Short answer: No.
For the reasoning, read on.
A few zyBooks have end-of-section exercises, intended for students to do offline and submit in some other manner (like on paper, or uploaded to an LMS). Only a few zyBooks have those. zyBooks are created from scratch for the web, and thus some features differ from traditional textbooks, in an effort to improve the learning experience. One such difference is that instead of traditional end-of-section exercises that instructors choose from for homework problems, most zyBooks have over 1000 learning question "Participation Activities" embedded throughout the content, and include auto-generated "Challenge Activities" to serve as traditional homework problems (dozens of such activities, each with multiple levels, thus yielding several hundred problems). For many instructors, those activities, plus some custom homework problems created by the instructor, serve as a strong approach.
However, some zyBooks include additional end-of-section exercises to choose from for homework problems, especially for exercises that are hard to auto-grade, such as proofs. As we seek to serve our instructors and students, we invested in creating a full set of end-of-section exercises for some of our materials, similar to a traditional textbook. We also decided to provide these additional exercises for free, and did not increase the zyBook's price. Those end-of-section exercises are intended to be used as in a traditional textbook.
A key improvement over the traditional approach is:
- Rather than an instructor having to copy-paste solutions and somehow providing those solutions to students, in the zyBook the instructor can simply click the exercise's solution visibility icon to expose the solution. This not only saves instructor time/effort, but the solution's placement is better for the student's learning as well.
The above context is important to understanding the usage of end-of-section exercises by those instructors who do not create their own homework problems. Note, for example, that the zyBook does not have a mechanism for uploading student solutions; the zyBook is not a learning management system (LMS). And of course, the zyBook does not auto-grade those exercises.
Likewise, the above context is important for understanding how the solutions are intended to be used. Solutions are intended to be exposed for exercises that the instructor assigned as homework. Of course, instructors have some leeway in exposing a few more exercises if they wish to provide more examples for students. However, we do not expect instructors to expose all the solutions of a section and certainly not of the entire book, just as any publisher does not expect an instructor to hand out copies of the instructor's solution manual to students. When students purchase a traditional textbook, they are not entitled to access the instructor's solution manual. Therefore, we do not have a button that causes all solutions of a section to be revealed, since we do not expect instructors to reveal all solutions.
And, as a final note, we ultimately hope that, with continued development, the Participation Activities and the Challenge Activities will someday replace the need for such end-of-section exercises entirely. Such activities provide a more modern, learner-centric approach to providing students with opportunities for formative assessment. We hope to spend more efforts on developing more such activities, while also supporting instructors' wishes for traditional exercises.