If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to
A
parasitism
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B
mutualism
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C
amensalism
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D
commensalism
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Solution
The correct option is A parasitism Parasitism is a relationship between two living organisms of different species in which one organism, i.e. parasite obtains its food directly from the host. In this relationship the parasite is benefitted (+) and the host is harmed (-). So, this type of population interaction is represented by '+' '-'. Parasitism + , – Mutualism + , + Amensalism 0, – Commensalism +, 0