The defense mechanism in which selfjustifying explanations replace the real, unconscious reasons for actions is

The defense mechanism in which self-justifying explanations replace the real, unconscious reasons for actions is "rationalization".

Rationalization refers to a defense mechanism that includes the support of an unsuitable conduct, thought or feeling in an intelligent way, maintaining a strategic distance from the genuine purpose behind the activity. This protective move is regularly called “making excuses.”

Individuals who rationalize know in some way or another (cognizant or oblivious) that they have accomplished something hasty or less than ideal and hence come up with a reason (or numerous reasons) for why they felt or carried on as they did. Frequently, defense is utilized to stay away from sentiments of uneasiness, blame or other negative feelings. It might likewise be utilized to ensure one's confidence or self-idea.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.