What is extended response?
Hi! I am unfamiliar with the term extended response. Our district does open response questions. Open response means you have to write or sometimes in 1st grade draw an answer to a question (as opposed to multiple choice or fill in the blank type questions). For example, our last open response question was with the book Rainbow fish. Students were asked to draw (and write if they could) a picture to show what happens at the beginning, middle, and end of the story. They are then scored on a zero through 4 rubric scale.
I also do these in Science a lot. I will give a unit test and the open response question at the end will require some kind of writing. When I was in school they were called essay questions.
If this is what you mean let me know and I will offer my suggestions for teaching how to answer open response.