Pedagogy of the book and chapter questions

Does the organization of the textbook relate to pedagogical approaches used to teach with it? I considered this question in relation to chapter organization in a previous post. In this post I will explore another part of the typical textbook chapter: questions.

Flip to the end of a textbook chapter, and you will usually find a list of questions, exercises, or other suggested assignments. Sometimes you will find additional learning activity ideas and resources on the companion website. Do they serve a purpose, or do readers flip past to get to the next assigned reading?