A black walnut (Juglans nigra) emits a chemical that may kill or inhibit the growth of other nearby shrubs or trees. However, the black walnut is unaffected by this interaction. This is an example of which symbiotic relationship?

Amensalism

Explanation:

Amensalism is a form of relationship between organisms living in the same environment in which one is negatively affected, by inhibition or outright destruction, and the other is unaffected in any way.

Amensalism is of two types;

Competition: a relationship between two organisms which can be the same or different species in which one of the organisms deprive the other the necessary resources to survive in the environment, leading to inhibited growth or destruction. Antibiosis: A relationship between organisms of different species in which one produce chemicals that kills or inhibits the growth of the other.

Hence, the relationship between black walnut and nearby shrubs or trees is antibiosis, a form of amensalism.