If we ask enough questions about a difficult assignment, we can get the teacher to make it easier and less demanding.
There is one "right answer" to any question, and it is in the book to be read.
If I memorize enough stuff, I can get a good grade.
The teacher "teaches" and the students "sit and listen" or learn passively.
If we wait long enough, a teacher will answer her own question, so we won't have to do much work.
The answer to most questions can be given in one or two words, and no one will challenge you to go deeper.