I believe students should go on field trips. I LOVE them and they are great to expose students to different experiences that they may not get to experience other ways.
I was sitting with a small group at my back table today and going over analogies. This one made me realize these kids missed the field trip to the farm at some point.
Yes, they thought that corn is grown on a cob and peas are grown... in a can? It was a fun discussion and in the end they did realize peas come in pods before they come in cans. :) Just another teachable moment in 4th grade.