in which one is benefited and the other unaffected is commensalism.
Parasites do not always live inside the host: ectoparasites such as lice and ticks live on the surface.
Hence the most appropriately defined term is predator.