Acategory of motivation which compels a person to engage in a behavior because the behavior is rewarding for its own sake is called . a category of motivation which compels a person to engage in a behavior for an external reward is called .

The correct answers are:

1. Intrinsic motivation for the first question 
2. Extrinsic motivation for the second question

Intrinsic motivation refers to motivation that arises from factors within a person, rather than from external factors or rewards. An example of intrinsic motivation is when you study with dedication for an exam for "your own sake"- perhaps, it is important and personally rewarding for you to do well on the exam, which is why you are motivated to study. 

Extrinsic motivation on the other hand refers to motivation that arises from external factors or rewards, rather than factors internal to a person. An example of extrinsic motivation is when you study hard for an exam because your parents promised you a new cell phone if you get an 'A'. In this instance, your motivation to study and perform well on an exam is externally rather than internally driven.