In our classification scheme, what is the effect of microbe B on microbe A?

Question

BlackTom AI · Accepted Answer

A positive sign (+) indicates that microbe B benefits microbe A — that is, B increases A’s growth, survival, reproduction, or fitness. In standard interaction-classification schemes the three symbols mean: + (positive/beneficial effect), − (negative/harmful effect), and 0 (neutral/no measurable effect).

Step-by-step reasoning:
1. Define the coding: + = B provides a net benefit to A (e.g., supplies nutrients, detoxifies the environment, or otherwise enhances A’s growth rate or abundance). − = B imposes a net cost on A (e.g., competition, predation, inhibition). 0 = B causes no detectable change in A’s performance.
2. Evaluate the reported effect for B on A as given in the scheme: the scheme marks the impact of B on A as beneficial. That directly corresponds to the “+” category by the coding defined above.
3. Map that observation to the answer choices: the only choice that matches “beneficial effect” is “+”.

Why “+” is correct:
- The classification explicitly uses “+” to represent an increase in fitness/growth/abundance of A due to B’s presence or activity. Any documented mechanism (cross-feeding, provision of growth factors, removal of toxic metabolites, niche modification) that results in improved performance of A falls under this symbol.

Why the other options are incorrect:
- “−” would indicate B harms A (reduces growth or survival); that contradicts the scheme’s indicated beneficial effect.
- “0” would indicate no detectable effect of B on A; that contradicts the explicitly beneficial effect recorded.

Conclusion: According to the classification definitions and the indicated beneficial effect of B on A, the correct designation is “+”, which matches the provided answer.

In our classification scheme, what is the effect of microbe B on microbe A?单项选择题

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