My wife and I have done this several times lately. She usually begins by asking the children how many of them saw the "Bee Movie." This generates lots of interest...then she tells the boys and girls how important bees and pollination are to our environment. She asks, "You like apples, strawberries, watermelon?" And then explains that pollination by the bees helps to make these foods so good to eat. Then I don my bee suit and show them a nuc hive (less bees) and the tools a beekeeper uses. If you have some honey straws and the teacher permits it...you can offer some honey for the boys and girls to sample. (But that does cost money...so up to you as to if you want to invest in that) All this seems to work really well for us and we let the kids ask questions along the way. They seem to really come up with some good ones. I am convinced that this is a most worthwhile endeavor.
"My child, eat honey, for it is good." (Proverbs 24:13)