If + sign is assigned to beneficial interaction - sig

If + sign is assigned to beneficial interaction  -  sig
| 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. Commensalism

B. Parasitism

C. Mutualism

D. Ammensalism

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Parasitism is a non-mutual relationship between species, where one species, the parasite, benefits at the expense of the other, the host. 
So if '+" is assigned to beneficial interaction '-' sign to detrimental and '0" sign to neutral interaction, then the population interaction represented by "+". "-" refers to parasitism.