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Question

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

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