Alternate the Colors on the Spreadsheet of Responses
The answer is always a spreadsheet I like to say! One of my favorite things about Google Forms is it goes to a spreadsheet. Click on the Responses tab in the Google Form to click on the green Sheets icon to create the spreadsheet.
Click the Eyeball
I suggest after you create a Google Form for formative assessment that the first thing you do is fill out the Form with the answer key. BEFORE students take it! This ensures that line 2 of the spreadsheet is the answer key.