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Which one is the correct interaction sign for Commensalism?

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Which one is the correct interaction sign for Commensalism?

(a) +/+

(b) 0/0

(c) +/0

(d) 0/-

I have been asked this question during an online interview.

This is a very interesting question from Major Classes of Interactions in Mixed Cultures in chapter Mixed Cultures & Traditional Industrial Bioprocesses of Bioprocess Engineering

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Best answer
Right choice is (c) +/0

Best explanation: Type of Interaction Sign Effects Mutualism +/+ both species benefit from interaction Obligate Mutualism +/+ obligatory; both populations benefit Commensalism +/0 one species benefits, one unaffected Neutralism 0/0 populations do not affect one another Amensalism 0/- One species is disadvantaged/one species unaffected.

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