Did you have to read that twice?
Point being I try to make things like this as anxiety-free as I can. One thing that's fun to do is give a pop quiz in the form of a card. Below is an example of a vitamin pop quiz I gave. I made little quiz-cards, placed them in envelopes, sealed them with veggie stickers (unnecessary but added to the fun! Thank you Target dollar bins), then popped them into their folders with a "Do Not Open" note written on them.
Was it more work than just handing out a quiz the old-fashioned way? Yes. Was it a little cutesy? Yes. Did the kids like it? Yes. Were they freaked out about taking a quiz? No.
Would I have done this for multiple large classes? Heck no, unless I had student helpers - this would be a great thing for student helpers to do, by the way. But, for just a couple of classes, it was totally worth it, and made learning about vitamins just a touch more fun.
p.s. Want more vitamin fun? Check out my completely ridiculous yet useful Vitamin Poem!