Which is correct about amensalism?

One species is harmed and other is unaffected.

The correct answer is Option (1) → One species is harmed and other is unaffected.

Interspecific interactions arise from the interaction of populations of two different species. They could be beneficial, detrimental or neutral (neither harm nor benefit) to one of the species or both. Assigning a ‘+’ sign for beneficial interaction, ‘-’ sign for detrimental and 0 for neutral interaction.

In amensalism one species is harmed whereas the other is unaffected.